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California system directory

Find a community water system

Search every California community water system with a current nitrate result. Open a system to see its latest reading, reporting date, nitrate band and population served.

2,405
systems with a current result
42,591,451
people served by them
156
systems carrying a supplier result
340
systems at or above 5 mg/L
3
systems listed with older records
How to read the directory: each system is placed in a band by its most recent reported result in the rolling three-year window. Purchased-water systems carry their supplier's result and are tagged. Bands describe how strongly human activity, read from nitrate, has marked a water source; they are not a safety verdict. Also listed: 3 systems whose latest report predates the window, marked “no current result” - the dated record is on the system's own page, and it is counted in no figure here.
Filter by nitrate band
Showing 2,408 of 2,408 systems
0-9
City of 10,000 BuddhasHuman impact likely1.00 mg/LAug 2025400 served132 Investments Water SystemHuman impact likely1.90 mg/LMar 2026252 served148 East Water SystemHuman impact likely2.60 mg/LSep 202536 served15Th AvenueNatural background0.05 mg/LFeb 202650 served49Er Trailer RanchNatural background0.49 mg/LJan 2025115 served4N Mobilehome ParkHealth-study range5.10 mg/LFeb 202665 served60Th Street Assoc. Water SystemHuman impact likely1.40 mg/LAug 202539 served
A
A.F.P. Mutual Water CompanyNatural background0.82 mg/LOct 2025710 servedA1 Winstons Mobile Home ParkHealth-study range8.20 mg/LMay 202675 servedAaa Kindness Care HomeHealth-study range5.70 mg/LMay 202645 servedAbbey of New ClairvauxNatural background0.20 mg/LMar 202663 servedAberdeen Water SystemNatural background0.12 mg/LAug 202548 servedAborn Heights Water Mutual AssociationHuman impact clear4.80 mg/LApr 202645 servedAbrams Lake Mobile EstatesHuman impact likely1.10 mg/LAug 2025135 servedAcampo Water SystemHuman impact likely1.00 mg/LFeb 2026231 servedAda'S LodgesHealth-study range7.90 mg/LJun 202625 servedCity of AdelantoNatural background0.58 mg/LAug 202539,930 servedAdventist Health - St. Helena HospitalHuman impact likely1.40 mg/LMar 2026817 servedAerial Acres Water Company, Inc.Human impact clear3.40 mg/LNov 202387 servedAfuera De Chorro Water CompanyHuman impact likely1.40 mg/LFeb 202679 servedAgape Mutual Water SystemHuman impact clear3.20 mg/LMay 202650 servedAgbayani Village Water SystemHealth-study range7.00 mg/LApr 202638 servedAlameda County Water DistrictNatural background0.55 mg/LMay 2026344,000 servedAlameda Pointpurchased waterNatural background0.20 mg/LMay 20261,400 servedAlbion Mutual Water CompanyNatural background0.20 mg/LAug 202556 servedAlco Water ServiceHuman impact clear3.60 mg/LMay 202656,253 servedAldercroft Heights County Water DistrictNatural background0.20 mg/LJan 2026338 servedAlegria Domestic Mutual Water CompanyNatural background0.20 mg/LMay 202654 servedAlexander Valley Acres Water CompanyNatural background0.94 mg/LJun 202527 servedCity of AlhambraHealth-study range6.60 mg/LMay 202679,776 servedAllan Lane Water AssociationHuman impact likely1.10 mg/LApr 202654 servedAlleghany County W.D.Natural background0.20 mg/LSep 202582 servedAllen Road Mutual Water SystemNatural background0.37 mg/LAug 2025195 servedAlliance Redwoods Conference GroundsNatural background0.20 mg/LJun 2025418 servedAlmira Water AssociationNatural background0.20 mg/LMay 202640 servedAlmond Grove Mobile ParkHealth-study range9.20 mg/LApr 2026253 servedAlmond Park Water SystemHuman impact likely1.40 mg/LFeb 202660 servedAlpaugh Community Services DistrictNatural background0.12 mg/LApr 2026871 servedAlpine Acres Mutual Water CoHuman impact likely2.80 mg/LDec 2025195 servedAlpine Meadows Property Owners AssoNatural background0.20 mg/LMar 2025250 servedAlpine Oaks Estates LlcHealth-study range6.90 mg/LApr 2024185 servedAlpine Springs County Water DistrictNatural background0.07 mg/LSep 20252,200 servedAlpine VillageNatural background0.44 mg/LJan 2026198 servedAlpine Water Users AssociationHuman impact likely1.70 mg/LJul 20252,534 servedAlta Sierra Mutual Water Co.Natural background0.12 mg/LNov 2025143 servedCity of AlturasHealth-study range5.89 mg/LMay 20252,715 servedAlturas Fillmore MhpHuman impact likely2.80 mg/LJul 202599 servedAmarillo Mutual Water CompanyHuman impact clear4.80 mg/LDec 20253,134 servedCity of American CanyonNatural background0.20 mg/LJan 202621,437 servedAmerican Valley CsdNatural background0.82 mg/LJun 20253,778 servedAmerican Water O&M, Llc - VsfbNatural background0.20 mg/LJan 202614,971 servedAmezcua - Garcia WaterNatural background0.57 mg/LJan 2026316 servedCity of AnaheimHuman impact likely1.60 mg/LApr 2026348,593 servedAnanda VillageHuman impact likely1.17 mg/LFeb 2026222 servedCity of AndersonHuman impact likely1.80 mg/LMay 202611,147 servedAnderson Springs CsdNatural background0.20 mg/LJun 2025373 servedAngelo Lane Water CompanyNatural background0.78 mg/LDec 202541 servedAngels Camp Rv/Camping ResortHealth-study range6.40 mg/LNov 2025288 servedAngler S Ranch #3Natural background0.20 mg/LJun 202560 servedAnglers Subdivision 4Natural background0.20 mg/LAug 202599 servedAntelope Creek MhpHuman impact likely1.10 mg/LApr 2026175 servedAntelope Park Mutual Water CompanyNatural background0.50 mg/LApr 2026445 servedAntelope Valley E Kern Wtr Agy-RosamondHuman impact likely1.60 mg/LOct 20240 servedAntelope Valley East Kern Water AgencyNatural background0.17 mg/LNov 20250 servedAntelope Valley Mobile EstatesHuman impact likely1.70 mg/LOct 202560 servedCity of AntiochNatural background0.34 mg/LMar 2026115,074 servedAntoinette Mutual Water CoHealth-study range7.42 mg/LFeb 202625 servedAnza Mutual Water CompanyHealth-study range6.40 mg/LApr 2026224 servedAnza Pines Mobile Home ParkHealth-study range6.20 mg/LApr 202690 servedAnza Rv ResortHuman impact likely1.30 mg/LMar 2026203 servedAnza Vineyard Estates Mutual Water CoHuman impact likely1.30 mg/LApr 202660 servedApple Ave Ws #02Natural background0.10 mg/LFeb 202675 servedApple Valley Foothill CwdHuman impact likely1.50 mg/LMay 2026811 servedApple Valley Heights CwdNatural background0.73 mg/LApr 2026983 servedApple Valley View MwcHuman impact likely2.50 mg/LMar 2026303 servedApple Valley Village MheHuman impact likely1.20 mg/LDec 2025180 servedApricot Ln WsNatural background0.70 mg/LSep 202553 servedAptos Hills Mutual Water CoHealth-study range5.00 mg/LJan 202632 servedAptos Ridge Mutual Water CoHuman impact clear4.30 mg/LSep 202552 servedAqua J. Mutual Water CompanyNatural background0.60 mg/LMar 2026158 servedArbor Mobile Home Park WsHuman impact likely1.40 mg/LAug 2025340 servedArbuckle Public Utility DistrictHealth-study range5.64 mg/LDec 20252,778 servedCity of ArcadiaHuman impact likely1.90 mg/LJun 202651,361 servedArlington Heights MhpNatural background0.10 mg/LJun 202533 servedArmona Community Services DistNatural background0.12 mg/LJan 20264,143 servedArmstrong Valley-Cal Water Service (Puc)Natural background0.20 mg/LJun 2025473 servedAromas Water DistrictNatural background0.40 mg/LDec 20252,988 servedArrowbear Park CwdNatural background0.20 mg/LJan 20261,856 servedArrowhead Villas Mutual Service CompanyNatural background0.20 mg/LMay 20242,654 servedArroyo Center WcNatural background0.05 mg/LJan 2026130 servedCity of Arroyo Grande Utilities DivisionHuman impact clear4.30 mg/LApr 202617,963 servedArroyo Seco Estates MwsNatural background0.50 mg/LJan 202670 servedArtois Community S.D.Human impact clear4.20 mg/LMar 2026254 servedArvin Community Services DistHuman impact likely1.00 mg/LApr 202619,669 servedAshford Highlands MwcHuman impact clear3.20 mg/LJun 2025132 servedAsoleado MwcNatural background0.05 mg/LMar 2026101 servedAspendell Mutual Water CompanyNatural background0.12 mg/LSep 202560 servedAssisi MwcNatural background0.80 mg/LFeb 2026126 servedAtascadero Mutual Water CoHuman impact clear3.80 mg/LMar 202430,618 servedAtascadero State HospitalHuman impact likely1.20 mg/LApr 20254,100 servedAthena Terrace Mutual Water CompanyNatural background0.20 mg/LApr 202650 servedCity of AtwaterHuman impact clear3.90 mg/LMay 202629,479 servedAuburn Ridge WoodsNatural background0.20 mg/LAug 202575 servedAuburn Valley Community Service DisNatural background0.20 mg/LMar 2025290 servedAustin Acres Mutual Water CompanyNatural background0.20 mg/LApr 202582 servedAustin Creek Mutual (Springhill)Natural background0.20 mg/LMar 2026150 servedCity of AvenalNatural background0.12 mg/LOct 202513,696 servedAverydale MwcNatural background0.55 mg/LFeb 20261,023 servedAvila Beach Community Services Districtpurchased waterNatural background0.20 mg/LMay 20261,630 servedAvila Valley Mutual Water CoNatural background0.20 mg/LApr 202675 servedAwa - Camanche VillageHuman impact likely2.90 mg/LJun 20252,402 servedAzusa Light And WaterNatural background0.49 mg/LMay 2026110,044 served
B
B & W Resort MarinaNatural background0.20 mg/LNov 2025100 servedB&G Mobile Home Park Llc WsHuman impact likely1.00 mg/LOct 202550 servedBaker Community Services DistrictHuman impact clear3.60 mg/LMar 20261,000 servedBaker Ranch Water CorpNatural background0.20 mg/LFeb 2026150 servedCity of BakersfieldHuman impact likely2.40 mg/LMay 2026160,144 servedBakman Water CompanyHealth-study range5.70 mg/LApr 202617,393 servedBaldy Mountain RanchHuman impact clear4.10 mg/LMar 202680 servedBallico CsdHealth-study range7.91 mg/LApr 2026238 servedCity of BanningHuman impact likely1.40 mg/LMar 202631,680 servedBanning Hts. Mutual Water Co.Human impact clear4.20 mg/LAug 2025567 servedBar "H" MwcAbove the federal limit13.00 mg/LMar 2026260 servedBar-Len MwcHuman impact likely1.30 mg/LSep 2025126 servedBaron Canyon Mutual Water Co.Natural background0.20 mg/LOct 202581 servedBarrett Lake Mh And Rv LlcHuman impact likely2.30 mg/LJun 2026300 servedBass Lake Annex 3Human impact likely1.10 mg/LMar 202542 servedBass Lake Heights Mutual WaterHuman impact likely1.80 mg/LSep 2025250 servedBassi Ranch Mutual Water Co.Natural background0.20 mg/LOct 202585 servedBaumann Rd Ws #01Natural background0.60 mg/LJan 202548 servedBautista Cc No. 36Natural background0.20 mg/LOct 202373 servedBaycliff WaterHuman impact likely1.00 mg/LJul 202570 servedBdvwa - Goat Mountain IdHuman impact likely1.30 mg/LFeb 20261,118 servedBeale Air Force BaseHuman impact likely1.35 mg/LDec 20256,785 servedBear State Water WorksNatural background0.20 mg/LSep 2025100 servedBear Valley CsdHealth-study range5.40 mg/LApr 20265,592 servedBear Valley MhpNatural background0.20 mg/LJan 2026150 servedBear Valley Water CompanyHuman impact likely1.60 mg/LOct 202545 servedBeaumont Cherry Valley WdHuman impact clear3.60 mg/LMay 202666,841 servedBedel Mutual Water CompanyHuman impact likely1.60 mg/LJan 2025155 servedBel Air Mobile EstateHealth-study range6.90 mg/LMay 2026325 servedCity of Bell GardensHuman impact likely1.40 mg/LJan 202611,437 servedBella Lago Mobile Home Parkno current resultlast Jul 2023152 servedBella Shores Mobile Home ParkNatural background0.20 mg/LMar 202680 servedBella Vista Mutual Water CompanyHuman impact clear3.80 mg/LAug 2025150 servedBella Vista Water DistrictNatural background0.12 mg/LAug 202518,612 servedBelleview Oaks Mutual Water CoHuman impact likely1.72 mg/LFeb 2025468 servedBellflower - Somerset MwcHuman impact likely1.80 mg/LOct 202546,300 servedBellflower Home Garden Water Companypurchased waterHuman impact likely1.80 mg/LOct 20251,129 servedBellflower Municipal Water SystemNatural background0.96 mg/LFeb 20265,999 servedBelmont Terrace Mutual Water CompanyHealth-study range7.40 mg/LMar 2026287 servedBelmont Water CorporationHuman impact likely2.90 mg/LApr 2026264 servedBend Mobilehome & Rv ParkNatural background0.90 mg/LJan 202699 servedCity of BeniciaNatural background0.11 mg/LDec 202527,131 servedBennett Ridge Mutual Water CompanyNatural background0.20 mg/LMar 2026439 servedBerry Creek Community Service DistNatural background0.50 mg/LNov 202528 servedBerry Dr Ws #02Human impact likely1.70 mg/LMar 202640 servedBertsch Ocean View Csdpurchased waterHuman impact likely1.80 mg/LJul 20252,570 servedBetabel Rv ResortHuman impact likely1.30 mg/LMay 202649 servedBethel Island EstatesNatural background0.20 mg/LJul 2025200 servedBethel Island MhcNatural background0.20 mg/LJul 2025185 servedBethel Island Mutual Water CoNatural background0.20 mg/LAug 2025123 servedBeverly Hills-City, Water Dept.Natural background0.20 mg/LNov 202540,121 servedBianchi Flowers IncNatural background0.05 mg/LAug 202565 servedBig Basin Water CompanyNatural background0.05 mg/LAug 20231,120 servedBig Bear City CsdHuman impact likely1.10 mg/LJun 202612,738 servedBig Bear Lake Dwp - Big Bear SystemNatural background0.70 mg/LOct 202526,132 servedBig Creek Community Serv DistNatural background0.20 mg/LJan 202672 servedBig Lagoon CsdNatural background0.70 mg/LFeb 2026112 servedBig Oak Mobile Home Park WaterHealth-study range7.30 mg/LSep 2025156 servedBig Pine Csdpurchased waterNatural background0.93 mg/LMay 2025792 servedBig Pine TractNatural background0.20 mg/LFeb 2026300 servedBig Redwood Park Waterpurchased waterNatural background0.20 mg/LMar 2026182 servedBig River Vista Mutual Water CompanyNatural background0.20 mg/LJun 202436 servedBig Rock C.S.D.Natural background0.05 mg/LJun 2025650 servedBig Springs Mutual Water SystemNatural background0.05 mg/LApr 202697 servedBig Wheel Mobile Home ParkHealth-study range7.10 mg/LMay 2026120 servedBiggers Glen Mutual Water CoNatural background0.20 mg/LApr 202656 servedCity of BiggsHuman impact likely1.18 mg/LDec 20252,060 servedBighorn - Desert View Water AgencyHuman impact likely2.10 mg/LMay 20263,916 servedBirchim Community Service DistrictNatural background0.10 mg/LAug 2025150 servedCity of BishopNatural background0.27 mg/LJun 20253,819 servedBlack Rascal Water CompanyHealth-study range7.10 mg/LApr 2026367 servedBlackie Rd Ws #05Human impact likely2.20 mg/LMay 202678 servedBlairsden Water Users AssnNatural background0.20 mg/LJul 2025200 servedBleich Flats MutualHuman impact likely1.70 mg/LOct 202442 servedBlue Lakes Improvement ClubNatural background0.49 mg/LSep 202590 servedBlue Lakes Mobile Home ParkNatural background0.20 mg/LSep 202532 servedBlue Lakes VillageNatural background0.52 mg/LDec 202565 servedBlue Mountain CenterNatural background0.20 mg/LMar 202635 servedBlue Oak Terrace MutualNatural background0.20 mg/LMar 202681 servedBlue Skies Trailor ParkNatural background0.20 mg/LJun 202556 servedBlue Spruce Mobile Home ParkNatural background0.20 mg/LJan 202690 servedBluebell Valley MwcHuman impact clear4.50 mg/LApr 2026282 servedBluffs WsNatural background0.20 mg/LJan 2026120 servedCity of Blythe -Natural background0.10 mg/LNov 20259,798 servedBlythe - Hidden BeachesNatural background0.10 mg/LNov 2025393 servedBlythe - Mesa RanchNatural background0.52 mg/LNov 2025558 servedBlythe Mobile Home EstatesNatural background0.20 mg/LMay 202635 servedBobcat Springs Mutual Water CompanyHuman impact likely1.40 mg/LFeb 2026115 servedBodega Bay Public Utility DistrictNatural background0.20 mg/LApr 20261,069 servedBodega Water CompanyNatural background0.20 mg/LApr 202677 servedBolinas Community PudNatural background0.65 mg/LDec 20232,483 servedBonadelle Ranchos No. 2 Mutual Water CoHuman impact likely1.80 mg/LOct 2025142 servedBonfire Village HotelAbove the federal limit24.00 mg/LApr 202644 servedBoron Csdpurchased waterHuman impact likely1.60 mg/LOct 20242,086 servedBorrego WdHuman impact likely1.10 mg/LApr 20263,429 servedBoulevard Heights Mutual WaterNatural background0.20 mg/LFeb 202660 servedBox Springs Mutual WcHealth-study range8.20 mg/LMay 20263,382 servedBracken Brae Country Clubpurchased waterNatural background0.03 mg/LMay 202552 servedBradford Run RvHealth-study range8.00 mg/LMay 202675 servedBradley-Lockwood Rd WsHuman impact likely2.50 mg/LMay 202625 servedBrand Water CompanyNatural background0.20 mg/LNov 2025112 servedBrandeis Bardin Institutepurchased waterNatural background0.20 mg/LJan 2026665 servedBrandon Creek MwsNatural background0.05 mg/LOct 202541 servedBranger Mutual Water Company, Inc.Natural background0.43 mg/LMay 2026300 servedCity of BrawleyNatural background0.20 mg/LApr 202626,862 servedCity of Breapurchased waterHealth-study range5.80 mg/LMay 202648,479 servedBreese Subdivision 2Health-study range5.10 mg/LJun 202575 servedBrentwoodHuman impact likely2.80 mg/LDec 202564,513 servedBridgehaven ParkNatural background0.20 mg/LOct 202570 servedBridgeport PudNatural background0.22 mg/LMar 2026524 servedCity of Brisbanepurchased waterNatural background0.42 mg/LJun 20253,402 servedBrite Lake Mutual Water CompanyHuman impact likely2.80 mg/LApr 202689 servedBroadview Terrace Mutual Water CompanyHealth-study range7.70 mg/LMay 2024498 servedBrookside Estates Mutual Water CompanyNatural background0.12 mg/LApr 202459 servedBrookside MhpNatural background0.85 mg/LDec 202565 servedBrookside Mobile Home ParkHuman impact likely1.90 mg/LSep 2025126 servedBrush And Old Well Mutual Water Companypurchased waterNatural background0.20 mg/LMar 202670 servedBucktail Mutual Water CompanyNatural background0.14 mg/LJan 202642 servedBuehner HousesHuman impact likely1.70 mg/LMay 202625 servedBuehner Water SystemNatural background0.20 mg/LMar 2026150 servedCity of Buellton Water DivisionNatural background0.51 mg/LSep 20255,161 servedCity of Buena ParkHuman impact likely1.45 mg/LMar 202681,998 servedBuena Vista Migrant CenterNatural background0.90 mg/LFeb 2026455 servedBurbank-City, Water Dept.Human impact clear3.70 mg/LJun 2026105,603 servedBurchell Road Water AssociationNatural background0.93 mg/LJan 202665 servedBurlando Heights Mutual Water Co.Health-study range7.60 mg/LApr 202644 servedCity of Burlingamepurchased waterAbove the federal limit11.40 mg/LJul 202531,451 servedBurney Water DistrictNatural background0.11 mg/LMar 20263,154 servedButano Canyon MutualNatural background0.05 mg/LNov 2023150 servedButte City Community S.D.Natural background0.90 mg/LMay 202675 servedButte Court Mobile Home ParkHuman impact clear4.10 mg/LMay 202565 servedButte Creek Estates Mutual Water CoNatural background0.20 mg/LFeb 2026399 servedButterfield RanchNatural background0.20 mg/LApr 2026353 served
C
Cabana Holiday WsHuman impact likely2.20 mg/LNov 2025506 servedCabazon Water DistrictHuman impact likely2.30 mg/LMay 20262,010 servedCachagua Mutual Ws (#4)Natural background0.30 mg/LMar 202655 servedCacheville Service DistHuman impact likely1.90 mg/LFeb 2026239 servedCachuma Projectpurchased waterNatural background0.05 mg/LApr 20260 servedCachuma VillageNatural background0.20 mg/LAug 202560 servedCal Am - AntelopeHuman impact likely1.00 mg/LMay 202635,534 servedCal Am - ArdenHuman impact clear3.88 mg/LJul 20254,191 servedCal Am - Bass LakeNatural background0.10 mg/LApr 20264,527 servedCal Am - DunniganHuman impact clear3.50 mg/LMay 2026602 servedCal Am - Fruitridge VistaNatural background0.01 mg/LAug 202315,652 servedCal Am - GoldsideNatural background0.77 mg/LApr 20261,043 servedCal Am - IsletonNatural background0.01 mg/LMar 20241,693 servedCal Am - Lincoln OaksHuman impact likely2.03 mg/LMay 202648,094 servedCal Am - MeadowbrookHealth-study range6.69 mg/LApr 20265,656 servedCal Am - OakhurstNatural background0.05 mg/LJul 20243,693 servedCal Am - ParkwayHuman impact clear3.90 mg/LMay 202650,573 servedCal Am - RaymondHuman impact clear3.94 mg/LMay 2026343 servedCal Am - Suburban RosemontNatural background0.01 mg/LApr 202654,793 servedCal Am - Walnut GroveNatural background0.01 mg/LMar 2024667 servedCal Am - West PlacerNatural background0.04 mg/LMar 20268,861 servedCal Am - West San MartinHealth-study range6.00 mg/LApr 20261,173 servedCal Am Water Company - Ambler ParkNatural background0.40 mg/LApr 2026980 servedCal Am Water Company - ChualarNatural background0.70 mg/LJan 20261,139 servedCal Am Water Company - GarrapataNatural background0.69 mg/LMar 202630 servedCal Am Water Company - MontereyHuman impact clear4.91 mg/LMay 202692,450 servedCal Am Water Company - Ralph LaneNatural background0.31 mg/LJan 202696 servedCal Am Water Company - ToroHuman impact likely2.00 mg/LJan 20261,065 servedCal American - Yerba BuenaNatural background0.20 mg/LJan 2026690 servedCal American Water Copurchased waterNatural background0.20 mg/LJan 202666,809 servedCal American Water Company - PiruHuman impact likely2.20 mg/LMay 20262,003 servedCal American Wc - Las Posas Estatespurchased waterNatural background0.20 mg/LJan 20262,039 servedCal American Wc - Rio PlazaHuman impact clear3.63 mg/LApr 20261,709 servedCal Fire - Mountain Home Cnsrvtn CampNatural background0.20 mg/LOct 2025123 servedCal Ore Mobile EstatesNatural background0.50 mg/LAug 2025146 servedCal-Am Water Company - DuarteHuman impact likely1.10 mg/LMay 202624,773 servedCal-Am Water Company - East PasadenaNatural background0.60 mg/LApr 20269,949 servedCal-Am Water Coronadopurchased waterNatural background0.20 mg/LMay 2026106,000 servedCal-Water Service Co.-ChicoHuman impact clear3.60 mg/LMay 2026114,925 servedCal-Water Service Co.-Hamilton CityHuman impact clear3.10 mg/LApr 20261,799 servedCal-Water Service Co.-MarysvilleNatural background0.20 mg/LMay 202612,419 servedCal-Water Service Co.-OrovilleNatural background0.20 mg/LApr 202611,106 servedCal-Water Service Co.-WillowsHuman impact likely2.10 mg/LApr 20267,240 servedCal/Am Water Company - Baldwin HillsHuman impact likely2.51 mg/LMay 202620,724 servedCal/Am Water Company - San MarinoHuman impact clear3.32 mg/LMay 202647,995 servedCalaveras PudNatural background0.20 mg/LApr 20266,286 servedCalera Canyon Heights HoaNatural background0.70 mg/LMar 202640 servedCity of CalexicoNatural background0.20 mg/LApr 202640,357 servedCali Lake Rv ResortNatural background0.20 mg/LJun 202599 servedCalico Lake HomeownersNatural background0.20 mg/LJan 2026150 servedCalif State Polytechnical Univ - PomonaHealth-study range5.60 mg/LJun 202629,854 servedCity of California CityHuman impact likely1.40 mg/LFeb 202614,198 servedCalifornia Conservation Camp #14Human impact likely1.43 mg/LFeb 2026107 servedCalifornia Domestic Water CompanyHealth-study range5.80 mg/LMay 20260 servedCalifornia Institution For MenHealth-study range5.40 mg/LJun 202610,667 servedCalifornia Institution For Womenpurchased waterHealth-study range5.40 mg/LJun 20261,195 servedCalifornia Orchard WsNatural background0.05 mg/LJun 2025150 servedCalifornia Pines C.S.D.Natural background0.05 mg/LFeb 2026862 servedCalifornia Rehabilitation Center - Norcopurchased waterNatural background0.20 mg/LNov 20254,300 servedCalifornia State FairNatural background0.21 mg/LDec 20259,280 servedCalifornia Water Service - Bear GulchHuman impact likely2.50 mg/LJul 202561,431 servedCalifornia Water Service - LivermoreHealth-study range7.00 mg/LMay 202660,414 servedCalifornia Water Service - San Carlospurchased waterNatural background0.42 mg/LJun 202535,344 servedCalifornia Water Service - San Mateopurchased waterNatural background0.42 mg/LJun 2025102,348 servedCalifornia Water Service - StocktonHealth-study range6.80 mg/LMay 2026176,266 servedCalifornia Water Service Co - WestlakeNatural background0.40 mg/LApr 202619,533 servedCalifornia Water Service Co-Lake HughesHuman impact clear4.70 mg/LApr 2026929 servedCalifornia Water Service Co-Leona ValleyHuman impact likely2.40 mg/LMay 2026878 servedCalifornia Water Service Co. - DixonHealth-study range6.80 mg/LMay 202610,623 servedCalifornia Water Service Co. - DominguezNatural background0.40 mg/LMay 2026143,996 servedCalifornia Water Service Co. - ElaHuman impact likely2.40 mg/LMay 2026152,474 servedCalifornia Water Service Co. - Herm/RedoNatural background0.40 mg/LMay 202696,853 servedCalifornia Water Service Co. - Palos VerNatural background0.40 mg/LMay 202671,452 servedCalifornia Water Service Co.-LancasterHuman impact likely2.30 mg/LJun 20251,387 servedCalifornia Water Service Co.-Travis AfbHuman impact likely1.90 mg/LApr 202618,111 servedCalifornia Water Service-S San FranciscoHuman impact likely1.30 mg/LMay 202664,146 servedCalifornia-American Geyserville (Puc)Human impact likely2.05 mg/LJun 20251,046 servedCalifornia-American Larkfield (Puc)Natural background0.01 mg/LJun 20247,913 servedCalifornian Mobile Home ParkHuman impact likely1.50 mg/LAug 2025372 servedCalipatria State Prisonpurchased waterNatural background0.20 mg/LApr 20264,800 servedCalistoga Farm Worker CenterNatural background0.20 mg/LMay 202665 servedCallayomi County Water DistrictNatural background0.20 mg/LFeb 20261,598 servedCalleguas Municipal Water DistNatural background0.20 mg/LJan 20260 servedCallender Grove Mutual WaterHealth-study range5.70 mg/LApr 2026126 servedCalpella County Water DistrictNatural background0.20 mg/LFeb 2026548 servedCamanche North Shore Inc.Natural background0.20 mg/LApr 2026922 servedCamanche South Shore-EbmudNatural background0.20 mg/LFeb 2026828 servedCamarillo Water DeptNatural background0.20 mg/LApr 202646,824 servedCambria Comm Services DistNatural background0.40 mg/LJul 20255,532 servedCamden Trailer ParkNatural background0.12 mg/LMay 202675 servedCamino MobilehomeNatural background0.20 mg/LSep 2025210 servedCamp Jones GulchNatural background0.05 mg/LDec 2025357 servedCamp Meeker Water SystemNatural background0.20 mg/LDec 20251,171 servedCamp Owen Water SystemHuman impact likely1.10 mg/LOct 2025110 servedCamp Pendleton (North)Natural background0.54 mg/LApr 202612,651 servedCamp Pendleton (South)Natural background0.40 mg/LApr 202642,219 servedCamp StevensNatural background0.20 mg/LMay 202678 servedCamp Waterman MwcHuman impact likely1.40 mg/LJan 202655 servedCamp Williams-Resort WaterNatural background0.20 mg/LMar 202680 servedCampers Inn - Rv & Golf CourseHealth-study range5.80 mg/LApr 2026140 servedCamphora ApartmentsNatural background0.30 mg/LJan 2026126 servedCampo Hills-County Public Works WastewtrHuman impact likely1.70 mg/LDec 2025500 servedCamptonville Community Serv DistNatural background0.20 mg/LMay 2026180 servedCamrosa Water DistrictHealth-study range5.60 mg/LJun 202632,700 servedCandlelight Village Mutual Water Co.Human impact likely1.80 mg/LApr 202675 servedCanon Manor Water SystemNatural background0.20 mg/LJun 2025805 servedCantua Creek Vineyards, Iv, Llc.Natural background0.50 mg/LJun 202552 servedCanyon Creek MhpHuman impact likely1.00 mg/LOct 202535 servedCanyon Crest Mutual Benefit Wcpurchased waterNatural background0.20 mg/LMay 2026133 servedCanyon Meadows Mutual WaterHuman impact likely2.10 mg/LMay 2026465 servedCapell Valley EstatesNatural background0.05 mg/LNov 2025208 servedCardoza Villa CorpNatural background0.20 mg/LJun 202630 servedCaribou Mobile Park PwsHuman impact clear4.90 mg/LApr 2026180 servedCarlsbad Desalination PlantNatural background0.05 mg/LApr 20260 servedCarlsbad Mwdpurchased waterNatural background0.46 mg/LMay 202695,158 servedCarmel Riviera MwcHuman impact likely2.80 mg/LDec 2025584 servedCarmet By The Sea Water CompanyNatural background0.20 mg/LDec 2025288 servedCarmichael Water DistrictNatural background0.12 mg/LMay 202541,193 servedCarpinteria Valley Water DistrictNatural background0.20 mg/LJun 202515,996 servedCartago Mutual Water CompanyNatural background0.12 mg/LSep 2024132 servedCaruthers Comm Serv DistNatural background0.69 mg/LJul 20252,613 servedCarver Tract Mutual Water CompNatural background0.98 mg/LJan 2026600 servedCasa De Amigos Manufactured Housing CommHuman impact likely2.00 mg/LMar 2025204 servedCasa De Fruta Water SystemHuman impact likely1.20 mg/LMay 2026250 servedCasa Dulce EstatesHuman impact likely1.40 mg/LJun 202524 servedCasa Medanos Water SystemHealth-study range5.20 mg/LJul 202545 servedCascade EstatesHealth-study range6.47 mg/LApr 2026316 servedCascadel Mutual Water SystemNatural background0.20 mg/LMar 2026137 servedCasitas Municipal Water DistNatural background0.80 mg/LJun 202611,005 servedCasitas Mutual Water CompanyHuman impact likely1.40 mg/LMay 2026238 servedCasmalia Community Services DistrictHuman impact likely1.40 mg/LApr 2024234 servedCastle AirportHealth-study range5.00 mg/LApr 20261,650 servedCastlewood Domestic Water Systempurchased waterHuman impact likely2.50 mg/LJun 2025524 servedCastlewood Mobile Home ParkNatural background0.12 mg/LJan 2026200 servedCathedral Hills Mwc, IncNatural background0.05 mg/LFeb 202660 servedCathedral Wood Mutual Water CompanyNatural background0.20 mg/LJun 202560 servedCayucos Beach Mutual Water CompanyNatural background0.56 mg/LMay 20262,567 servedCazadero Water Company, Inc. (Puc)Natural background0.20 mg/LDec 2025525 servedCci - TehachapiHuman impact clear4.90 mg/LJul 20252,993 servedCcwd - Copper CoveNatural background0.20 mg/LApr 20265,187 servedCcwd - Ebbetts PassNatural background0.20 mg/LApr 202611,545 servedCcwd - Jenny LindNatural background0.20 mg/LApr 20269,861 servedCcwd - Sheep RanchNatural background0.20 mg/LApr 202689 servedCcwd - West PointNatural background0.20 mg/LDec 20251,043 servedCcwd/Brentwood WtpNatural background0.49 mg/LJan 20260 servedCdcr California Health Care Facilitypurchased waterNatural background0.20 mg/LAug 20255,551 servedCdcr-High Desert State PrisonHuman impact likely1.10 mg/LApr 20263,857 servedCdf - Oak Glen Conservation CampHuman impact likely1.10 mg/LMar 202683 servedCdf - Owens Valley Conservation CampNatural background0.12 mg/LMay 202694 servedCdf - Pilot Rock Conservation CampNatural background0.12 mg/LFeb 202665 servedCdf-Konocti Conservation Camp No. 27Natural background0.20 mg/LDec 2024100 servedCedar LodgeNatural background0.68 mg/LDec 2024656 servedCedar Valley Mutual Water CoNatural background0.20 mg/LJan 2026137 servedCedarpines Park MwcHealth-study range6.40 mg/LMay 20262,458 servedCedarville County Water Dist.Human impact likely1.78 mg/LMay 2025600 servedCenter Water CoHuman impact likely1.20 mg/LMay 2025662 servedCenterville C.S.D.purchased waterNatural background0.40 mg/LJul 20254,151 servedCentinela State PrisonNatural background0.20 mg/LOct 20244,100 servedCentral Coast Water AuthorityNatural background0.08 mg/LOct 20250 servedCentury Mobile Home ParkNatural background0.20 mg/LSep 202550 servedCity of CeresHealth-study range6.24 mg/LMay 202654,513 servedCerritos - City, Water Dept.Natural background0.20 mg/LFeb 202647,475 servedChalfant Valley West M.W.C.Natural background0.31 mg/LSep 202545 servedChalk Hill Estates HoaNatural background0.60 mg/LMar 202638 servedChamisal MwcNatural background0.42 mg/LJan 202684 servedChanac Creek Mutual Water CompanyHealth-study range6.80 mg/LApr 2026240 servedChannel Islands Beach Csdpurchased waterHuman impact likely1.50 mg/LJun 20264,560 servedCharles Brown Water CompanyNatural background0.43 mg/LMay 2025242 servedCherry Lane Trailer ParkNatural background0.20 mg/LAug 2025100 servedCherry Valley Water CompanyHealth-study range7.00 mg/LJan 2026210 servedChester Public U.D.Natural background0.90 mg/LJul 20252,187 servedChetmoore Acres WaHuman impact likely1.60 mg/LApr 202659 servedChina Lake Acres Mutual Water CompanyHuman impact likely1.90 mg/LAug 2025198 servedChina Lake Naval Air Weapons StationHuman impact likely1.90 mg/LOct 20256,600 servedCity of ChinoHuman impact clear3.60 mg/LMay 202686,435 servedChino Basin Desalter Auth. - Desalter 1Human impact clear3.40 mg/LMay 20260 servedChino Basin Desalter Auth. - Desalter 2Health-study range5.30 mg/LMay 20260 servedCity of Chino HillsHuman impact clear3.70 mg/LMay 202676,414 servedChiri Sweet Water CompanyHealth-study range9.70 mg/LFeb 202640 servedChiriaco Summit Water Dist.purchased waterNatural background0.68 mg/LApr 2026544 servedChoctaw Valley Mutual Water Co.Human impact clear3.10 mg/LAug 202544 servedChorro Valley Pipeline - Slo Countypurchased waterNatural background0.08 mg/LOct 20250 servedChowchilla City Water DeptNatural background0.61 mg/LDec 202513,916 servedChristian Encounter MinistriesNatural background0.62 mg/LApr 202635 servedChristian Valley Park CsdNatural background0.20 mg/LDec 20251,800 servedChuckawalla Valley State PrisonNatural background0.20 mg/LApr 20264,090 servedCircle Oaks Water DistrictNatural background0.20 mg/LDec 2025500 servedClark Street Community WellNatural background0.48 mg/LMar 202690 servedClawaNatural background0.47 mg/LMay 20262,320 servedClayton Palms Waterpurchased waterNatural background0.43 mg/LApr 2026549 servedClear Creek Csd-AndersonNatural background0.40 mg/LJul 20258,900 servedClear Creek Csd-WestwoodNatural background0.63 mg/LApr 2026400 servedClear Creek Water CompanyHuman impact likely1.10 mg/LMay 202540 servedClear Ridge WaNatural background0.05 mg/LFeb 2026123 servedClear Skies Mobile Home ParkHuman impact likely1.40 mg/LOct 2025131 servedClements Water Works #43Human impact likely1.40 mg/LFeb 2026264 servedClio Public Utility DistrictNatural background0.20 mg/LApr 202679 servedCity of CloverdaleNatural background0.74 mg/LMar 202610,398 servedCloverdale Mutual Water Co.Human impact likely1.50 mg/LMay 2026455 servedCity of ClovisHuman impact clear3.50 mg/LMay 2026130,130 servedCoachella Vwd: Cove CommunityHuman impact likely1.30 mg/LSep 2025270,000 servedCoachella Vwd: I.D. No. 8Natural background0.52 mg/LFeb 20264,600 servedCoachella Water AuthorityNatural background0.86 mg/LApr 202643,590 servedCoast Springs - Cal. Water Service (Puc)Human impact likely1.00 mg/LMay 2026388 servedCoastside County Water DistrictNatural background0.05 mg/LMay 202618,940 servedCobb Area County Water DistrictNatural background0.20 mg/LApr 20263,515 servedCobles CornerHealth-study range7.10 mg/LApr 202650 servedCold Creek Mutual Water CompanyNatural background0.12 mg/LSep 202325 servedCold Springs Water CoNatural background0.26 mg/LJul 20251,771 servedCold Water Canyon MwcNatural background0.12 mg/LDec 202565 servedCollege Park Mutual Water CompanyNatural background0.20 mg/LJul 2025244 servedColonia Santa MariaHealth-study range6.70 mg/LNov 202532 servedColonial Oak Wc IncAbove the federal limit10.80 mg/LJun 2026198 servedColonial ParkNatural background0.20 mg/LMar 2026342 servedColorado Mutual Water CompanyHuman impact likely2.40 mg/LOct 202539 servedCity of ColtonNatural background0.84 mg/LMay 202446,525 servedCity of ColusaNatural background0.12 mg/LNov 20256,447 servedColusa Co. Service Area #2-StonyfordNatural background0.20 mg/LJul 2025250 servedColusa Co. Wwd #1 - GrimesNatural background0.05 mg/LMay 2026512 servedColusa Co. Wwd #2 - PrincetonNatural background0.74 mg/LDec 2025382 servedCommerce-City, Water Dept.Natural background0.20 mg/LMay 20264,205 servedCommunity Mutual Water CoHuman impact likely2.40 mg/LDec 202565 servedCompton-City, Water Dept.Natural background0.20 mg/LApr 202674,877 servedContra Costa Water DistrictNatural background0.43 mg/LApr 2026198,000 servedControl Gorge Power Plant LadwpNatural background0.42 mg/LSep 202532 servedCopco Lake MwcNatural background0.05 mg/LMay 2026181 servedCorby Avenue ApartmentsNatural background0.20 mg/LJan 202638 servedCity of CorcoranHuman impact likely2.60 mg/LMay 202622,808 servedCorda Rd WsHealth-study range7.40 mg/LMay 202654 servedCorinthian Bay Mutual Water CompanyNatural background0.20 mg/LApr 2026150 servedCity of CorningHuman impact likely1.07 mg/LNov 20258,244 servedCorning Rv ParkHealth-study range6.00 mg/LSep 2025112 servedCity of CoronaHuman impact clear3.40 mg/LJun 2026168,575 servedCorral Hollow PwsHealth-study range7.80 mg/LMar 2026145 servedCorrectional Training Facility - SoledadHuman impact clear4.20 mg/LJun 20264,269 servedCortland Pines Mutual Water CoNatural background0.20 mg/LFeb 202692 servedCity of CotatiNatural background0.20 mg/LMay 20257,303 servedCottonwood Ridge Manufactured Housing CoNatural background0.87 mg/LApr 2026205 servedCottonwood Water DistrictHuman impact likely1.68 mg/LMar 20263,316 servedCountry Club County WdHuman impact clear3.40 mg/LNov 202564 servedCountry Club Vista Mutual Water CoNatural background0.20 mg/LSep 202575 servedCountry Hills EstatesNatural background0.12 mg/LApr 202660 servedCountry Leisure Mobile EstatesHuman impact likely1.00 mg/LApr 202640 servedCountry Manor MhpHuman impact likely1.30 mg/LFeb 202675 servedCountry Squire Mobile Estates & Water SyHuman impact likely1.90 mg/LJan 2026131 servedCountry Villa AptsNatural background0.20 mg/LDec 202560 servedCountry Village Mobile Home ParkNatural background0.12 mg/LJan 202650 servedCountryside Estates MwcHuman impact likely1.10 mg/LFeb 2026243 servedCountryside Mobile Home ParkNatural background0.12 mg/LJan 2026185 servedCounty Service Area 11Human impact clear4.80 mg/LAug 2025642 servedCove Mobile VillaHuman impact likely2.25 mg/LMar 2026105 servedCovelo Mobile Home ParkHuman impact likely2.20 mg/LJul 202530 servedCovina Irrigating Co.Health-study range7.00 mg/LJun 20260 servedCovina-City, Water Dept.purchased waterHealth-study range7.00 mg/LJun 202633,300 servedCovington Mill - ANatural background0.05 mg/LSep 202460 servedCoyote Valley Mutual Water CoHuman impact likely1.70 mg/LJun 2025125 servedCoyote Valley Rv ResortNatural background0.40 mg/LOct 2025500 servedCrass Mutual Water CompanyHuman impact likely1.30 mg/LMar 202680 servedCreekside Cabins & Rv ResortNatural background0.20 mg/LAug 2025124 servedCreekside Mobilehome ParkNatural background0.16 mg/LMar 202585 servedCreekside VillageHuman impact likely1.72 mg/LJan 2026300 servedCity of Crescent CityHuman impact likely1.80 mg/LJul 202517,262 servedCrescenta Valley CwdHealth-study range6.00 mg/LJun 202635,841 servedCresta Mesa ParqueHuman impact likely1.10 mg/LJan 202625 servedCrestline Village Cwd - Division 10Human impact likely1.90 mg/LMay 202611,650 servedCrestview Mutual Water CoNatural background0.20 mg/LJun 20252,079 servedCrestwood Heights Water AssnNatural background0.05 mg/LJan 2026126 servedCrowley Lake Mutual Water CompanyNatural background0.12 mg/LSep 2024175 servedCrowley Lake Trailer ParkNatural background0.10 mg/LSep 2025230 servedCrows Landing Comm Svc DistrictHuman impact clear4.30 mg/LMar 2026500 servedCrystal Caves MhpHuman impact likely1.90 mg/LMar 2026112 servedCrystal Lake Property OwnersNatural background0.20 mg/LApr 2026186 servedCrystalsHuman impact likely2.30 mg/LJan 202640 servedCsa 42 Oro GrandeNatural background0.20 mg/LMar 2026529 servedCsa 51Natural background0.97 mg/LAug 2025350 servedCsa 62Natural background0.10 mg/LSep 2025614 servedCsa 70 W-3 HaciendaHuman impact likely2.00 mg/LJan 2026611 servedCsa 70 W-4 PioneertownHuman impact likely2.20 mg/LMar 2026470 servedCsa 70-F MorongoHuman impact likely1.60 mg/LApr 2026300 servedCsa No. 31 Stonegate WsNatural background0.10 mg/LJul 2025230 servedCucamonga Valley Water DistrictHealth-study range6.20 mg/LJun 2026211,069 servedCity of CupertinoHuman impact clear3.60 mg/LJan 202616,336 servedCurrier Estates Water CorpNatural background0.70 mg/LOct 2025148 servedCuyama Community Services DistrictNatural background0.10 mg/LApr 2026700 servedCuyamaca Water DistrictNatural background0.20 mg/LApr 20262,923 servedCws - BakersfieldNatural background0.20 mg/LMay 2026267,881 servedCws - Fremont ValleyNatural background0.60 mg/LApr 2026167 servedCws - KernvilleNatural background0.20 mg/LMay 20262,572 servedCws - LakelandHuman impact clear4.10 mg/LMay 2026294 servedCws - Lower Bodfish Water SystemHuman impact likely1.20 mg/LMar 2026736 servedCws - North GardenNatural background0.20 mg/LMay 202622,762 servedCws - SelmaHuman impact clear3.70 mg/LMay 202626,517 servedCws - Tulco Water CompanyHealth-study range7.50 mg/LMay 2026716 servedCws - Upper Bodfish Water SystemNatural background0.20 mg/LMay 2026307 servedCws - VisaliaHealth-study range6.90 mg/LMay 2026148,496 servedCws Southlake SystemHealth-study range5.10 mg/LMay 20261,112 servedCws-Grand Oaks Water SystemHuman impact clear3.90 mg/LFeb 2026122 servedCws-Onyx Water SystemHuman impact likely1.40 mg/LMay 2026284 servedCws-Split Mountain Water SystemNatural background0.82 mg/LJan 2026226 servedCwsc King CityHealth-study range5.20 mg/LAug 202416,334 servedCwsc Los Altos SuburbanHuman impact clear4.30 mg/LMay 202669,973 servedCwsc SalinasHealth-study range6.30 mg/LMay 2026123,679 servedCwsc Salinas HillsHuman impact clear3.40 mg/LMar 20265,293 servedCypress Canyon Water SystemHuman impact likely1.10 mg/LApr 202644 servedCypress Mutual Water Co Incpurchased waterHuman impact likely1.50 mg/LJun 2026224 served
D
Daggett Comm Svcs DistHealth-study range5.00 mg/LDec 2025795 servedCity of Daly CityHuman impact likely1.00 mg/LMay 2026104,901 servedCity of DavisHuman impact clear4.10 mg/LMay 202667,457 servedDeer Hill Mutual Water CoHealth-study range5.70 mg/LDec 202536 servedDeer Lodge Water SystemHuman impact likely1.10 mg/LFeb 2026845 servedDel Dios Mutual Water CompanyHealth-study range5.60 mg/LMar 2026330 servedCity of Del Marpurchased waterNatural background0.20 mg/LMay 20263,919 servedDel Monte Farms Rd Ws #03Natural background0.20 mg/LSep 202555 servedDel Norte Mutual Water Co.Health-study range8.20 mg/LMay 2026215 servedDel Oro River Island Serv Terr #1Health-study range6.59 mg/LMay 20261,280 servedDel Oro River Island Serv Terr #2Human impact likely1.40 mg/LMay 202689 servedDel Oro Traver DistrictHealth-study range9.50 mg/LMay 2026657 servedDel Oro Water Co - Metropolitan DistrictAbove the federal limit10.80 mg/LMar 202692 servedDel Oro Water Co.-Johnson ParkNatural background0.20 mg/LApr 2026904 servedDel Oro Water Co.-Lime Saddle MarinaHuman impact likely2.62 mg/LMay 2025895 servedDel Oro Water Co.-MagaliaHuman impact clear3.07 mg/LMay 2025340 servedDel Oro Water Co.-Paradise PinesNatural background0.66 mg/LFeb 202610,940 servedDel Oro Water Co.-Stirling BluffsNatural background0.20 mg/LSep 2025521 servedDel Oro Water Company - Buzztail Dist.Natural background0.20 mg/LFeb 2026106 servedDel Oro Water Company - Strawberry Div.Natural background0.20 mg/LDec 20231,295 servedDel Oro Wc - Arbuckle DistrictHuman impact likely2.61 mg/LFeb 2026185 servedDel Oro Wc - Black Butte DistrictHuman impact likely1.97 mg/LFeb 2026277 servedDel Oro Wc - Country Estates DistHealth-study range5.14 mg/LFeb 2026297 servedDel Oro Wc - Larkspur MeadowsHealth-study range5.25 mg/LFeb 2026116 servedDel Rey Community Serv DistHuman impact likely1.40 mg/LApr 20261,491 servedDel Rio East Hoa Water SystemHealth-study range8.20 mg/LApr 2025110 servedDel Rio MutualHuman impact likely1.90 mg/LDec 2025700 servedDel Sur Gardens Trailer ParkHealth-study range5.50 mg/LFeb 202625 servedCity of DelanoHealth-study range5.80 mg/LJun 202651,428 servedDelany WcHealth-study range5.20 mg/LMay 202660 servedDelores Lane Water SystemHuman impact clear4.80 mg/LFeb 202659 servedDelta Conservation CampNatural background0.95 mg/LSep 202565 servedDelta Mutual Water CompanyNatural background0.20 mg/LApr 2026333 servedDempsey Road Mutual Water CoHuman impact likely1.50 mg/LMar 2026990 servedDenair Community Services DistrictHealth-study range8.50 mg/LMay 20265,090 servedDepartment of Water And PowerAbove the federal limit11.00 mg/LSep 2025239 servedDescanso Community Water DistrictNatural background0.42 mg/LDec 2025870 servedDesert Dawn MwcHuman impact likely1.10 mg/LMar 2026150 servedDesert Lake Comm Serv DistHuman impact clear4.30 mg/LAug 2025968 servedDesert Palms Mobile Home ParkHuman impact likely2.50 mg/LAug 2025140 servedDesert Springs MwcHuman impact likely1.00 mg/LApr 2026325 servedDesert View Trailer ParkNatural background0.20 mg/LMar 202660 servedDesert Water AgencyNatural background0.58 mg/LMar 202674,807 servedDesmond Rd Ws #03Natural background0.70 mg/LDec 202556 servedDevore WcHealth-study range9.50 mg/LJun 20261,574 servedDiablo Water DistrictNatural background0.91 mg/LJan 202643,357 servedDiamond A Mutual Water CompanyNatural background0.20 mg/LMar 2026640 servedDingerville Usa ParkHuman impact likely1.17 mg/LMay 2025220 servedTown of Discovery BayNatural background0.20 mg/LMay 202616,790 servedCity of DixonHuman impact clear4.90 mg/LApr 202612,540 servedDogwood Blue Jay Cyn ImpNatural background0.20 mg/LMay 2026232 servedDolan Rd MwcHuman impact likely1.00 mg/LJan 2026120 servedDolphin Isle MarinaNatural background0.20 mg/LAug 2025560 servedDonner Summit Public Utility DistrictNatural background0.20 mg/LSep 2023310 servedCity of DorrisNatural background0.05 mg/LDec 2024887 servedDouble L Mobile EstatesNatural background0.90 mg/LJan 2026320 servedDoubletree Ranch Water SystemNatural background0.20 mg/LMay 202566 servedDowney - City, Water Dept.Human impact clear4.10 mg/LApr 2026110,556 servedDownieville Public U.D.Natural background0.20 mg/LAug 2024783 servedDowntown Graton Mutual Water SystemNatural background0.20 mg/LMar 2026115 servedDublin San Ramon Services Districtpurchased waterHuman impact clear4.06 mg/LMay 202698,776 servedDune 3 Mutual Water Company, LlcHuman impact likely2.17 mg/LJun 2025119 servedDunrovin Mobile Home VillageHuman impact clear3.50 mg/LFeb 202699 servedCity of DunsmuirNatural background0.25 mg/LSep 20251,707 servedDurham Irrigation DistrictHealth-study range5.80 mg/LApr 20261,581 servedDutch Slough Water WorksNatural background0.20 mg/LAug 202549 servedDwp - FawnskinNatural background0.20 mg/LSep 20251,271 served
E
Eagle'S Nest ResortHuman impact clear3.20 mg/LDec 202560 servedEarlimart PudHuman impact clear4.00 mg/LJul 20257,679 servedEast Acres Mutual Water CompanyNatural background0.12 mg/LNov 2025250 servedEast Bay MudNatural background0.20 mg/LMay 20261,442,800 servedEast Inyokern Mutual WaterHuman impact likely1.80 mg/LAug 202587 servedEast Niles CsdHealth-study range6.80 mg/LMay 202632,517 servedEast Orange County Wd - RzHuman impact likely2.58 mg/LApr 20263,464 servedEast Orange County Wd - Wzpurchased waterNatural background0.68 mg/LApr 20260 servedCity of East Palo AltoNatural background0.20 mg/LSep 202529,519 servedEast Valley Farms Mutual Water CompanyHealth-study range9.30 mg/LMay 2026142 servedEast Valley Water DistrictHealth-study range5.70 mg/LJun 2026108,629 servedEast Walnut Grove [Sws]Natural background0.12 mg/LMay 2026300 servedEastern Municipal WdHuman impact likely2.50 mg/LApr 2026666,581 servedEaston Estates Water CompanyHuman impact likely2.90 mg/LDec 2025302 servedEastside Water AssociationNatural background0.73 mg/LMar 20262,000 servedEccoNatural background0.20 mg/LJan 2026100 servedEcho Valley Rd Ws #05Health-study range9.80 mg/LJan 202645 servedEddy DriveHuman impact clear3.20 mg/LOct 202548 servedEdgewater Mobile Home ParkNatural background0.12 mg/LMar 202540 servedEdna Valley Ranch EastHuman impact likely1.40 mg/LApr 2026132 servedEdwards Afb - Main BaseNatural background0.41 mg/LApr 202611,316 servedEl Adobe Poa, Inc.Health-study range5.60 mg/LJul 2025200 servedEl Camino Wc IncHuman impact likely1.30 mg/LJun 2026133 servedEl Capitan Mutual Water CompanyNatural background0.20 mg/LJan 2026325 servedCity of El CentroNatural background0.62 mg/LApr 202643,772 servedEl Dorado Mobile Home ParkHuman impact clear4.50 mg/LMay 2026318 servedEl Dorado Mutual Water Co.Human impact likely1.10 mg/LJul 2025660 servedEl Dorado West MhpHuman impact likely1.40 mg/LMar 2026203 servedEl Monte-City, Water Dept.Health-study range5.60 mg/LSep 202322,968 servedEl Nido Mobile Home ParkNatural background0.20 mg/LNov 2025137 servedEl Portal Mobile EstatesHuman impact likely2.90 mg/LJun 2025200 servedEl Rancho Mobile Home ParkNatural background0.23 mg/LAug 2025215 servedEl Rancho TajiguasNatural background0.20 mg/LSep 202540 servedEl Rio Mobile Home ParkHealth-study range8.00 mg/LJun 202660 servedEl Segundo-City, Water Dept.purchased waterNatural background0.68 mg/LApr 202616,445 servedEl Toro Water Districtpurchased waterNatural background0.68 mg/LApr 202651,800 servedEleven Oaks Mobile Home CommunityNatural background0.20 mg/LApr 2026262 servedElk County Water DistrictNatural background0.20 mg/LNov 2025380 servedElk Creek Community S.D.Natural background0.20 mg/LJan 2026212 servedElk Grove Water DistrictNatural background0.47 mg/LMay 202643,813 servedElkhorn Estates Water SystemHealth-study range7.00 mg/LFeb 2026234 servedElkhorn Rd Ws #04Natural background0.10 mg/LJan 202660 servedElkins RanchHuman impact likely1.70 mg/LSep 2025150 servedEllwood Mutual Water CompanyNatural background0.20 mg/LMay 2025186 servedElsinore Valley MwdHuman impact likely1.00 mg/LMay 2026169,455 servedEmerald City Mutual Water CoHuman impact likely1.30 mg/LJun 202626 servedEmerald Valley Mutual Water CompanyHealth-study range6.60 mg/LMay 202643 servedEmigrant Gap Mutual Water Co.Natural background0.20 mg/LJul 2025125 servedEncinal Rd Ws #01Human impact likely1.10 mg/LMay 202691 servedEnclave At The DeltaHuman impact clear3.20 mg/LMay 202639 servedEnd-O-Valley Mutual Water CompanyNatural background0.20 mg/LJan 2026129 servedEnos Lane Public Utility DistrictHuman impact likely1.60 mg/LAug 2025365 servedErskine Creek WcHuman impact clear3.70 mg/LApr 20262,500 servedEsalen Institute WsNatural background0.05 mg/LNov 2025246 servedCity of EscalonHealth-study range6.90 mg/LMar 20267,429 servedCity of EscondidoNatural background0.20 mg/LMay 2026137,044 servedEsparto C.S.D.Human impact clear4.30 mg/LApr 20263,574 servedEsterina PropertiesNatural background0.20 mg/LJun 202550 servedEstero Municipal Improvement Districtpurchased waterNatural background0.42 mg/LJun 202536,556 servedEstero MutualNatural background0.20 mg/LJul 2025206 servedEvergreen Mobile EstatesHuman impact clear4.70 mg/LMar 202665 servedEvergreen Mobile Home ParkHuman impact clear3.50 mg/LDec 202536 servedEvergreen Motel & MhpNatural background0.20 mg/LMar 202628 servedEvergreen Mutual Water CompanyHuman impact likely1.80 mg/LMar 202698 served
F
City of FairfieldNatural background0.03 mg/LApr 2026120,377 servedFairoaks Pws #44Human impact clear4.20 mg/LMay 20261,172 servedFairway Downs Mutual Water CoNatural background0.69 mg/LApr 2026100 servedFairway Estates Pws Csa-18Natural background0.70 mg/LFeb 2026149 servedFairway Mutual Water CoNatural background0.38 mg/LOct 2024150 servedFall River Valley CsdNatural background0.20 mg/LJan 20261,535 servedFallbrook PudNatural background0.20 mg/LMay 202635,237 servedFalling Rock Rv ParkHuman impact likely1.12 mg/LMar 202525 servedFallon Road Labor HousingHealth-study range5.70 mg/LApr 202684 servedFallsvale Service CompanyNatural background0.20 mg/LJan 20261,046 servedFarm Mutual W.C. (The)Human impact clear4.30 mg/LOct 20254,026 servedFarmington Water CompanyHuman impact likely2.60 mg/LAug 2025270 servedFarrar Park Property OwnersNatural background0.20 mg/LDec 2025140 servedFcsa 10 - Cumorah KnollsHealth-study range6.40 mg/LJul 2025132 servedFcsa 14 - Belmont ManorHuman impact likely2.50 mg/LJul 2025115 servedFcsa 34B - Ventana HillsAbove the federal limit11.00 mg/LDec 202548 servedFcsa 39 - A And Bpurchased waterHealth-study range6.40 mg/LMay 2026395 servedFcsa 43 - Raisin CityHuman impact likely2.90 mg/LApr 2025182 servedFcsa 44C - Riverview EstatesHealth-study range7.10 mg/LDec 202534 servedFcwwd 18/FriantNatural background0.12 mg/LAug 2025909 servedFcwwd 38/Sky HarbourHuman impact likely1.40 mg/LSep 2025185 servedFcwwd 40 - Shaver SpringsNatural background0.12 mg/LFeb 2026196 servedFcwwd 42/Alluvial & FancherHealth-study range7.90 mg/LApr 2026291 servedFeather River ManorNatural background0.20 mg/LJun 202535 servedFeather River Rv & MhpNatural background0.20 mg/LJul 2025741 servedFellowship of FriendsNatural background0.20 mg/LJun 2025160 servedFenner Canyon Youth Conservation CampNatural background0.12 mg/LMar 202665 servedFern Grove Water ClubNatural background0.26 mg/LJul 2025187 servedFern Valley WdNatural background0.20 mg/LApr 2026900 servedFernwood WsNatural background0.80 mg/LJun 2026184 servedFiddletown Community ServiceNatural background0.20 mg/LNov 2025100 servedFillmore Irrigation CoHuman impact likely2.90 mg/LJul 2025353 servedFillmore Water DeptHuman impact likely1.10 mg/LMar 202616,419 servedFinnlees Trailer ParkHealth-study range6.00 mg/LMar 202655 servedFircrest Mutual Water CompanyHuman impact clear4.50 mg/LMar 2026126 servedFire Suppression Camp #19Natural background0.21 mg/LMay 2026125 servedFirst Mutual Water SystemHuman impact likely1.90 mg/LOct 202535 servedFisherman'S Bend MhpHealth-study range7.10 mg/LApr 2026120 servedFisherman'S RetreatNatural background0.10 mg/LJan 2026352 servedFlorin County Water DistrictHuman impact likely1.50 mg/LApr 20267,831 servedFloriston Water SystemNatural background0.07 mg/LJan 2026110 servedFolsom Lake Mutual Water Copurchased waterNatural background0.20 mg/LAug 2025333 servedFolsom, City of - AshlandNatural background0.12 mg/LApr 20263,317 servedFolsom, City of - MainNatural background0.13 mg/LJan 202680,969 servedFoothill ApartmentsHealth-study range8.00 mg/LJun 202641 servedFoothill Estates MhpHuman impact clear3.60 mg/LNov 202566 servedFoothill Estates WsHealth-study range5.90 mg/LMay 2026183 servedFoothill Municipal Water Dist.purchased waterNatural background0.68 mg/LApr 20260 servedFoothill Mutual Water CompanyHealth-study range7.30 mg/LJun 202536 servedFoothill WaHealth-study range5.40 mg/LJun 202646 servedFoothills Manufactured Home CommunutyNatural background0.05 mg/LApr 2025180 servedForest Knolls Mutual Water CoNatural background0.20 mg/LAug 202546 servedForest Lakes MwcNatural background0.20 mg/LOct 20251,067 servedForest Park MwcNatural background0.20 mg/LJan 2026406 servedForest Ranch Mutual Water SystemNatural background0.20 mg/LMar 2026119 servedForest Springspurchased waterNatural background0.03 mg/LMay 2025385 servedForest Village LlcNatural background0.34 mg/LFeb 202628 servedForesthill Public Utility DistNatural background0.20 mg/LMar 20266,782 servedForestville Water Districtpurchased waterNatural background0.20 mg/LDec 20253,788 servedCity of Fort BraggNatural background0.20 mg/LNov 20236,919 servedTown of Fort JonesHuman impact likely2.30 mg/LMar 2026695 servedFoster Farms #5Human impact likely2.80 mg/LJun 202526 servedFoster Road Mutual Water CompanyNatural background0.20 mg/LSep 2025150 servedCity of Fountain ValleyHuman impact likely1.53 mg/LApr 202656,747 servedFourth Street Water SystemHealth-study range5.40 mg/LApr 202656 servedCity of FowlerHealth-study range5.50 mg/LOct 20257,448 servedFowler Care CenterHealth-study range6.80 mg/LApr 202646 servedFrazier Park PudHealth-study range8.70 mg/LJun 20262,592 servedFrccsd Hot SpringsNatural background0.05 mg/LOct 202425 servedFrccsd Old Mill RanchNatural background0.11 mg/LAug 202432 servedFreeport MarinaNatural background0.12 mg/LFeb 202645 servedFremont OneAbove the federal limit13.20 mg/LMay 202639 servedCity of FresnoHealth-study range6.40 mg/LMay 2026545,716 servedFriendly Acres MhpHealth-study range8.10 mg/LMay 202675 servedFrontier Trails Homeowners Assoc Inc.Human impact likely1.50 mg/LOct 202532 servedCity of FullertonHuman impact likely1.20 mg/LApr 2026139,461 servedFulton Water CompanyNatural background0.20 mg/LOct 20252,593 served
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Gabilan WcHuman impact clear3.60 mg/LJan 2026535 servedGalindo Housing FacilityNatural background0.50 mg/LJan 202650 servedCity of GaltNatural background0.20 mg/LOct 202426,536 servedGarden Acres Mutual Water CoHuman impact likely2.80 mg/LJan 20261,335 servedGarden Farms C.W.D.Human impact clear4.60 mg/LMay 2026440 servedCity of Garden GroveHuman impact clear3.73 mg/LApr 2026174,226 servedGarlen Court WsHuman impact likely1.00 mg/LJan 202665 servedGatewayNatural background0.20 mg/LDec 20251,800 servedGateway Mobile Home ParkHealth-study range6.90 mg/LApr 2026103 servedGayla Manor PwsHuman impact clear4.90 mg/LFeb 2026178 servedGeorge Ranch Mutual Water CompanyHuman impact likely1.40 mg/LFeb 2026148 servedGeorgetown Divide PudNatural background0.20 mg/LNov 20259,434 servedGerber Las Flores CsdHuman impact likely2.60 mg/LApr 20251,200 servedGilbert Street ComplexHealth-study range7.00 mg/LAug 20253,833 servedGill Creek Mutual Water CompanyNatural background0.20 mg/LApr 2026290 servedCity of GilroyHealth-study range7.90 mg/LApr 202659,203 servedGleanings For The HungryHuman impact clear4.60 mg/LMay 202531 servedGlen Eden Sun ClubHealth-study range6.20 mg/LJun 2026566 servedGlen Helen Water SystemHuman impact clear4.60 mg/LMay 20265,900 servedGlen Ivy Hot SpringsNatural background0.20 mg/LAug 20251,087 servedGlen Martin MwcHuman impact likely2.90 mg/LAug 2025450 servedGlendale-City, Water Dept.Health-study range7.10 mg/LMay 2026188,784 servedGlendora-City, Water Dept.Natural background0.60 mg/LJun 202649,934 servedGlenhaven Mutual Water CompanyNatural background0.56 mg/LMay 2026300 servedGlenn Ave Ws #01Health-study range8.10 mg/LMay 202673 servedGlennville Mutual Water CompanyNatural background0.12 mg/LAug 2025100 servedGlenwood Mobile EstatesNatural background0.27 mg/LDec 2025468 servedGlenwood Mobile Home ParkNatural background0.20 mg/LJul 2025100 servedGold Beach ParkNatural background0.20 mg/LSep 2025134 servedGold Country Home Park - Water SystemHuman impact likely2.78 mg/LJun 202560 servedGold Hill Mobilehome ParkHuman impact likely2.37 mg/LMar 202675 servedGold Mountain CsdNatural background0.20 mg/LMar 2026135 servedGold Rock RanchNatural background0.62 mg/LFeb 202640 servedGold Rush Mobile Home ParkNatural background0.43 mg/LOct 202467 servedGolden Acres Trailer ParkHuman impact likely1.30 mg/LApr 202645 servedGolden Era ProductionsNatural background0.20 mg/LJan 2026500 servedGolden Feather MhpHuman impact likely1.57 mg/LApr 2025275 servedGolden Heights Mutual Water CompanyHuman impact clear4.70 mg/LJun 202566 servedGolden Hills CsdHealth-study range8.81 mg/LFeb 20269,857 servedGolden Hills Mutual Water Copurchased waterNatural background0.20 mg/LAug 202584 servedGolden Meadows CsdNatural background0.50 mg/LJan 2026102 servedGolden Oaks Mobile Home ParkHealth-study range6.50 mg/LApr 202675 servedGolden Sands Mobile Home ParkHuman impact likely1.40 mg/LFeb 2026450 servedGolden Sierra Estates_Fka Mother LodeNatural background0.20 mg/LMar 2025210 servedGolden State Water Co - Apple Vly NorthNatural background0.94 mg/LFeb 20262,086 servedGolden State Water Co - Apple Vly SouthHuman impact likely2.20 mg/LFeb 20266,208 servedGolden State Water Co - BarstowHuman impact clear3.50 mg/LJun 202632,547 servedGolden State Water Co - LucerneNatural background0.78 mg/LMay 2026586 servedGolden State Water Co - Morongo Del SurNatural background0.57 mg/LApr 20261,717 servedGolden State Water Co - San Juan OaksNatural background0.20 mg/LFeb 2026159 servedGolden State Water Co - WrightwoodHuman impact clear4.70 mg/LApr 20264,177 servedGolden State Water Co. - CordovaHuman impact likely1.50 mg/LApr 202647,161 servedGolden State Water Co. - RobbinsNatural background0.20 mg/LApr 2024205 servedGolden State Water Co.-Clearlake SystemNatural background0.03 mg/LMay 20264,644 servedGolden State Water Company - Bay PointNatural background0.05 mg/LJul 202423,731 servedGolden State Water Company - EdnaHuman impact likely2.40 mg/LMay 20261,493 servedGolden State Water Company - Lake MarieNatural background0.96 mg/LApr 2026545 servedGolden State Water Company - Los OsosHuman impact clear4.10 mg/LJun 20265,924 servedGolden State Water Company - NipomoAbove the federal limit12.00 mg/LMay 20264,506 servedGolden State Water Company - OrcuttHealth-study range7.10 mg/LMay 202634,102 servedGolden State Water Company - Simi ValleyHuman impact clear4.00 mg/LJun 202645,128 servedGolden State Water Company - TanglewoodNatural background0.52 mg/LJan 20261,947 servedGolden State Water Company-Cypress RidgeHealth-study range6.60 mg/LJun 20262,026 servedGolden State Water Desert ViewHuman impact likely1.00 mg/LFeb 2026120 servedGolden State Water Morongo DelnorteNatural background0.20 mg/LFeb 2026373 servedGolden State Wc - Cowan HeightsHuman impact likely2.04 mg/LApr 20266,997 servedGolden State Wc - Placentia/Yorba LindaHuman impact likely1.71 mg/LApr 202650,381 servedGolden State Wc - West Orange CountyNatural background0.05 mg/LMay 2026114,379 servedGolden Valley Municipal Water DistrictHuman impact clear3.20 mg/LSep 202570 servedGoleta Water DistrictNatural background0.12 mg/LMar 202684,462 servedCity of GonzalesHealth-study range8.60 mg/LApr 20268,327 servedGordon Acres Water CoAbove the federal limit12.00 mg/LMar 2026200 servedGosford Road Water CompanyHuman impact likely1.50 mg/LAug 202550 servedGraeagle Water CompanyNatural background0.20 mg/LSep 2025737 servedGran Cielo Mutual Water CompanyHuman impact likely1.20 mg/LJan 2026139 servedGran Mutual Water CoNatural background0.40 mg/LDec 2025290 servedGraton Mutual Water SystemNatural background0.20 mg/LApr 202650 servedGreat Oaks Wc IncHealth-study range6.10 mg/LFeb 2026110,088 servedGreen Acres Mutual WaterNatural background0.12 mg/LDec 202553 servedGreen Acres WaHuman impact clear3.40 mg/LJan 202656 servedGreen Gulch FarmNatural background0.20 mg/LDec 202575 servedGreen Mountain Water CompanyNatural background0.99 mg/LApr 202680 servedGreen River Mutual Water Co.Human impact likely1.90 mg/LApr 2026350 servedGreen Valley CwdHealth-study range8.40 mg/LMar 20261,275 servedGreen Valley MwcNatural background0.77 mg/LMay 20262,993 servedCity of GreenfieldHuman impact likely1.20 mg/LJan 202618,967 servedGreenfield County WdHuman impact clear4.10 mg/LMar 202611,590 servedGreenhaven HoaNatural background0.20 mg/LOct 202538 servedGreenhorn Creek CsdNatural background0.20 mg/LMay 2026280 servedGrenada Sanitary DistrictHuman impact clear4.50 mg/LMay 2026289 servedCity of GridleyHuman impact likely1.30 mg/LMar 20257,269 servedGridley Farm Labor HousingNatural background0.05 mg/LDec 2025460 servedGrier Mutual Water CompanyNatural background0.20 mg/LMar 202698 servedGrizzly Lake Csd-Crocker/WelchNatural background0.07 mg/LNov 2025215 servedGrizzly Lake Csd-DellekerNatural background0.33 mg/LJun 20251,314 servedGrizzly Ranch CsdNatural background0.20 mg/LApr 2026102 servedCity of Grover Beach Public Works DeptHuman impact clear3.40 mg/LMay 202612,701 servedGswc - ArtesiaNatural background0.20 mg/LMar 202650,375 servedGswc - Bell, Bell GardensHuman impact likely2.10 mg/LFeb 202654,877 servedGswc - CalipatriaNatural background0.20 mg/LApr 20267,363 servedGswc - ClaremontHuman impact clear3.40 mg/LMay 202639,730 servedGswc - Culver Citypurchased waterNatural background0.68 mg/LApr 202638,213 servedGswc - Florence/GrahamHuman impact clear3.70 mg/LMar 202663,500 servedGswc - HollydaleNatural background0.20 mg/LFeb 20268,099 servedGswc - NorwalkHealth-study range5.80 mg/LMay 202643,176 servedGswc - SouthwestNatural background0.03 mg/LMay 2026277,740 servedGswc - WillowbrookNatural background0.20 mg/LFeb 202610,747 servedGswc-San DimasHuman impact clear3.30 mg/LJun 202656,538 servedGswc-South ArcadiaHuman impact likely2.10 mg/LMay 202627,072 servedGswc-South San GabrielHuman impact clear3.50 mg/LJun 202626,240 servedGuadalupe Valley Midpurchased waterNatural background0.42 mg/LJun 20251,472 servedGuadalupe Water DepartmentNatural background0.40 mg/LMar 20268,897 servedGuatay Mutual Benefit CorporationHuman impact likely2.50 mg/LNov 2025100 served
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H & J Water CompanyNatural background0.20 mg/LDec 202586 servedH2O, IncNatural background0.12 mg/LJul 202570 servedHalcyon Water SystemHuman impact likely2.30 mg/LApr 2026110 servedHamilton Branch CsdNatural background0.20 mg/LJul 20251,874 servedCity of HanfordNatural background0.12 mg/LDec 202562,127 servedHanot Foundation IncNatural background0.89 mg/LMar 202638 servedHappy Acres Mutual Benefit Water SystemNatural background0.20 mg/LMar 2026260 servedHappy Acres MwcNatural background0.81 mg/LJan 2026220 servedHappy Harbor (Sws)Natural background0.12 mg/LApr 202660 servedHarbor View WaHuman impact likely1.40 mg/LDec 202575 servedHardwick Water CompanyNatural background0.81 mg/LOct 202569 servedHarmony HavenHuman impact clear3.90 mg/LJan 202654 servedHarmony VillageNatural background0.12 mg/LFeb 202625 servedHart Creek Estates Mutual Water Co.Natural background0.28 mg/LOct 2025148 servedHart Flat Bear Mutual WaterNatural background0.43 mg/LJul 202556 servedHartley Mutual Water SystemNatural background0.90 mg/LMar 202641 servedHarvest Moon Mutual Water CoHuman impact clear4.70 mg/LApr 2026138 servedHaven Acres River Club IncNatural background0.20 mg/LAug 2025100 servedHawkins Water Co-Cal Water Service (Puc)Natural background0.12 mg/LOct 202581 servedHawthorne-City Water Dept.Natural background0.40 mg/LMay 202644,718 servedHaynes Board & Care HomeHuman impact likely2.50 mg/LJul 202541 servedCity of HaywardHuman impact clear3.70 mg/LJan 2026162,954 servedCity of HealdsburgNatural background0.20 mg/LMar 202610,985 servedHeath Brimhall P.O.A.Human impact clear4.30 mg/LAug 202539 servedHeather Glen Community Service DistNatural background0.20 mg/LDec 2025250 servedHeavenly OaksNatural background0.20 mg/LApr 2026300 servedHeber Public Utility DistrictNatural background0.20 mg/LApr 20266,979 servedHeights Mutual Water CompanyNatural background0.20 mg/LNov 2025363 servedHelendale Community Service DistrictNatural background0.20 mg/LMay 20266,347 servedHelix Water DistrictNatural background0.33 mg/LMar 2026277,668 servedCity of HemetHealth-study range5.20 mg/LApr 202633,828 servedHemlock Mutual Water Co.Human impact clear3.00 mg/LJul 2025686 servedHeritage Ranch CsdNatural background0.20 mg/LNov 20252,956 servedHerlong Public Utility DistrictNatural background0.23 mg/LMay 20262,114 servedHesperia WdNatural background0.63 mg/LApr 2026100,744 servedHess WineryNatural background0.50 mg/LNov 2025250 servedHhw&P Moccasin Compound-Sfpucpurchased waterNatural background0.42 mg/LJun 2025410 servedHi Desert MwcHuman impact likely1.40 mg/LSep 2025112 servedHi Desert WdHuman impact clear4.30 mg/LMay 202626,411 servedHidden Acres Trailer VillaNatural background0.30 mg/LNov 202580 servedHidden Canyon Ranch MwcHuman impact likely1.40 mg/LMay 2026116 servedHidden Harbor Marina & RvpNatural background0.50 mg/LJun 202570 servedHidden Meadow Mutual Water CoNatural background0.05 mg/LDec 202545 servedHidden Valley Community Associationpurchased waterNatural background0.20 mg/LAug 2025499 servedHidden Valley Lake CsdHuman impact likely1.70 mg/LMay 20266,235 servedHidden Valley WaHuman impact clear4.50 mg/LMar 202587 servedHidden Views Mhp WsHuman impact likely2.10 mg/LMar 202665 servedHigh Desert Detention CenterNatural background0.20 mg/LMar 20263,035 servedHigh Valleys Water Districtpurchased waterHuman impact likely1.40 mg/LMar 2026733 servedHighland Mobile Home ParkNatural background0.44 mg/LDec 20251,400 servedHiguera ApartmentsHealth-study range8.60 mg/LDec 202530 servedHills Ranch Mutual Water CompanyNatural background0.20 mg/LNov 202579 servedTown of Hillsboroughpurchased waterNatural background0.42 mg/LJun 202511,766 servedHillsview HomesHealth-study range6.16 mg/LApr 2026887 servedHillview Acres Mutual Water CompanyHuman impact clear4.60 mg/LApr 202636 servedHilmar County Water DistrictNatural background0.70 mg/LJun 20265,504 servedHilton Mutual Water CompanyHuman impact likely2.40 mg/LJul 2025100 servedHitchcock Rd Ws #01Natural background0.60 mg/LMay 2026360 servedHoliday Mobile VillageHuman impact clear3.57 mg/LJul 2025200 servedHolland Heights Mutual Water CompanyNatural background0.20 mg/LFeb 2026300 servedCity of HollisterNatural background0.20 mg/LSep 202526,017 servedHollister Ranch EstatesHealth-study range5.50 mg/LMar 2026150 servedHolly Hills Mwcpurchased waterHuman impact clear4.40 mg/LMar 2026108 servedHolly Ranch VillageHuman impact likely1.50 mg/LJan 202650 servedCity of HoltvilleNatural background0.20 mg/LApr 20266,355 servedHome Garden CsdNatural background0.12 mg/LApr 20261,750 servedHome Gardens County Wdpurchased waterHuman impact clear3.40 mg/LJun 20263,095 servedHometown Colonial Estates LlcNatural background0.20 mg/LMar 2026400 servedHometown Water AssociationHuman impact likely2.00 mg/LJul 202525 servedHoney Lake CampgroundNatural background0.20 mg/LMar 202625 servedHood Water Maintence Dist [Sws]Natural background0.12 mg/LMay 2025271 servedHope Foundation/Moriah HeightsNatural background0.20 mg/LJan 2026299 servedHopland Public Utility DistrictNatural background0.20 mg/LApr 20261,076 servedHornbrook C.S.D.Natural background0.05 mg/LMar 2025280 servedHowell Mountain Mutual Water CompanyNatural background0.20 mg/LMar 20261,240 servedHowell'S Lakeside Water Co.Natural background0.98 mg/LApr 202675 servedHrc C.S.D.Natural background0.58 mg/LMay 2025185 servedHuckleberry Mutual Water CompanyNatural background0.20 mg/LDec 202545 servedCity of HughsonHealth-study range8.10 mg/LJul 20257,481 servedHumboldt Highlands MutualNatural background0.20 mg/LFeb 202658 servedHumboldt Woodlands MutualNatural background0.20 mg/LMar 202655 servedHume Lake Christian Camps, IncNatural background0.12 mg/LJul 20251,519 servedHungry Gulch MwcHealth-study range7.10 mg/LApr 202674 servedHunter Valley CsdNatural background0.58 mg/LNov 202496 servedHunter'S Fishing ResortHealth-study range5.07 mg/LApr 202650 servedCity of Huntington BeachNatural background0.26 mg/LApr 2026201,000 servedHuntington Park-City, Water Dept.Natural background0.42 mg/LMay 202615,437 servedHynes Estates Mutual Water Co.Human impact clear3.72 mg/LMar 2026168 served
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Idyllwild Water DistrictNatural background0.28 mg/LNov 20253,762 servedIid VillageNatural background0.20 mg/LFeb 202637 servedIl VinetoNatural background0.20 mg/LOct 2025160 servedCity of ImperialNatural background0.20 mg/LApr 202621,591 servedImperial Manor Mobilehome CommunityNatural background0.20 mg/LMar 2026280 servedIndian Creek CsdHuman impact likely1.50 mg/LDec 20251,030 servedIndian Hills CampNatural background0.20 mg/LJun 202413,032 servedIndian Oaks Trailer ParkHealth-study range6.60 mg/LMay 202670 servedIndian Wells Valley W.D.Human impact likely1.90 mg/LApr 202641,580 servedIndio Water AuthorityNatural background0.58 mg/LMay 202684,757 servedCity of Industry Waterworks SystemsHealth-study range5.30 mg/LMay 20266,158 servedInglewood- City, Water Dept.Natural background0.12 mg/LMay 202680,824 servedInnisfree Water CompanyHuman impact likely2.80 mg/LDec 202456 servedInyo County Pwd - Independencepurchased waterNatural background0.50 mg/LMay 20251,108 servedInyo County Pwd - Lone Pinepurchased waterNatural background0.35 mg/LMay 20251,835 servedInyokern CsdHuman impact likely1.60 mg/LJul 2025878 servedIrish Beach Water DistrictNatural background0.20 mg/LSep 2023254 servedIrish Hills Mutual Water CoHuman impact clear4.50 mg/LApr 2026135 servedIronwood CampNatural background0.20 mg/LMar 2026210 servedIrvine Ranch Water DistrictNatural background0.20 mg/LMay 2026444,800 servedIslander MarinaNatural background0.20 mg/LAug 2025150 servedIvanhoe Public Utility DistAbove the federal limit15.00 mg/LMay 20264,580 servedIvcsd Crescent MillsNatural background0.14 mg/LApr 2025258 servedIverson & Jacks Apts WsNatural background0.05 mg/LMay 202686 served
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Jackson Hide-A-WayHuman impact likely1.90 mg/LOct 202525 servedJacumba Community SdNatural background0.19 mg/LApr 2026561 servedJames Court Water SystemHuman impact clear4.90 mg/LAug 2025208 servedJardines Del ValleNatural background0.30 mg/LOct 2025130 servedJarvis Mutual Water SystemNatural background0.05 mg/LJan 2026125 servedJohn Hovannisian Water SystemHuman impact clear4.40 mg/LMay 202680 servedJohn Latoracca Correctional FacilityHealth-study range5.26 mg/LFeb 2026800 servedJoint Regional Water Supply Systempurchased waterNatural background0.68 mg/LApr 20263,947 servedJonata Homeowners AssociationHuman impact likely1.10 mg/LJan 202630 servedJoshua Basin Water DistrictHuman impact likely1.60 mg/LMar 20266,640 servedJost Post WaNatural background0.05 mg/LMay 202656 servedJuanita Court Mutual WaterHuman impact clear4.52 mg/LOct 202527 servedJubilee MwcHuman impact likely2.30 mg/LDec 2025782 servedJulian Community Services DistrictNatural background0.92 mg/LMay 20261,517 servedJuniper Riviera CwdHuman impact likely1.90 mg/LJan 2026858 servedJurupa Community SdHealth-study range7.30 mg/LMay 2026135,093 servedJuvenile Justice CampusHuman impact likely2.10 mg/LFeb 2026565 served
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Keefer Creek EstatesHuman impact likely2.57 mg/LMay 2026160 servedKeeler Community Service DistrictNatural background0.05 mg/LAug 202566 servedKelly Mutual Water CompanyNatural background0.20 mg/LJul 2025135 servedKelseyville Co Waterworks District 3Natural background0.20 mg/LApr 20264,102 servedKen Mar GardensHuman impact likely2.00 mg/LApr 202684 servedKennon Water Companypurchased waterNatural background0.20 mg/LMar 2026142 servedKenwood Village Water Company (Puc)Human impact likely2.20 mg/LJun 20251,029 servedKeough'S Hot SpringsNatural background0.12 mg/LSep 2025175 servedKern County Water AgencyNatural background0.22 mg/LOct 20250 servedKern Mobile Estates LlcHuman impact likely2.20 mg/LJul 202573 servedKern Valley Mutual Water Companyno current resultlast Jul 2023132 servedKern Valley State PrisonHuman impact clear4.40 mg/LMay 20265,000 servedKernvale Mutual Water Copurchased waterHuman impact clear3.70 mg/LApr 202675 servedKeyes Community Services Dist.Natural background0.20 mg/LApr 20265,672 servedKing Island Trailer Park Water SystemNatural background0.20 mg/LNov 2025236 servedKings Canyon Mobile Home ParkNatural background0.12 mg/LMar 2024120 servedCity of KingsburgHealth-study range5.00 mg/LApr 202613,540 servedKinneloa Irrigation Dist.Health-study range5.90 mg/LApr 20261,960 servedKinnybrook Mutual Water CompanyNatural background0.20 mg/LApr 202548 servedKlamath C.S.D.Natural background0.81 mg/LMay 2025360 servedKnightsen Community Water SystemNatural background0.29 mg/LMar 202673 servedKnoll EnterprisesHealth-study range6.10 mg/LApr 2026500 servedKonocti ShoresAbove the federal limit36.00 mg/LMay 2026277 servedKorths Pirates LairNatural background0.20 mg/LAug 202555 servedKranenburg Water SystemHealth-study range5.11 mg/LDec 202542 servedKrista Mutual Water CompanyHuman impact clear3.30 mg/LMar 2026504 servedKrotona InstituteHuman impact clear3.30 mg/LFeb 202630 served
L
La Canada Irrigation Dist.Natural background0.20 mg/LJan 20269,300 servedLa Cima Fire CenterNatural background0.10 mg/LNov 202560 servedLa Cumbre Mutual Water CoHealth-study range6.90 mg/LMar 20264,861 servedCity of La HabraNatural background0.20 mg/LNov 202563,118 servedLa Habra Heights CwdHuman impact clear3.60 mg/LApr 20265,325 servedCity of La PalmaNatural background0.05 mg/LApr 202615,948 servedLa Puente Valley CwdHealth-study range7.20 mg/LMay 20268,243 servedLa Tierra Heights MutualHuman impact likely2.40 mg/LMar 202667 servedLa Torres ParkHealth-study range8.80 mg/LMar 202640 servedLa Verne, City WdHealth-study range6.20 mg/LMay 202631,334 servedLacsd - RimforestNatural background0.20 mg/LFeb 2026817 servedLadwp - Big PineNatural background0.93 mg/LMay 20250 servedLadwp - IndependenceNatural background0.50 mg/LMay 20250 servedLadwp - Lone PineNatural background0.35 mg/LMay 20250 servedLadwp - ManzanarNatural background0.05 mg/LMay 20250 servedLaguna Beach County Wdpurchased waterHuman impact clear3.09 mg/LMay 202618,404 servedLaguna Del Sol IncHuman impact likely2.70 mg/LJun 2025445 servedLaguna Mountain Mutual Water Co.Natural background0.20 mg/LDec 2025100 servedLaguna Negra Mutual Water Co.Health-study range6.40 mg/LMay 202680 servedLaguna Seca WcHuman impact likely2.30 mg/LMay 2026162 servedLaguna Village Rv ParkHuman impact likely2.60 mg/LMar 202628 servedLake Almanor Country Club MwcNatural background0.20 mg/LJun 20256,000 servedLake Arrowhead CsdNatural background0.20 mg/LFeb 20267,038 servedLake Canyon Mutual Water CompanyNatural background0.26 mg/LJan 2026156 servedLake County Csa 13 - Kono TayeeNatural background0.90 mg/LMar 2026449 servedLake County Csa 2 - Spring ValleyNatural background0.20 mg/LJul 20251,531 servedLake Don Pedro CsdNatural background0.20 mg/LNov 20253,240 servedLake Elizabeth Mutual Water Co.Health-study range7.60 mg/LJun 20261,790 servedLake Forest Mutual W.C.Natural background0.60 mg/LMay 2025565 servedLake Francis Mutual Water CompanyNatural background0.20 mg/LMay 202660 servedLake Hemet MwdHuman impact clear3.30 mg/LFeb 202652,913 servedLake Hemet Mwd-Camp GroundHuman impact likely2.10 mg/LApr 2026600 servedLake Hemet-Garner ValleyHuman impact clear4.00 mg/LApr 2026709 servedLake Henshaw Resort Inc.Natural background0.20 mg/LJan 20269,913 servedLake Isabella Community Services Distpurchased waterHuman impact clear3.70 mg/LApr 2026500 servedLake Jodie Water SystemNatural background0.20 mg/LJun 2025250 servedLake Madrone Water DistrictNatural background0.20 mg/LMar 2026297 servedLake Morena Views MwcAbove the federal limit34.00 mg/LMay 2026360 servedLake Morena'S Oak Shores MwcHuman impact clear4.50 mg/LMay 2026670 servedLake of The Woods Mobile VillageHuman impact clear3.90 mg/LApr 202682 servedLake of The Woods MwcHuman impact clear4.50 mg/LMay 2026779 servedLake San Antonio Mhp WsNatural background0.30 mg/LJun 202584 servedLake Shasta Pines Rv Park & CampgroundNatural background0.20 mg/LFeb 2026168 servedLake Shastina C.S.DNatural background0.34 mg/LSep 20252,790 servedLake Siskiyou M.W.C.Natural background0.14 mg/LJun 2024277 servedLake Success Mobile LodgeHealth-study range5.20 mg/LMay 202675 servedLake View Mutual Water Co.Human impact likely1.90 mg/LSep 202590 servedLakehead Subd Mutual Water CoNatural background0.15 mg/LFeb 202670 servedCity of LakeportNatural background0.20 mg/LMar 20264,762 servedLakeside Mobile EstatesNatural background0.20 mg/LApr 202630 servedLakeside Park AssociationNatural background0.22 mg/LAug 20242,648 servedLakeside WdHuman impact clear3.30 mg/LMar 202535,500 servedLakeview ApartmentsHealth-study range9.50 mg/LFeb 202643 servedLakeview Hills Community Assocpurchased waterNatural background0.20 mg/LAug 2025499 servedLakeview Ranchos Mutual Water CompanyHealth-study range6.40 mg/LApr 2026120 servedLakewood - City, Water Dept.Human impact likely2.70 mg/LFeb 202666,135 servedLamont Public Utility DistHealth-study range7.30 mg/LNov 202519,057 servedLanare Community Services DistNatural background0.12 mg/LJan 2026540 servedLancaster Park Mobile Home ParkNatural background0.20 mg/LMay 202560 servedLancaster Water CompanyHuman impact likely2.80 mg/LAug 202580 servedLand Projects Mutual Water Co.Health-study range6.10 mg/LMar 20262,800 servedLandale Mutual Water CompanyNatural background0.20 mg/LDec 2025550 servedLands of Promise MwcHuman impact likely2.39 mg/LDec 2025174 servedLarkin Woods Mutual Water CompanyNatural background0.20 mg/LJul 202534 servedLas Colinas Road & Water AssnNatural background0.05 mg/LJan 202670 servedLas Cumbres Mutual Water CoNatural background0.05 mg/LFeb 2026402 servedLas Flores Water Co.purchased waterNatural background0.68 mg/LApr 20264,847 servedLas Flores Water WorksHuman impact likely2.22 mg/LFeb 2026191 servedLas Palmas Mobile Home ParkHuman impact clear3.30 mg/LSep 2025120 servedLas Positas Mutual Water CompanyNatural background0.20 mg/LDec 2025200 servedLas Ventanas RanchNatural background0.62 mg/LJan 2025108 servedLas Virgenes MwdNatural background0.39 mg/LMay 202672,602 servedLassen County Water Works District #1Natural background0.05 mg/LApr 2026450 servedLassen Mobile Home ParkNatural background0.20 mg/LApr 202662 servedLassen View Water DistrictHuman impact likely1.50 mg/LMar 202685 servedLaton Community Services DistrictHuman impact likely1.30 mg/LApr 20261,151 servedLaureate Water CompanyHuman impact likely1.00 mg/LDec 2024700 servedLaurel Community LeagueNatural background0.05 mg/LMar 202664 servedLawndale Mutual Water Companypurchased waterNatural background0.20 mg/LSep 2025218 servedLawson S LandingHuman impact likely1.50 mg/LMar 2025946 servedLaytonville County Water DistrictNatural background0.20 mg/LJul 20251,152 servedLazy B Mobilehome ParkHealth-study range8.30 mg/LMay 2026125 servedLazy H Mutual Water CompanyHuman impact clear3.60 mg/LMay 2026142 servedLazy Landing Mobile Home ParkHuman impact likely1.90 mg/LAug 2025250 servedLazy S Mobile RanchHuman impact likely1.90 mg/LSep 202573 servedLe Grand Comm Services DistHuman impact clear3.10 mg/LNov 20251,739 servedLeafwood Community WaHealth-study range5.00 mg/LMar 202664 servedLeavitt Lake CsdNatural background0.90 mg/LApr 2026950 servedLebec County Water DistrictHealth-study range6.30 mg/LMay 20261,379 servedLee Vining Public Utility DistrictNatural background0.07 mg/LAug 2024672 servedLeisure Acres Mutual Water CompanyNatural background0.20 mg/LNov 202445 servedLeisure Lake Mobile EstatesHuman impact likely1.50 mg/LAug 2025325 servedLeisure Mobile Home ParkHuman impact likely2.90 mg/LMar 2026410 servedLeisure Pines Mutual Water CoHuman impact clear3.60 mg/LAug 2025340 servedLemon Cove Water CompanyAbove the federal limit16.90 mg/LApr 2026109 servedCity of LemooreNatural background0.12 mg/LMar 202627,185 servedLerdo Sheriff S FacilityNatural background0.12 mg/LJan 20262,800 servedLiberty -YermoHuman impact likely1.90 mg/LMay 2026861 servedLiberty Park Water AssociationHuman impact likely2.88 mg/LFeb 202685 servedLiberty Utilities (Av Ranchos) Corp.Human impact clear4.70 mg/LMay 202664,469 servedLiberty Utilities - Bellflower-NorwalkHuman impact clear3.60 mg/LMay 202672,624 servedLiberty Utilities - ComptonNatural background0.20 mg/LFeb 202626,371 servedLiberty Utilities - LynwoodNatural background0.20 mg/LMar 202624,701 servedLiberty Utilities - Mesa Crestpurchased waterNatural background0.68 mg/LApr 20261,619 servedLiberty-Bellview HeightsNatural background0.12 mg/LMay 2025155 servedLichau Hylands Mutual Water CompanyHuman impact likely2.30 mg/LMar 202656 servedLife Water Co-OpHuman impact likely1.40 mg/LMay 202635 servedLili Valley Water Co.Natural background0.20 mg/LDec 202599 servedLily of The Valley Mobile VillageHuman impact likely2.30 mg/LOct 2025657 servedLimoneira Ranch #1purchased waterHuman impact likely2.70 mg/LAug 20251,187 servedLincoln Avenue Water Co.Human impact likely2.60 mg/LMay 202616,088 servedLincoln Chan-Home RanchNatural background0.20 mg/LMar 202533 servedLinda County Water DistrictNatural background0.20 mg/LJul 202521,654 servedLinda Falls Terrace MutualNatural background0.72 mg/LJan 202635 servedLinda Vista Mutual Water CoNatural background0.77 mg/LJan 202690 servedLinden County Water DistrictNatural background0.79 mg/LDec 20251,784 servedLingate Lane Mutual Water CompanyHuman impact likely2.40 mg/LDec 202555 servedLinnell Farm Labor CenterHuman impact likely1.90 mg/LNov 2025694 servedLittle Avenue Water SystemHuman impact likely1.88 mg/LApr 202653 servedLittle Baldy WaterNatural background0.41 mg/LDec 202355 servedLittle Bear Water CompanyHuman impact likely1.10 mg/LMay 20262,327 servedLittle Lake Mobile Home ParkHuman impact likely1.80 mg/LAug 202538 servedLittle Potato Slough MutualNatural background0.40 mg/LDec 20251,510 servedLittle Valley CsdNatural background0.40 mg/LApr 202670 servedLittlerock Creek Irrigation Dist.Human impact likely2.40 mg/LApr 20263,040 servedCity of Live OakHealth-study range7.59 mg/LMay 20269,285 servedLive Oak Acres Mwc Inc.Human impact likely1.18 mg/LApr 202680 servedLive Oak Creek Mutual Water CompanyAbove the federal limit12.00 mg/LFeb 202630 servedLive Oak Springs Water SystemHuman impact clear4.00 mg/LJan 2026317 servedCity of Livermorepurchased waterHuman impact clear4.06 mg/LMay 202638,892 servedCity of LivingstonHealth-study range7.90 mg/LMar 202614,894 servedLlano Del Rio Water CompanyNatural background0.20 mg/LJul 2025545 servedLlano Mutual Water Companypurchased waterNatural background0.20 mg/LJul 2025245 servedLoch Haven Mutual Water CompanyNatural background0.20 mg/LMay 202526 servedLoch Lomond Mutual Water CoNatural background0.20 mg/LDec 2025693 servedLocke Water Works Co [Sws]Natural background0.20 mg/LMar 202680 servedLockeford Community Serv. Dist.Human impact likely1.20 mg/LMar 20263,572 servedLockeford Mobile Home Park Wtr SysHuman impact clear3.90 mg/LJul 2025123 servedCity of LodiHealth-study range5.70 mg/LMay 202668,272 servedLodi HomesNatural background0.80 mg/LJan 202639 servedLodi Lake Mobile Home ParkNatural background0.20 mg/LMar 2026104 servedCity of Loma LindaHealth-study range8.10 mg/LMay 202625,129 servedLoma Linda UniversityHealth-study range8.00 mg/LMay 202615,368 servedLoma Rica Water CompanyHuman impact likely1.90 mg/LOct 2025200 servedLomas Del Sol MwsHuman impact clear3.80 mg/LMar 202693 servedLomita-City, Water Dept.Natural background0.20 mg/LFeb 202520,256 servedLompoc-City Water Utility DivNatural background0.20 mg/LMay 202640,473 servedLondon Community Serv DistHuman impact likely1.80 mg/LJan 20262,134 servedLone Pine MhpHealth-study range5.00 mg/LApr 202664 servedLone Pine Mutual Water CompanyHuman impact likely1.20 mg/LMay 202665 servedLong Barn Property OwnersNatural background0.20 mg/LOct 202597 servedLong Beach Utilities DepartmentNatural background0.32 mg/LMar 2025466,772 servedLong Canyon Water Company Corp.Natural background0.41 mg/LAug 2025122 servedLopez ProjectNatural background0.20 mg/LMay 20261,569 servedLos Alamos Community Services DistrictHuman impact clear4.90 mg/LMay 20261,534 servedLos Angeles Cwwd 21-Kagel Canyonpurchased waterHuman impact likely1.29 mg/LApr 2026708 servedLos Angeles Cwwd 29 & 80-Malibupurchased waterHuman impact likely1.29 mg/LApr 202632,348 servedLos Angeles Cwwd 36-Val VerdeNatural background0.65 mg/LMar 20256,376 servedLos Angeles Cwwd 37-ActonHealth-study range6.50 mg/LJun 20264,805 servedLos Angeles Cwwd 40 Reg 4 & 34 LancasterHealth-study range8.20 mg/LMay 2026208,129 servedLos Angeles Cwwd 40, R 24,27,33-PearblsmNatural background0.69 mg/LMar 202411,509 servedLos Angeles Cwwd 40, Reg. 35-N.E. L.A.Natural background0.74 mg/LJan 2025612 servedLos Angeles Cwwd 40, Reg. 38-Lake LaHuman impact likely2.00 mg/LApr 202612,568 servedLos Angeles Cwwd 40, Reg. 39-Rock CreekNatural background0.27 mg/LMay 2025994 servedLos Angeles, City of - Power Plant #1Natural background0.05 mg/LSep 202529 servedLos Angeles, City of - Power Plant #2Natural background0.05 mg/LSep 202544 servedLos Angeles-City, Dept. of Water & PowerHuman impact likely1.29 mg/LApr 20267,751,132 servedCity of Los BanosHealth-study range9.90 mg/LApr 202647,419 servedLos Carneros MwaNatural background0.05 mg/LJul 202570 servedLos Madrones MwcNatural background0.05 mg/LDec 202436 servedLos Molinos Comm. Services Dist.Human impact likely1.70 mg/LMay 20261,450 servedLos Osos Community Services DistrictHuman impact clear4.40 mg/LMay 20267,086 servedLos Prietos ComplexNatural background0.20 mg/LJun 2025845 servedLos Ranchos De Uvas Water CompanyHuman impact clear3.20 mg/LDec 202558 servedLos Robles Mobile Home EstatesHuman impact clear3.20 mg/LJan 2026420 servedLos Tules Mutual Water CompanyNatural background0.20 mg/LNov 2025238 servedLost Hills Utility DistrictNatural background0.33 mg/LMay 20262,370 servedLower Lake County Water DistrictHuman impact clear4.90 mg/LMar 20261,326 servedLower Rock Creek Mutual Water Co.Natural background0.10 mg/LDec 2025310 servedCity of LoyaltonNatural background0.07 mg/LMar 2025983 servedLsid - TonyvilleHealth-study range9.30 mg/LApr 2026500 servedLsid-Strathmore Systempurchased waterHuman impact clear4.30 mg/LMay 2026500 servedLucerne Valley MwcNatural background0.73 mg/LOct 2025228 servedLucerne Vista MwcNatural background0.60 mg/LDec 2025224 servedLukins Brothers Water CompanyNatural background0.24 mg/LFeb 20253,277 servedLundy Mutual Water CompanyNatural background0.12 mg/LDec 202570 servedLupin LodgeNatural background0.05 mg/LNov 2025300 servedLynwood Park Mutual Water Co.Human impact likely1.60 mg/LOct 20251,500 servedLynwood-City, Water Dept.Human impact likely1.60 mg/LApr 202666,967 servedLytle Springs WcHuman impact likely1.00 mg/LJul 2025475 served
M
Madera Co Cmd19-ParkwoodHuman impact clear3.40 mg/LFeb 20261,637 servedMadera Co Csa 22C Gunner RanchHuman impact likely2.30 mg/LFeb 20263,050 servedMadera Co Md10A-Madera RanchosHuman impact clear3.60 mg/LMay 20253,172 servedMadera Co Sa1-Indian LakesNatural background0.20 mg/LMay 20261,562 servedMadera Co Sa3-ParksdaleHuman impact clear3.00 mg/LFeb 20261,789 servedMadera Mh & Rv ParkHuman impact likely1.70 mg/LMay 2026450 servedMadera Valley Water CompanyHuman impact likely1.60 mg/LJan 20266,494 servedMadison Service DistHealth-study range7.50 mg/LMar 2026876 servedMadrone Mutual Water CompanyNatural background0.20 mg/LJun 202576 servedMagic Mountain Mutual Water CompanyNatural background0.20 mg/LDec 2025221 servedMagnolia Mutual WaterNatural background0.12 mg/LFeb 202690 servedMaher Mutual Water CompanyHuman impact likely2.40 mg/LAug 2025140 servedMaher Rd Ws #05Human impact likely2.40 mg/LAug 202548 servedMajestic Pines Community SdNatural background0.10 mg/LJan 20261,768 servedMammoth CwdNatural background0.21 mg/LSep 20258,234 servedMammoth Pool Mobile Home ParkHealth-study range5.36 mg/LJan 202630 servedManhattan Beach-City, Water Dept.Natural background0.12 mg/LFeb 202632,697 servedCity of MantecaHealth-study range7.20 mg/LApr 202684,928 servedManzanita Hills WaHuman impact clear4.70 mg/LApr 202675 servedMapache Trailer ParkHealth-study range7.10 mg/LAug 2025275 servedMarchi Central FarmHuman impact clear3.70 mg/LJun 202550 servedMaria Lane Mutual Water Companypurchased waterNatural background0.20 mg/LMar 202642 servedMariana Ranchos CwdNatural background0.73 mg/LMay 20261,502 servedMarin Municipal Water DistrictNatural background0.20 mg/LApr 2026186,895 servedMarina Coast Water DistrictHealth-study range5.10 mg/LApr 202638,377 servedMarina Mobile ManorNatural background0.20 mg/LJul 202575 servedMariposa Pines MutualNatural background0.12 mg/LDec 2025284 servedMariposa Public Utility DistHuman impact likely2.10 mg/LSep 20252,000 servedMark West Acres MwcNatural background0.20 mg/LMar 202661 servedMark West Meadows Mutual WaterNatural background0.20 mg/LApr 202620 servedMarkleeville Water Co.Natural background0.01 mg/LJul 2025175 servedMarquez RentalNatural background0.60 mg/LApr 202550 servedMartin'S Mobile Home CourtHealth-study range5.70 mg/LMar 202660 servedCity of MartinezNatural background0.28 mg/LFeb 202630,997 servedMartinez ApartmentsAbove the federal limit10.60 mg/LApr 202626 servedMary Lou Mobile Home ParkHuman impact clear4.80 mg/LMay 202668 servedMaurland Manor Water Systempurchased waterHuman impact clear4.20 mg/LMay 202692 servedMaxwell Public Utility DistrictNatural background0.19 mg/LJun 20251,175 servedMaywood Mobile Home ParkHealth-study range5.70 mg/LFeb 2026140 servedMaywood Mutual Water Co. #1Natural background0.69 mg/LApr 20265,500 servedMaywood Mutual Water Co. #2Natural background0.20 mg/LOct 20256,349 servedMaywood Mutual Water Co. #3Human impact likely2.20 mg/LApr 20266,059 servedMaze Blvd Mobilehome ParkHuman impact clear3.40 mg/LSep 202536 servedMc Clellan MhpNatural background0.20 mg/LMar 2026700 servedMccloud C.S.D.Natural background0.14 mg/LApr 20261,317 servedMccoy Rd Ws #05Above the federal limit11.70 mg/LJun 202692 servedCity of McfarlandHealth-study range7.50 mg/LMar 202614,161 servedMckinney Water DistrictNatural background0.20 mg/LSep 2025853 servedMd 05 Mountain RanchesHealth-study range5.10 mg/LApr 2026239 servedMd 07 Marina View HeightsNatural background0.20 mg/LMay 2026200 servedMd 08 North Fork Water SystemNatural background0.20 mg/LJul 2025264 servedMd 24 Teaford Meadow LakesNatural background0.20 mg/LJul 2025150 servedMd 28 Ripperdan Self HelpHuman impact clear4.90 mg/LApr 202648 servedMd 33 FairmeadHuman impact clear3.00 mg/LApr 2025568 servedMd 36 Eastin ArcolaHuman impact clear3.70 mg/LApr 202584 servedMd 37 La VinaHuman impact likely2.10 mg/LFeb 2026350 servedMd 40 Sunset Ridge EstatesNatural background0.20 mg/LApr 2025150 servedMd 42 Still MeadowNatural background0.42 mg/LMar 2026100 servedMd 43 Miami Creek KnollsNatural background0.40 mg/LMar 2026100 servedMd 46 Ahwahnee ResortsHuman impact likely1.90 mg/LMar 2026300 servedMd 58 Sierra HighlandsNatural background0.20 mg/LJul 202575 servedMd 60 Dillon EstatesNatural background0.40 mg/LMar 2026150 servedMd 63 Meadow Springs RanchNatural background0.12 mg/LMar 2026300 servedMd 73 Quartz MountainNatural background0.12 mg/LMar 2026375 servedMd 85 ValetaHuman impact clear4.40 mg/LApr 202645 servedMd 95 Ranchos WestHuman impact clear3.90 mg/LFeb 2026150 servedMeadow Edge MhpNatural background0.20 mg/LJun 202553 servedMeadow Estates MutualHuman impact likely2.10 mg/LJul 2025100 servedMeadow Lake ApartmentsNatural background0.53 mg/LDec 202522 servedMeadow Lakes ClubNatural background0.12 mg/LDec 2025240 servedMeadowbrook OaksNatural background0.05 mg/LApr 202550 servedMeadowcreek Mutual Water CompanyNatural background0.33 mg/LSep 2025764 servedMeadowlark Ranches Mutual Water CompanyHealth-study range7.40 mg/LFeb 2026150 servedMeadowridge Mutual Water CoNatural background0.80 mg/LFeb 202642 servedMeadows of The Kern Mutual Water CompanyHuman impact clear3.70 mg/LAug 202532 servedMecchi Water CompanyHuman impact clear4.40 mg/LSep 2025104 servedMeiners Oaks CwdHuman impact clear4.50 mg/LMay 20264,200 servedMel Mar Mutual Water CoHuman impact likely1.06 mg/LApr 2026300 servedMelita Heights Mutual Water CompanyNatural background0.20 mg/LJul 202564 servedMelody Woods Water CompanyHuman impact likely1.40 mg/LJan 2026168 servedMenlo Park Municipal WaterHuman impact likely1.10 mg/LMar 202522,362 servedCity of MercedHuman impact likely1.70 mg/LMay 202693,692 servedMerrill Gardens Iris Canyon WsNatural background0.20 mg/LNov 2025161 servedMerry Mountain MutualNatural background0.20 mg/LSep 202590 servedMesa Del Toro MwcNatural background0.05 mg/LJun 202590 servedMesa Dunes Mobile Home EstatesHealth-study range8.50 mg/LMay 2026600 servedMesa Hills Mutual Water CompanyHealth-study range5.80 mg/LFeb 202634 servedMesa Water DistrictNatural background0.05 mg/LMar 2026110,000 servedMetropolitan Water Dist. of So. Cal.Natural background0.68 mg/LApr 20260 servedMettler County Water DistrictHuman impact likely1.30 mg/LMar 202690 servedMettler Valley MutualHuman impact clear3.00 mg/LAug 2025160 servedMeyers Water Co.Natural background0.05 mg/LJun 2025250 servedMhc Tt Inc. (Dba Pio Pico)Natural background0.56 mg/LMar 2026828 servedMi Wuk Heights MwcNatural background0.97 mg/LApr 2026445 servedMi Wuk Village Mut Wtr CoHuman impact likely1.63 mg/LFeb 20262,163 servedMichele Mutual Water CompanyNatural background0.20 mg/LApr 202693 servedMid-Peninsula Water Districtpurchased waterNatural background0.42 mg/LJun 202530,609 servedMiddle Road Mutual Water Copurchased waterHuman impact likely2.70 mg/LAug 2025134 servedMidland SchoolHuman impact likely1.80 mg/LJun 2025150 servedMidway City Mutual WcNatural background0.30 mg/LMay 20261,305 servedMidway Heights C. W. D.Natural background0.20 mg/LMar 20261,491 servedMil Potrero MwcHuman impact likely1.10 mg/LNov 20252,200 servedMill Creek Mscpurchased waterHuman impact likely2.70 mg/LJun 2026315 servedCity of Millbraepurchased waterNatural background0.42 mg/LJun 202522,795 servedMillview County Water DistrictHuman impact likely1.80 mg/LSep 20255,500 servedCity of Milpitaspurchased waterNatural background0.50 mg/LMay 202681,773 servedMilton Road Water CompanyNatural background0.20 mg/LNov 202544 servedMineral County Water DistrictNatural background0.05 mg/LFeb 2026634 servedMineral Mountain Mutual WaterNatural background0.20 mg/LSep 202567 servedMira Monte Water Co.Natural background0.54 mg/LFeb 2026145 servedMirasol Company Water SystemNatural background0.05 mg/LAug 202526 servedMireval Improvement Associationpurchased waterNatural background0.20 mg/LMar 202660 servedMission Highlands Mutual Water Co.Human impact likely1.50 mg/LDec 2025150 servedMission Hills CsdHuman impact likely2.20 mg/LOct 20253,600 servedMission Springs Conference CenterNatural background0.05 mg/LSep 20251,310 servedMission Springs WdHuman impact likely1.40 mg/LApr 202643,484 servedMitchell'S Avenue E Mobile Home ParkNatural background0.12 mg/LApr 202624 servedMitchells Camp Family Assoc.Human impact likely1.20 mg/LAug 2025125 servedMobile Home EstatesHuman impact likely2.00 mg/LAug 2025210 servedMobile Villas Trailer ParkHealth-study range5.80 mg/LMay 2026130 servedModern Village MwcHuman impact clear3.59 mg/LApr 202685 servedCity of ModestoHealth-study range6.50 mg/LMay 2026218,771 servedCity of Modesto - Central Turlockpurchased waterHealth-study range6.27 mg/LNov 2025119 servedCity of Modesto - Del RioHuman impact clear3.90 mg/LMay 20261,327 servedCity of Modesto - GraysonHuman impact likely1.70 mg/LMay 2026914 servedCity of Modesto - North TurlockHealth-study range9.00 mg/LApr 2026172 servedCity of Modesto - SalidaHealth-study range5.80 mg/LMar 202614,537 servedCity of Modesto - South TurlockHuman impact likely1.10 mg/LJul 20251,099 servedCity of Modesto - Walnut ManorHuman impact likely2.40 mg/LApr 2026175 servedModesto Irrigation DistrictNatural background0.12 mg/LAug 202523 servedMojave PudHuman impact clear3.10 mg/LMar 20264,699 servedMojave Water AgencyNatural background0.45 mg/LJun 20250 servedMokelumne Mobile Senior ParkNatural background0.20 mg/LMar 202655 servedMondavi Farm Worker CenterNatural background0.93 mg/LMay 202666 servedMonroe/Leinberger Cntr - WatersHuman impact clear4.80 mg/LMay 2025800 servedMonrovia-City, Water Dept.Human impact likely1.70 mg/LJun 202637,931 servedMontara Water And Sanitary DistrictHealth-study range5.00 mg/LJun 20256,078 servedMonte Sereno Mutual Benefit WaterNatural background0.20 mg/LDec 202465 servedMonte Shasta M.W.C.Natural background0.77 mg/LMay 2026150 servedMonte Vista Christian SchoolHuman impact clear3.10 mg/LJan 20261,051 servedMonte Vista WdHuman impact likely2.40 mg/LMay 202656,017 servedMontebello Land & Water Co.Human impact likely2.70 mg/LFeb 202626,554 servedMontecito Sea MeadowsNatural background0.50 mg/LMay 202670 servedMontecito Water DistHuman impact clear3.70 mg/LMay 202611,962 servedMonterey Bay AcademyHuman impact likely2.00 mg/LJan 2026400 servedMonterey Dunes MwaNatural background0.05 mg/LDec 2025243 servedMonterey Park Tract Csdpurchased waterHealth-study range6.24 mg/LMay 2026186 servedMonterey Park-City, Water Dept.Human impact likely2.50 mg/LMay 202662,183 servedMoon Valley Water SystemNatural background0.20 mg/LJan 2026691 servedMoonstone Heights MwaHuman impact clear3.30 mg/LMay 202533 servedMorada Acres Water SystemHuman impact likely2.10 mg/LFeb 2026105 servedMorada Estates N Pws #46Human impact clear4.20 mg/LFeb 2026426 servedMorada Estates PwsHuman impact clear4.20 mg/LFeb 2026290 servedMorada Manor Water SystemHuman impact likely1.20 mg/LFeb 2026112 servedMoraga Heights Mutual WaterNatural background0.20 mg/LFeb 202666 servedMorehead ParkHuman impact likely2.10 mg/LJun 2025300 servedCity of Morgan HillHealth-study range5.40 mg/LFeb 202647,374 servedMorningside Mobilehome ParkHuman impact likely2.04 mg/LDec 202567 servedMoro Cojo MwaHealth-study range7.40 mg/LMay 202667 servedMoro Rd Ws #09Natural background0.05 mg/LMay 2026210 servedMorro Bay Pw Dept - Water DivisionHuman impact likely1.90 mg/LMay 202613,757 servedMorro Rock Mutual Water CoNatural background0.20 mg/LAug 20252,181 servedMorton'S Warm Springs / Sonoma SpringsNatural background0.20 mg/LAug 202559 servedMoss Mobile ManorHuman impact likely1.70 mg/LOct 2025290 servedMoulton Niguel Water DistrictHuman impact likely1.40 mg/LFeb 2026170,236 servedMount Madonna CenterNatural background0.05 mg/LMay 2026170 servedMount Toro Ranchos MwaNatural background0.05 mg/LDec 202545 servedMountain Center CafeHuman impact likely2.10 mg/LMar 202677 servedMountain Gate C.S.D.Human impact likely2.68 mg/LJul 20252,227 servedCity of Mountain HouseNatural background0.40 mg/LApr 202624,948 servedMountain Meadows MwcNatural background0.55 mg/LOct 2025505 servedMountain Mesa WcHealth-study range5.50 mg/LMay 2026777 servedMountain of Attention WaterNatural background0.20 mg/LJan 202626 servedMountain Springs Mutual Water CompanyNatural background0.60 mg/LOct 202540 servedMountain Valley Apts & RvpHuman impact likely2.67 mg/LJun 2025131 servedCity of Mountain ViewHealth-study range5.90 mg/LMay 202681,501 servedMountain View DuplexesNatural background0.20 mg/LDec 2025103 servedMountain View MhpHuman impact clear3.70 mg/LNov 202544 servedMountain View Mobile Estates, LlcHuman impact clear3.10 mg/LMay 2025250 servedMountain View Trailer CourtNatural background0.13 mg/LMay 2025320 servedMountain Village Homeowner'S AssocNatural background0.20 mg/LJul 202540 servedMp Mine Operations LlcHealth-study range6.20 mg/LAug 2024626 servedMpwd-Coulterville Csa 1Health-study range5.00 mg/LJan 2026193 servedMt Ararat Mobile Home ParkHuman impact likely1.00 mg/LApr 202642 servedMt Baldy Homeowners Assn.Natural background0.41 mg/LJan 20261,700 servedMt. Eden Mutual Water Companypurchased waterNatural background0.20 mg/LMar 2026165 servedMt. Hermon Association, Inc.Natural background0.20 mg/LApr 20261,176 servedMt. Pleasant Water Users Associationpurchased waterNatural background0.20 mg/LMar 2026300 servedCity of Mt. ShastaNatural background0.16 mg/LJun 20253,642 servedMuir Beach CommunityNatural background0.20 mg/LMar 2026336 servedMulberry MhpHuman impact likely1.50 mg/LOct 2025148 servedMuller Mutual Water Companypurchased waterNatural background0.12 mg/LAug 2025154 servedMurphy Hill Ws #01purchased waterHuman impact clear3.80 mg/LMar 202665 servedMurphy Hill Ws #02Natural background0.80 mg/LJan 202666 servedMurrieta Palms Mobile Home ParkHuman impact likely1.20 mg/LJan 2026237 servedMurrieta/Hernandez FarmsHuman impact likely1.60 mg/LJan 202625 servedMuscoy Mwc No. 1Human impact clear3.70 mg/LAug 202513,000 servedMustang Mutual Water SystemHuman impact likely2.80 mg/LFeb 2026200 servedMustang Springs Mutual WaterNatural background0.62 mg/LJan 202630 servedMyoma Dunes Mutual Water CompanyHuman impact likely1.20 mg/LMay 20269,445 served
N
City of NapaNatural background0.05 mg/LJul 202584,804 servedNapa River RanchNatural background0.20 mg/LFeb 202470 servedNas North Island & Nab Coronadopurchased waterNatural background0.20 mg/LMay 202636,990 servedNasa Ames Research Centerpurchased waterNatural background0.42 mg/LJun 202516,273 servedNavajo MwcNatural background0.20 mg/LJul 2025264 servedNaval Base Ventura County, Point Mugupurchased waterHuman impact likely1.50 mg/LJun 20265,700 servedNaval Base Ventura County, Port HuenemeNatural background0.20 mg/LOct 20258,625 servedNaval Medical Center San Diegopurchased waterNatural background0.20 mg/LMay 20262,981 servedCity of NeedlesHuman impact likely1.70 mg/LApr 20268,766 servedNepenthe WsNatural background0.05 mg/LDec 2025618 servedNevada Id - E. George, Banner MountainNatural background0.20 mg/LDec 202517,154 servedNevada Id - Lake of PinesNatural background0.20 mg/LDec 20256,870 servedNevada Id - Lake WildwoodNatural background0.20 mg/LDec 20259,108 servedNevada Id - Loma RicaNatural background0.20 mg/LDec 202514,072 servedNevada Id - North AuburnNatural background0.20 mg/LDec 20256,870 servedNevada Id - SmartsvilleNatural background0.20 mg/LDec 2025122 servedNew Avenue Mutual Water CompanyHealth-study range6.40 mg/LApr 2026305 servedNew Camaldoli Hermitage WsNatural background0.10 mg/LJan 202644 servedNew Hope Landing General StoreNatural background0.40 mg/LJul 2025125 servedNew Horizons Mobile/Rv ParkNatural background0.20 mg/LMar 202682 servedNewell County Water DistrictNatural background0.12 mg/LOct 2025629 servedCity of Newman-Water DepartmentHealth-study range5.73 mg/LJan 202612,207 servedCity of Newport BeachHuman impact clear3.09 mg/LMay 202668,572 servedNicasio Valley Ranch MutualNatural background0.20 mg/LDec 202536 servedNipomo Comm Services DistHealth-study range7.00 mg/LJun 202613,771 servedNoel Heights-Cal Water Service (Puc)Natural background0.12 mg/LMay 202679 servedNorcal Water WorksHuman impact likely1.50 mg/LNov 202545 servedCity of NorcoNatural background0.20 mg/LNov 202525,068 servedNord Road Water AssociationHuman impact likely1.40 mg/LAug 202532 servedNorris Canyon Property Owners AssnHuman impact clear3.70 mg/LJun 202450 servedNorth Coast County Water Distpurchased waterNatural background0.42 mg/LJun 202538,546 servedNorth Davis MeadowsAbove the federal limit13.00 mg/LMar 2026314 servedNorth Edwards WdHuman impact likely1.10 mg/LNov 20231,105 servedNorth Gualala Water CompanyNatural background0.20 mg/LApr 20262,593 servedNorth Kranenburg WsHealth-study range5.00 mg/LApr 202628 servedNorth Lone Pine Mutual Water CompanyNatural background0.31 mg/LOct 202570 servedNorth Marin Water DistrictNatural background0.20 mg/LSep 202361,691 servedNorth Marin Wd - Pt. ReyesNatural background0.20 mg/LSep 20241,841 servedNorth Muroc Mutual Water Companypurchased waterHuman impact likely1.60 mg/LOct 2024270 servedNorth Oaks Mutual Water CoHuman impact likely1.90 mg/LApr 2025234 servedNorth Peak Mutual Water CompanyNatural background0.90 mg/LMar 2025298 servedNorth Shore Estates WsNatural background0.30 mg/LDec 202560 servedNorth Shore MwcNatural background0.20 mg/LJan 20267 servedNorth Star Mobile Home ParkHealth-study range7.50 mg/LMar 2026221 servedNorth Tahoe Pud - Carnelian WoodsNatural background0.20 mg/LSep 2025524 servedNorth Tahoe Pud - Dollar Covepurchased waterNatural background0.22 mg/LDec 2025507 servedNorth Trails Mutual Water CompanyHealth-study range5.70 mg/LApr 2026100 servedNorth Yuba Water DistrictNatural background0.20 mg/LSep 20252,772 servedNorthcrest Mobile Home ParkHuman impact likely1.50 mg/LApr 2026250 servedNorthstar Csd - Martis ValleyNatural background0.20 mg/LAug 20254,493 servedNorwalk - City, Water Dept.Human impact likely2.30 mg/LJul 202520,283 servedNps - Death Valley, Furnace CreekNatural background0.38 mg/LJan 2026150 servedNps - Death Valley, Stovepipe WellsHuman impact likely1.50 mg/LOct 2024175 servedNps Ggnrapurchased waterNatural background0.20 mg/LApr 202618,447 servedNps Prns - BeachesHuman impact likely1.80 mg/LMar 20261,560 servedNuevo Water CompanyHuman impact clear4.50 mg/LJun 20266,733 servedNyeland Acres Mutual Water CoHuman impact clear3.60 mg/LFeb 2026975 served
O
O'Connor Tract Co-Operative Water Co.Natural background0.87 mg/LAug 20252,789 servedOak Creek Mobile Home ParkNatural background0.12 mg/LOct 2025370 servedOak Dell ParkNatural background0.05 mg/LMay 2026104 servedOak Glen Domestic WaterNatural background0.68 mg/LOct 2025180 servedOak Glen RetreatHuman impact likely1.40 mg/LDec 2025576 servedOak Grove Mobile Home ParkHealth-study range8.00 mg/LMay 2026109 servedOak Haven AssociationNatural background0.20 mg/LApr 2026120 servedOak Heights W & R Co IncAbove the federal limit11.50 mg/LMay 2026105 servedOak Knolls Mutual Water CompanyAbove the federal limit13.00 mg/LMay 2026123 servedOak Manor WsHuman impact likely1.80 mg/LJan 202692 servedOak Trail EstatesNatural background0.20 mg/LFeb 2026211 servedOak Trail RanchHuman impact likely2.40 mg/LFeb 2026102 servedOak Valley Acres P.O.A.Human impact likely1.60 mg/LApr 202641 servedCity of OakdaleHuman impact clear3.90 mg/LJul 202523,235 servedOakhurst Mobile Home EstatesHuman impact likely2.70 mg/LJan 2026138 servedOaklane Mobile Village, Llc.Human impact clear3.03 mg/LApr 202675 servedOakley Mutual Water CompanyNatural background0.53 mg/LJul 2025170 servedOakmont Water Systempurchased waterNatural background0.20 mg/LMar 202661 servedOakvale ParkHuman impact clear4.90 mg/LSep 2024260 servedOasis InvestmentsHuman impact clear4.50 mg/LSep 202575 servedOasis Property Owners AssociationHuman impact likely1.00 mg/LAug 2025100 servedOccidental Community Services DistrictNatural background0.20 mg/LDec 2025533 servedOcean'S Edge EstatesHealth-study range5.00 mg/LMay 2026250 servedOceano Comm Services Dist.Natural background0.20 mg/LMay 20267,601 servedCity of OceansideNatural background0.41 mg/LMay 2026171,483 servedOcotillo Mutual Water CoHuman impact likely2.70 mg/LJun 2025150 servedOcotillo Oasis, LlcHuman impact likely1.40 mg/LMay 202696 servedOdd Fellows Recreation ClubNatural background0.51 mg/LJan 2026757 servedOdiyan Buddhist Retreat CenterHuman impact likely1.40 mg/LMar 202535 servedOid #22 - Williams TractHuman impact likely1.72 mg/LSep 2025150 servedOid #45Human impact likely1.39 mg/LDec 2025144 servedOid #46 - Sunset OaksHuman impact likely2.74 mg/LDec 2025269 servedOid #51 - Sunset Oaks #10Human impact clear3.20 mg/LDec 2025287 servedOid-Oakdale Rural Water System #1Health-study range7.72 mg/LDec 20251,570 servedOildale MwcHuman impact clear4.40 mg/LNov 202444,899 servedOjai Water SystemHuman impact clear4.50 mg/LFeb 20266,801 servedOkieville Highland Acres MwcNatural background0.12 mg/LJan 2026300 servedOku IncorporatedNatural background0.05 mg/LJan 202635 servedOld River Mutual Water CompanyHuman impact clear4.50 mg/LJan 2026130 servedOlive Dell RanchNatural background0.98 mg/LJan 2025350 servedOlive Lane Mobilehome ParkHealth-study range7.90 mg/LNov 2025153 servedOlivehurst Public U.D.Natural background0.20 mg/LMay 202616,595 servedOlivenhain MwdNatural background0.05 mg/LApr 202586,458 servedOlivet UniversityNatural background0.20 mg/LMar 2026212 servedOlympia MobilodgeNatural background0.20 mg/LMay 2025450 servedOlympic Valley MwcNatural background0.07 mg/LOct 2025756 servedOlympic Valley PsdNatural background0.20 mg/LAug 20251,165 servedOntario Municipal Utilities CompanyHuman impact clear3.90 mg/LJun 2026185,010 servedCity of OrangeHuman impact clear4.34 mg/LApr 2026120,770 servedOrange Vale Water CompanyHuman impact clear3.50 mg/LApr 202616,861 servedOrchard Dale Water Districtpurchased waterHuman impact clear3.60 mg/LApr 202625,000 servedOrchard Ln Ws #02Human impact likely2.30 mg/LOct 202532 servedCity of OrlandHuman impact clear4.28 mg/LMay 20268,298 servedOrland Estates Mobile H.P.Human impact clear4.80 mg/LSep 2025244 servedOrland Mobile H.P.Human impact clear4.72 mg/LApr 2025178 servedOroville Mobile Home ParkHuman impact likely1.00 mg/LJul 202576 servedOrtega Oaks Rv Park&CampgroundHealth-study range6.40 mg/LJun 2026180 servedOrwood ResortNatural background0.20 mg/LJul 2025350 servedOtay Water Districtpurchased waterNatural background0.46 mg/LMay 2026238,008 servedOutlook WaNatural background0.40 mg/LJan 202635 servedOwens Peak SouthHuman impact likely1.60 mg/LJul 202545 servedOwens Peak WestHuman impact likely1.60 mg/LJan 202679 servedOwens Valley Water Resources, Inc.Natural background0.31 mg/LDec 2025311 servedOxnard Water DeptHuman impact likely1.20 mg/LMay 2026200,232 served
P
Pacific Union CollegeHuman impact clear3.30 mg/LJun 20251,958 servedPadre Dam Mwdpurchased waterNatural background0.46 mg/LMay 202693,980 servedPage Avenue Mutual Water CompanyHealth-study range6.41 mg/LOct 2024119 servedPainted CaveNatural background0.20 mg/LJan 2025160 servedPalisades, TheNatural background0.60 mg/LAug 202562 servedPalm Ranch Irrigation Dist.Health-study range7.70 mg/LMay 20265,507 servedPalm Springs CrestHuman impact likely1.30 mg/LJun 2025399 servedPalmdale Water Dist.Natural background0.20 mg/LApr 2026126,804 servedPalms River ResortHuman impact clear4.80 mg/LFeb 2026531 servedCity of Palo AltoHuman impact likely2.70 mg/LSep 202567,231 servedPalo Alto Park Mutual Water CompanyNatural background0.92 mg/LDec 20252,900 servedPalo Verde County Water Dist.Natural background0.20 mg/LMar 2025410 servedPalomar Christian Conference CenterNatural background0.20 mg/LNov 202513,050 servedPalomar Mountain Mutual Water Co.Natural background0.20 mg/LJan 2026193 servedPalomar ObservatoryNatural background0.20 mg/LDec 20254,416 servedPalomino Lakes Mutual Water Co.Natural background0.85 mg/LAug 2025300 servedPanama Road Property Owners AssocHuman impact clear4.60 mg/LJul 202545 servedPar Country Estates Csa-16Health-study range9.60 mg/LMay 2026178 servedParadise Irrigation DistrictNatural background0.20 mg/LMay 20259,142 servedParadise Lake Mutual Water Co.Human impact clear4.70 mg/LApr 2026213 servedParadise Mobile EstatesHuman impact likely2.70 mg/LJul 2025106 servedParadise Ranch MhpNatural background0.70 mg/LDec 2023360 servedParadise Rd Ws #05Human impact clear4.50 mg/LJan 202642 servedParadise Rd Ws #09Natural background0.20 mg/LJan 2026206 servedParadise Rd Ws #21Human impact likely1.30 mg/LMar 202648 servedParadise Valley MwcNatural background0.20 mg/LJan 202630 servedParamount - City, Water Dept.Natural background0.20 mg/LJul 202555,200 servedPark Heights Mutual Water CoHuman impact likely2.50 mg/LDec 2025250 servedPark Royal Mutual Water CompanyNatural background0.20 mg/LSep 202575 servedPark West Mutual Water CompanyNatural background0.60 mg/LDec 2025188 servedParkway Lakes Rv ParkHuman impact likely1.20 mg/LDec 2025250 servedCity of ParlierHuman impact clear3.80 mg/LApr 202614,576 servedPasadena Water And PowerHuman impact clear4.60 mg/LMay 2026164,344 servedCity of Paso Robles Water DivisionHuman impact likely2.00 mg/LFeb 202631,176 servedCity of PattersonHuman impact clear3.40 mg/LMay 202624,977 servedPauma Valley Water CompanyAbove the federal limit12.00 mg/LApr 2026185 servedPcwa - WeimarNatural background0.20 mg/LAug 20251,689 servedPedrazzi MwcHuman impact clear3.30 mg/LJun 2025273 servedPenngrove Water Company (Puc)purchased waterNatural background0.20 mg/LSep 20251,742 servedPesante Rd Ws #02Natural background0.80 mg/LMar 2026120 servedPesante Rd Ws #06Natural background0.05 mg/LDec 202550 servedCity of PetalumaNatural background0.20 mg/LNov 202560,781 servedPeter Pitchess Honor Rancho Detn. CtrHuman impact likely1.70 mg/LOct 20257,000 servedPhelan Pinon Hills CsdHuman impact clear3.30 mg/LApr 202624,285 servedPhoenix Lake Estates Cc MwcHuman impact likely1.04 mg/LJan 20261,168 servedPico Rivera - City, Water Dept.Natural background0.20 mg/LDec 202440,600 servedPico WdNatural background0.44 mg/LMay 202622,051 servedPier 1900 Homeowner'S AssociationNatural background0.20 mg/LDec 2025152 servedPierpoint Springs Water Co.Natural background0.20 mg/LOct 202546 servedPike Ranch Mutual Water CoNatural background0.72 mg/LFeb 202574 servedPine Cove Rv ParkNatural background0.12 mg/LMar 2026223 servedPine Cove Water DistrictNatural background0.34 mg/LNov 20251,540 servedPine Creek VillageHuman impact likely1.20 mg/LMar 2025240 servedPine Grove Mobile Home ParkHuman impact clear4.50 mg/LApr 2026142 servedPine Hill Terrace Mobile Home ParkNatural background0.20 mg/LAug 202527 servedPine Hills Mutual Water CompanyNatural background0.20 mg/LDec 2025760 servedPine Mountain Mutual Water Co.Human impact likely1.30 mg/LDec 2025310 servedPine Ridge Park EstatesNatural background0.20 mg/LMay 202644 servedPine St Ws #01Natural background0.20 mg/LAug 202536 servedPine Tree Lane Mutual Water CoNatural background0.12 mg/LAug 202580 servedPine Valley Bible Conference CenterHuman impact likely1.30 mg/LNov 2025255 servedPine Valley Mutual WcHuman impact clear3.00 mg/LSep 20252,645 servedPine Valley Trailer ParkNatural background0.20 mg/LApr 2026200 servedPinebrook Community Water WellNatural background0.14 mg/LFeb 202668 servedPinecrest Permittees AssnNatural background0.20 mg/LDec 20251,298 servedPineview Mobile Home ParkNatural background0.70 mg/LJul 202580 servedPinon Pines MwcHuman impact likely1.60 mg/LMar 2026908 servedPinon Valley Water CompanyNatural background0.05 mg/LFeb 2026112 servedPinyon Crest HoaNatural background0.20 mg/LJan 2026104 servedPinyon Pines County Water DistNatural background0.10 mg/LJan 2026232 servedPioneer Place MwsNatural background0.05 mg/LDec 202564 servedPismo Beach Water DepartmentNatural background0.20 mg/LSep 20258,036 servedCity of PittsburgHuman impact likely1.90 mg/LFeb 202662,500 servedPlacer Csa - SheridanHuman impact likely1.65 mg/LMay 2025653 servedPlacer Cwa - AltaNatural background0.20 mg/LAug 2025748 servedPlacer Cwa - ApplegateNatural background0.20 mg/LAug 2025190 servedPlacer Cwa - Auburn/BowmanNatural background0.20 mg/LAug 202527,294 servedPlacer Cwa - Bianchi Estatespurchased waterNatural background0.03 mg/LNov 2025110 servedPlacer Cwa - ColfaxNatural background0.20 mg/LAug 20253,149 servedPlacer Cwa - FoothillNatural background0.20 mg/LAug 202589,544 servedPlacer Cwa - Monte VistaNatural background0.20 mg/LAug 202546 servedPlanada CsdAbove the federal limit10.50 mg/LMay 20264,164 servedPlantation Mobile Home ParkHuman impact clear3.80 mg/LDec 202522 servedPlantation On The Lake ParkHuman impact likely1.50 mg/LMar 2026897 servedPlaza Mobile Home ParkHuman impact clear3.00 mg/LMay 2025169 servedPleasant Grove MhpHuman impact likely2.50 mg/LJun 2025327 servedPleasant Valley Mutual Water CoNatural background0.20 mg/LApr 20265,000 servedPleasantimes Mutual Water CoNatural background0.20 mg/LMay 2026644 servedCity of PleasantonHuman impact likely2.30 mg/LDec 202576,689 servedPlumas Eureka CsdNatural background0.20 mg/LApr 20261,534 servedPlumas LakeNatural background0.20 mg/LOct 202510,464 servedPoint Arena Water WorksNatural background0.20 mg/LMay 2025459 servedPoint Cabrillo HighlandsHuman impact likely2.60 mg/LNov 202542 servedPoint of View Mutual Water CoHuman impact likely1.40 mg/LJun 202556 servedPomona - City, Water Dept.Health-study range5.60 mg/LJun 2026151,713 servedPond-Derosa Oaks WcNatural background0.90 mg/LDec 2025216 servedPonderosa Basin Mutual Wtr CoNatural background0.20 mg/LFeb 2026798 servedPonderosa CsdNatural background0.20 mg/LMar 2025340 servedPonderosa Mobile Home ParkHuman impact likely2.00 mg/LNov 202552 servedPort Hueneme City Water Deptpurchased waterHuman impact likely1.50 mg/LJun 202621,407 servedPort Hueneme Water AgencyHuman impact likely2.90 mg/LJul 20250 servedCity of PortervilleHealth-study range5.80 mg/LNov 202563,487 servedPorterville - East PlanoHuman impact likely1.50 mg/LMay 202646 servedPorterville Developmental CenterHuman impact clear3.50 mg/LJun 20261,281 servedCity of Portolano current resultlast Jul 20232,100 servedPortola Improvement Association MwcNatural background0.05 mg/LJun 202590 servedPost Ranch Inn WsNatural background0.10 mg/LDec 2025416 servedCity of PowayNatural background0.24 mg/LFeb 202549,888 servedPreserve At Millerton Lake Water SystemHealth-study range7.85 mg/LJan 2026600 servedPrimrose Lane ApartmentsNatural background0.59 mg/LDec 202573 servedPrinces Camp Resort WsNatural background0.20 mg/LSep 2025126 servedPrunedale MwcNatural background0.05 mg/LJan 2026277 servedPsmcsd - Blackie Rd WsHuman impact likely2.30 mg/LMay 202660 servedPsmcsd - Langley/Valle Pacifico WsNatural background0.05 mg/LNov 202581 servedPsmcsd - Moss Landing Harbor WsNatural background0.20 mg/LMay 2026520 servedPsmcsd - NormcoHuman impact clear4.40 mg/LMar 2026928 servedPsmcsd - Springfield WsAbove the federal limit56.20 mg/LMay 2026200 servedPsmcsd - Sunny MesaHuman impact likely1.10 mg/LMay 2026880 servedPsmcsd - Vega Rd Ws #01Natural background0.20 mg/LMar 2026438 servedPsmcsd - Vierra Estates WsHealth-study range8.70 mg/LMay 2026164 servedPuente Housing SolutionsNatural background0.05 mg/LAug 202528 servedPuerta La Cruz Cc #14Human impact likely1.70 mg/LSep 202527 servedPuresource Water, IncNatural background0.05 mg/LJan 2026206 servedPurissima Hills Water Districtpurchased waterNatural background0.42 mg/LJun 20256,245 served
Q
Quail Creek Estates Mutual Water CompanyNatural background0.05 mg/LNov 202555 servedQuartz Hill Water Dist.Health-study range8.40 mg/LMay 202619,100 servedQuiet Oaks Mobile Home ParkHuman impact likely1.50 mg/LMay 2026120 servedQuintette Service Corp WaterNatural background0.20 mg/LApr 202580 servedQvwd-West & East Combined Water SystemNatural background0.12 mg/LSep 2025221 served
R
R Ranch At The LakeNatural background0.05 mg/LNov 202528 servedR-Ranch In The SequoiasNatural background0.60 mg/LSep 2025330 servedR-Wild Horse RanchNatural background0.05 mg/LMar 20261,055 servedR.S. Mutual Water CompanyHealth-study range5.90 mg/LMay 202667 servedRainbird Valley MwcHealth-study range8.80 mg/LApr 2026238 servedRainbow Municipal Wdpurchased waterNatural background0.46 mg/LMay 202623,536 servedRains Creek Water DistrictNatural background0.54 mg/LNov 2025208 servedRambling Hills EstatesNatural background0.90 mg/LAug 202578 servedRamona Municipal Wdpurchased waterNatural background0.46 mg/LMay 202637,047 servedRamona Water CompanyHealth-study range8.10 mg/LApr 2026250 servedRanch Road Estates Mutual Water CompanyNatural background0.20 mg/LMar 202665 servedRancheritos #2Human impact likely1.80 mg/LJan 2026291 servedRancheritos MwcNatural background0.40 mg/LJan 2026487 servedRancho Borromeo MwcHuman impact clear4.20 mg/LJan 2026100 servedRancho California Water DistrictHuman impact likely1.90 mg/LJun 2026146,147 servedRancho Calimesa Mobile Home ParkHuman impact clear4.60 mg/LApr 2026296 servedRancho Carrillo MwcHealth-study range6.40 mg/LApr 2026210 servedRancho Chaparral MwcNatural background0.05 mg/LJan 202658 servedRancho Colina Mobile Home ParkHuman impact clear3.80 mg/LMay 2026249 servedRancho Colorado WsHuman impact likely1.00 mg/LAug 202536 servedRancho CorralitosNatural background0.05 mg/LJan 202687 servedRancho De Lomas Mutual Water CompanyAbove the federal limit12.00 mg/LJul 202535 servedRancho Del Campo Water SystemHealth-study range5.70 mg/LSep 2025290 servedRancho Del Oro MhpHuman impact likely1.50 mg/LJul 202544 servedRancho Del Paradiso-Cal Water Svc (Puc)purchased waterNatural background0.20 mg/LApr 202594 servedRancho Estates Mutual Water Co.Health-study range7.70 mg/LMay 2026200 servedRancho Marcelino WaterHealth-study range6.20 mg/LMay 2026240 servedRancho MarinaNatural background0.20 mg/LMay 2026250 servedRancho Nipomo Water CompanyNatural background0.20 mg/LApr 202544 servedRancho Pauma Mutual WcHealth-study range5.60 mg/LJun 2026899 servedRancho Pino VerdeHuman impact clear4.40 mg/LFeb 202666 servedRancho Robles Mutual Water CompanyHealth-study range7.30 mg/LAug 2025103 servedRancho Salinas MbwcNatural background0.23 mg/LFeb 202650 servedRancho San AndreasNatural background0.90 mg/LJun 2025200 servedRancho San Joaquin MwcNatural background0.05 mg/LJul 2025914 servedRancho San Joaquin Water SysHealth-study range6.00 mg/LFeb 2026172 servedRancho Santa Teresa Mw Co.Human impact clear4.50 mg/LMar 2026102 servedRancho Seco Inc. Water SystemNatural background0.05 mg/LJul 202533 servedRancho Sespe Workers Imp AssocHuman impact likely1.90 mg/LSep 2025600 servedRancho YnecitaHuman impact likely2.10 mg/LMar 2025129 servedRanchos Del RioNatural background0.05 mg/LAug 202562 servedRand Communities Water DistrictHealth-study range6.60 mg/LJul 2025303 servedRandal'S Ranchette Mutual Water CompanyNatural background0.20 mg/LJun 2025200 servedRandall-Bold Water Treatment PlantNatural background0.68 mg/LJan 20261 servedRau DairyNatural background0.12 mg/LDec 2025105 servedRawhide Mutual Water CompanyHuman impact likely1.20 mg/LJul 2025269 servedRawson Creek Mutual Water CompanyHuman impact likely1.20 mg/LDec 202590 servedRay Water CompanyAbove the federal limit27.00 mg/LMay 202640 servedRebel Ridge VillageHuman impact likely1.13 mg/LMay 202660 servedReche Canyon Mutual Water Co.Health-study range9.30 mg/LMar 2026150 servedCity of Red BluffHuman impact likely1.80 mg/LMay 202614,710 servedCity of ReddingHuman impact likely1.88 mg/LMay 202689,628 servedRedlands City Mud-Water DivHuman impact likely2.70 mg/LJun 202678,025 servedCity of Redwood Citypurchased waterAbove the federal limit11.40 mg/LJul 202592,819 servedRedwood Heights Mutual Water CompanyNatural background0.20 mg/LJul 202530 servedRedwood Terrace MutualNatural background0.12 mg/LMar 202656 servedCity of ReedleyHealth-study range6.20 mg/LMay 202626,076 servedReeds Creek EstatesNatural background0.60 mg/LSep 202570 servedResort Improvement District #1Natural background0.05 mg/LJan 2026803 servedResthaven Mobile Home ParkNatural background0.05 mg/LApr 202699 servedCity of RialtoHuman impact clear3.10 mg/LMay 202654,453 servedRichardson Beardsley Park Inc.Natural background0.20 mg/LMar 202628 servedRichgrove Community Services DistrictNatural background0.05 mg/LMay 20261,617 servedRidge Mutual Water Companypurchased waterNatural background0.20 mg/LMar 2026213 servedRidgeview Estates MwcNatural background0.05 mg/LDec 202550 servedRidgewood Water SystemNatural background0.20 mg/LDec 2025265 servedRiebli Mutual Water CompanyNatural background0.20 mg/LMar 2026150 servedRim Rock Water CompanyNatural background0.20 mg/LAug 202555 servedRincon Del Diablo Mwd (Id-1)purchased waterNatural background0.46 mg/LMay 202630,757 servedRincon Del Diablo Mwd (Id-A)purchased waterNatural background0.20 mg/LMay 20263,275 servedRincon Valley Mobile EstatesNatural background0.20 mg/LMar 2026460 servedRincon Water & Road Workspurchased waterNatural background0.80 mg/LJun 202625 servedRio Alto Water DistrictNatural background0.90 mg/LOct 20253,329 servedRio Cosumnes Correctional Center [Sws]Natural background0.21 mg/LNov 20252,800 servedRio Lindo Adventist AcademyNatural background0.20 mg/LDec 2025178 servedRio Manor Mutual Water CoHuman impact likely2.20 mg/LMay 2026983 servedRio Ranch Community Svcs DistNatural background0.20 mg/LFeb 202644 servedCity of Rio VistaHuman impact clear3.00 mg/LNov 202510,489 servedRio Vista Mobile Home ParkHuman impact likely1.21 mg/LApr 2026543 servedCity of RiponHuman impact clear4.50 mg/LMay 202615,741 servedRiselen ParkHuman impact likely1.84 mg/LJun 2025100 servedRite of Passage/Sierra RidgeNatural background0.20 mg/LMar 2025150 servedRiver Estates Mutual Water CompanyNatural background0.67 mg/LDec 2025250 servedRiver Highlands CsdNatural background0.20 mg/LOct 2025200 servedRiver Pines PudHuman impact likely1.80 mg/LJun 2025574 servedRiver Ranch Farm Worker CenterNatural background0.20 mg/LFeb 202666 servedRiver Ranch MhpNatural background0.20 mg/LJul 2025176 servedRiver Ranch Mobile Home ParkHealth-study range5.64 mg/LApr 2026305 servedRiver Rd Ws #25Above the federal limit38.00 mg/LFeb 202665 servedRiver Road Mutual Water CompanyHealth-study range8.20 mg/LDec 202426 servedRiver View Mhc LlcHuman impact likely1.50 mg/LApr 2026100 servedRiver'S Edge Marina & ResortNatural background0.20 mg/LOct 2025210 servedCity of RiverbankHealth-study range6.40 mg/LDec 202524,834 servedRiverbend Mobile Home ParkNatural background0.05 mg/LSep 202560 servedRiverdale EstatesHuman impact clear3.40 mg/LJan 2026300 servedRiverdale Park Tract CsdHealth-study range9.00 mg/LFeb 2026610 servedRiverdale Public Utility DistrictNatural background0.12 mg/LApr 20262,756 servedRiverfront Mutual Water CompanyNatural background0.20 mg/LFeb 202625 servedRiverkern Mutual Water CompanyHuman impact likely2.10 mg/LAug 2025272 servedRiverland ResortNatural background0.12 mg/LMay 2026400 servedRivernook CampgroundHuman impact likely2.70 mg/LAug 2025877 servedRivers End Trailer ParkNatural background0.20 mg/LJan 202635 servedCity of RiversideHealth-study range5.90 mg/LMay 2026298,398 servedRiverside Crossing MhpHuman impact likely1.70 mg/LMay 2025104 servedRiverside Csa #122-Mesa VerdeHuman impact likely1.10 mg/LMar 2026766 servedRiverside Highland Water CompanyHuman impact clear4.30 mg/LApr 202620,188 servedRiverside Mobile Home ParkNatural background0.20 mg/LJun 202555 servedRiverstone/Rootcreek Water DistrictHealth-study range6.20 mg/LApr 20265,507 servedRiverview Homeowners AssociationNatural background0.05 mg/LAug 202540 servedRiverview Mobile Home EstatesAbove the federal limit12.20 mg/LMay 2026540 servedRiverview Mobile Home ParkHealth-study range5.10 mg/LApr 2026126 servedRiverview Water AssociationNatural background0.20 mg/LSep 2025230 servedRobin Way Water SystemHealth-study range9.60 mg/LMay 202666 servedRobinson'S Corner MhpHuman impact likely1.72 mg/LMar 202620 servedRobley Property MwsHuman impact likely1.50 mg/LSep 202592 servedRockwood Estates Mutual Water CompanyNatural background0.12 mg/LJul 202530 servedRocky Comfort Mutual Water Copurchased waterHuman impact likely2.70 mg/LJun 202671 servedRogina Water Company Inc.Natural background0.20 mg/LNov 20232,554 servedCity of Rohnert ParkNatural background0.20 mg/LMar 202643,821 servedRolling Acres Mutual Water CompanyHuman impact likely1.80 mg/LMay 202640 servedRolling Green Utilities, Inc.Natural background0.89 mg/LDec 20251,225 servedRolling Hills Rancho WaAbove the federal limit10.90 mg/LMay 2026185 servedRolling Oaks Road AssociationNatural background0.20 mg/LDec 202525 servedRosa Morada Mutual Water CompanyNatural background0.12 mg/LJul 2025138 servedRosamond CsdHuman impact likely1.50 mg/LJul 202517,711 servedRosario ParkNatural background0.20 mg/LJul 202538 servedRosecrest MutualHuman impact clear3.58 mg/LApr 202631 servedRoseland Mobile Home ParkHealth-study range6.40 mg/LMar 2026130 servedRoseview Heights Mutual Water Companypurchased waterNatural background0.20 mg/LMar 2026148 servedCity of RosevilleNatural background0.03 mg/LNov 2025155,612 servedRough & Ready VillageNatural background0.20 mg/LApr 2025268 servedRound Mountain Water CompanyHuman impact likely1.70 mg/LOct 202550 servedRountree Facility(Prev. Sheriff'S Rehab)Natural background0.30 mg/LMar 2026235 servedRowland Water Districtpurchased waterNatural background0.63 mg/LMay 202656,100 servedRoyal Carrizo HoaNatural background0.71 mg/LJan 202625 servedRoyal Oak Place WsHuman impact clear3.30 mg/LApr 202660 servedRoyal Sierra Estates WsNatural background0.05 mg/LMay 202636 servedRubidoux Community SdHuman impact clear4.70 mg/LJun 202636,827 servedRubio Canon Land & Water AssociationHealth-study range6.20 mg/LApr 20269,215 servedRubys Valley Care HomeHuman impact likely1.40 mg/LApr 202679 servedRucker Avenue Mutual Water CoHealth-study range7.00 mg/LMar 202625 servedRunning Springs Water DistrictNatural background0.20 mg/LJun 20265,268 servedRural North Vacaville Water DistrictNatural background0.91 mg/LApr 20261,313 servedRussian River County Water DistrictNatural background0.20 mg/LDec 20254,150 servedRussian River Mutual Water Co.Human impact clear3.30 mg/LFeb 202687 servedRussos Mobile ParkNatural background0.20 mg/LAug 2025110 served
S
S & T Mutual Water CompanyHealth-study range7.70 mg/LMay 2026591 servedSa 14 Chuk Chanse SubdivisionNatural background0.84 mg/LOct 2024100 servedSac City Mobile Home Community LpHealth-study range7.40 mg/LApr 2026350 servedCity of Sacramento MainNatural background0.20 mg/LAug 2025527,979 servedSacramento Suburban Water DistrictHuman impact likely1.10 mg/LJan 2026194,444 servedSaddleback Mutual Water Co.Natural background0.90 mg/LJul 202590 servedSahara Mobile CourtHuman impact clear4.10 mg/LApr 2026300 servedSaint Marie Mobile Home ParkHuman impact clear4.20 mg/LOct 2025320 servedSalinas Valley State PrisonHuman impact clear4.90 mg/LMay 20262,930 servedSan Andreas Mutual Water CoHealth-study range8.00 mg/LMay 2026378 servedSan Antonio Canyon MscNatural background0.20 mg/LDec 2025119 servedSan Antonio Water CompanyAbove the federal limit13.00 mg/LApr 20263,441 servedSan Ardo WdNatural background0.20 mg/LApr 2026575 servedSan Augustin Mutual Water CompanyNatural background0.20 mg/LJul 202543 servedSan Benito County Water DistrictNatural background0.95 mg/LSep 202325 servedSan Bernardino CityHuman impact clear4.70 mg/LMay 2026214,665 servedSan Bernardino Valley WdHuman impact clear3.00 mg/LJun 2026109,608 servedCity of San BrunoHuman impact likely1.60 mg/LJan 202642,631 servedSan Cayetano Mutual Water CoHuman impact likely2.20 mg/LJan 202643 servedCity of San ClementeNatural background0.45 mg/LJan 202651,545 servedCity of San DiegoNatural background0.20 mg/LMay 20261,385,379 servedSan Diego County Water AuthorityNatural background0.46 mg/LMay 20260 servedSan Dieguito Wdpurchased waterNatural background0.13 mg/LMar 202640,405 servedSan Fernando-City, Water Dept.Human impact clear3.50 mg/LJun 202623,946 servedSan Francisco Regional Water SystemNatural background0.42 mg/LJun 2025600 servedSan Gabriel County WdHuman impact likely1.30 mg/LMay 202639,345 servedSan Gabriel Valley Water Co-Montebello 1purchased waterHealth-study range6.50 mg/LApr 20269,630 servedSan Gabriel Valley Water Co-Montebello 2purchased waterHealth-study range6.50 mg/LApr 20267,330 servedSan Gabriel Valley Water Co.-El MonteHealth-study range6.50 mg/LApr 2026248,000 servedSan Gabriel Valley Wc - FontanaHealth-study range5.60 mg/LApr 2026237,700 servedCity of San JacintoNatural background0.69 mg/LSep 202518,950 servedSan Jerardo Coop WsHealth-study range8.40 mg/LApr 2026249 servedSan Joaquin County - Colonial Heightspurchased waterNatural background0.20 mg/LJun 20251,841 servedSan Joaquin County - Lincoln Villagepurchased waterNatural background0.20 mg/LJun 20255,841 servedSan Joaquin County - ThorntonNatural background0.20 mg/LJan 2026964 servedSan Joaquin County - Wilkinson ManorHuman impact likely2.10 mg/LDec 2025851 servedSan Joaquin County-Mokelumne AcresHuman impact likely1.70 mg/LDec 20253,802 servedSan Joaquin County-Raymus VillageHealth-study range9.70 mg/LMay 20261,086 servedSan Joaquin Estates Mutual Water CompanyAbove the federal limit19.00 mg/LApr 2026165 servedSan Joaquin River Club IncHealth-study range6.60 mg/LApr 2026600 servedSan Joaquin Water Works #2Natural background0.70 mg/LFeb 2026310 servedCity of San Jose - Evg/Edv/CoyHuman impact clear3.40 mg/LMar 2026101,265 servedCity of San Jose - Nsj/AlvisoHuman impact clear3.10 mg/LFeb 202645,559 servedSan Jose WaterNatural background0.20 mg/LMar 20261,039,920 servedSan Juan Rd Ws #01Human impact likely1.80 mg/LJan 202649 servedSan Juan VistaHuman impact clear3.40 mg/LMar 2026201 servedSan Juan Water DistrictNatural background0.20 mg/LOct 202529,598 servedSan Lorenzo Valley Water DistNatural background0.03 mg/LMay 202521,145 servedSan Lucas County Water DistrictHuman impact likely1.40 mg/LMay 2026315 servedSan Luis Obispo Water DepartmentNatural background0.20 mg/LSep 202547,788 servedSan Marcos Mutual Water CompanyHuman impact clear3.40 mg/LFeb 2025120 servedSan Martin County Water DistrictHuman impact clear4.60 mg/LJul 2025627 servedSan Martin Foothills Water CompanyHealth-study range7.30 mg/LOct 2025145 servedSan Miguel Community Services DistrictHuman impact clear3.90 mg/LApr 20262,600 servedSan Miguel Ws #01Human impact likely1.40 mg/LApr 2026100 servedSan Miguel Ws #03purchased waterHuman impact clear3.30 mg/LApr 202645 servedSan Miguel Ws #22Human impact likely2.50 mg/LJan 202693 servedSan Miguelito MwcNatural background0.20 mg/LApr 20261,600 servedSan Pasqual AcademyHuman impact likely2.20 mg/LApr 2026298 servedSan Simeon CsdHuman impact likely1.30 mg/LApr 2026462 servedSan Vicente MwcHealth-study range6.30 mg/LMay 202669 servedSan Vicente Water CompanyHuman impact clear3.60 mg/LAug 2025550 servedSandmound MutualNatural background0.20 mg/LJun 2025100 servedSandy Creek Village MhpHealth-study range8.50 mg/LMay 202689 servedSandy Point Mobile Home ParkNatural background0.20 mg/LJul 202567 servedCity of SangerAbove the federal limit12.00 mg/LJun 202626,357 servedCity of Santa AnaHuman impact likely1.33 mg/LJan 2026310,539 servedSanta Ana River Water CompanyHealth-study range7.30 mg/LMay 20265,848 servedSanta Anita Mutual Water CompanyNatural background0.20 mg/LJul 202538 servedCity of Santa Barbara Water DepartmentNatural background0.05 mg/LApr 202699,323 servedCity of Santa ClaraHuman impact clear4.70 mg/LDec 2025130,746 servedSanta Clara Valley Water DistrictNatural background0.50 mg/LMay 20260 servedSanta Clarita Valley Water AgencyHuman impact clear3.60 mg/LMay 2026294,090 servedSanta Cruz Water DepartmentNatural background0.20 mg/LApr 202694,626 servedSanta Fe I.D.Natural background0.13 mg/LMar 202621,578 servedSanta Fe Springs - City, Water Dept.purchased waterNatural background0.68 mg/LApr 202619,219 servedSanta Lucia Preserve WsNatural background0.05 mg/LJul 2024966 servedSanta Margarita Water Districtpurchased waterNatural background0.20 mg/LMay 2026168,289 servedSanta Margarita Water District-Id9purchased waterNatural background0.05 mg/LMay 202639,684 servedCity of Santa Maria Utilities DepartmentHuman impact clear4.00 mg/LJun 2026109,477 servedSanta Monica-City, Water DivisionHuman impact clear3.90 mg/LMay 202689,947 servedSanta Nella County Water DistrictNatural background0.70 mg/LOct 20252,211 servedCity of Santa PaulaHuman impact likely2.70 mg/LAug 202531,018 servedSanta Rita WaterNatural background0.20 mg/LSep 202559 servedCity of Santa RosaNatural background0.11 mg/LDec 2025175,396 servedSanta Rosa Mobile EstatesHealth-study range5.30 mg/LMay 2026420 servedSanta Teresa Meadows Water CompanyHuman impact clear4.30 mg/LJun 202568 servedSanta Ynez Rancho EstatesHuman impact likely2.00 mg/LFeb 2026304 servedSanta Ynez River Water Cons. Dist. Id#1Health-study range5.90 mg/LApr 20267,022 servedSanta Ynez Roblar Mobile Home ParkHuman impact likely2.70 mg/LJul 202425 servedSanta Ysabel Ranch MwcHuman impact likely1.80 mg/LApr 2026344 servedSantos Ranch Pws #5-Csa #35Human impact likely1.30 mg/LFeb 2026320 servedSaratoga Heights Mutual Water Companypurchased waterNatural background0.20 mg/LMar 2026258 servedSaticoy Country Club-City of VenturaHealth-study range8.70 mg/LMay 2026196 servedSaviers Road Mutual Water Copurchased waterHuman impact likely1.50 mg/LJun 2026368 servedSbdno County Service Area 64Natural background0.85 mg/LMar 202614,911 servedSbdno County Service Area 70 Cedar GlenNatural background0.57 mg/LJan 20261,240 servedSbdno County Service Area 70JHuman impact likely2.60 mg/LJan 202612,843 servedSce Bishop Creek Plant 4Natural background0.12 mg/LAug 202538 servedSchweikart Water SystemNatural background0.57 mg/LAug 202527 servedScotts Valley Water DistrictNatural background0.05 mg/LSep 202511,197 servedScwa - Laguna/VineyardNatural background0.12 mg/LMay 2026184,896 servedScwa Mather-SunriseNatural background0.12 mg/LFeb 202630,825 servedSea Ranch Water Company,The (Puc)Natural background0.20 mg/LMar 20261,160 servedSeafair Road And Water CompanyNatural background0.87 mg/LApr 202650 servedCity of Seal BeachNatural background0.05 mg/LFeb 202624,937 servedSearles Valley Minerals Operations IncHuman impact likely2.40 mg/LAug 20251,818 servedCity of SebastopolHuman impact likely1.90 mg/LFeb 20267,522 servedSeeley CwdHuman impact likely2.70 mg/LApr 20261,729 servedSegura'S Rv Park LlcHuman impact likely1.50 mg/LApr 202527 servedSequoia Water AssocNatural background0.20 mg/LMar 202654 servedSereno Del Mar Water Company (Puc)Natural background0.20 mg/LDec 2025435 servedSerrano Water DistrictNatural background0.85 mg/LJan 20265,659 servedSfpuc City Distribution DivisionAbove the federal limit11.40 mg/LJul 2025848,019 servedSfpuc-Pleasanton WellsHuman impact likely2.50 mg/LJun 20251 servedShaded Terrace PwsNatural background0.20 mg/LJan 2026238 servedShadow Acres Mutual Water CompanyHealth-study range5.20 mg/LSep 2025450 servedShadow Mountain MhpHuman impact likely1.20 mg/LApr 2025126 servedShady Grove Mobile Home Park, LlcHuman impact likely1.20 mg/LNov 202595 servedShady Lake Water AssociationHuman impact likely2.60 mg/LNov 202590 servedShady Oaks Mobile Home Park LlcHuman impact clear4.50 mg/LMar 202523 servedShady Rest Trailer CourtHealth-study range5.30 mg/LMar 2026150 servedCity of ShafterHuman impact likely2.40 mg/LMay 202621,915 servedShamrock Mobile Home ParkNatural background0.20 mg/LJan 2026188 servedSharondale Mesa HoaHealth-study range6.60 mg/LJan 2026340 servedShasta Cascade Mobilehome ParkHuman impact clear3.40 mg/LApr 2026100 servedShasta Co Csa # 13 Alpine MeadowsNatural background0.05 mg/LDec 2025141 servedShasta Forest Village M.W.C.Natural background0.41 mg/LJan 2026750 servedShasta Horizon Mobile Home ParkNatural background0.20 mg/LNov 202455 servedShasta View Heights Owners AssociationNatural background0.05 mg/LNov 202548 servedShastina Mobile EstatesHuman impact likely2.80 mg/LMay 202532 servedShaver Lake Heights MwcNatural background0.12 mg/LFeb 2026836 servedShaver Lake Heights Water AssnNatural background0.12 mg/LFeb 2026345 servedSheep Creek Water CompanyNatural background0.63 mg/LFeb 20264,002 servedSherwood Mobile Home ParkHuman impact likely1.00 mg/LOct 2025540 servedShorelands Road & Water CompanyHuman impact likely1.80 mg/LJan 202578 servedSid - Blue Ridge Oakspurchased waterNatural background0.03 mg/LApr 202663 servedSid - ElmiraHuman impact likely2.30 mg/LApr 2026290 servedSid - Gibson CanyonNatural background0.12 mg/LMar 2026535 servedSid - Peabodypurchased waterNatural background0.03 mg/LApr 202656 servedSid - Pleasant Hills RanchNatural background0.12 mg/LMar 202689 servedSid - Quail CanyonNatural background0.27 mg/LNov 2025132 servedSierra Bella Mutual Water CompanyNatural background0.42 mg/LFeb 2026144 servedSierra Breeze Mutual Water CompanyHealth-study range5.10 mg/LApr 2026150 servedSierra Cedars CsdNatural background0.12 mg/LFeb 2026850 servedSierra City Water Works, Inc.Natural background0.20 mg/LApr 2026250 servedSierra Co. W.W.D #1 CalpineHuman impact likely1.20 mg/LJun 2025182 servedSierra Csa #5, Sierra BrooksNatural background0.20 mg/LMar 2026726 servedSierra East HoaNatural background0.34 mg/LMar 202684 servedSierra Estates Mutual Water CompanyNatural background0.20 mg/LMar 2026100 servedSierra Grande Estates Mutual Water Co.Natural background0.60 mg/LApr 2026138 servedSierra Highland CsdHuman impact likely1.70 mg/LNov 2025600 servedSierra Lakes County Water DistNatural background0.07 mg/LMar 2026824 servedSierra Linda Mutual Water CoNatural background0.20 mg/LDec 2025200 servedSierra Madre-City, Water Dept.Human impact likely1.30 mg/LMay 202611,000 servedSierra MeadowsHuman impact likely1.20 mg/LAug 202568 servedSierra Moon Mutual Water CompanyNatural background0.70 mg/LFeb 2026120 servedSierra Mutual Water CompanyHealth-study range8.00 mg/LMay 202643 servedSierra North Community Service DistrictHealth-study range7.70 mg/LMar 202642 servedSierra Park Water Company Inc.Natural background0.05 mg/LDec 2025400 servedSierra Pines Mobile Home ParkNatural background0.23 mg/LNov 202570 servedSierra Twain Harte MhpNatural background0.20 mg/LJul 2024129 servedSierra Village Mobile Home ParkNatural background0.20 mg/LDec 202522 servedSierra Village Mutual Water CoNatural background0.20 mg/LJan 2026361 servedSierra Vista AssociationAbove the federal limit15.00 mg/LApr 202643 servedSierra Water Resources - Sierra CityNatural background0.20 mg/LMay 2026324 servedSierraville P.U.D.Natural background0.07 mg/LAug 2025200 servedSiesta Mobile Home ParkNatural background0.20 mg/LJan 2026160 servedSiete Robles Mutual Water CoHuman impact clear3.60 mg/LApr 2026323 servedSignal Hill - City, Water Dept.Natural background0.42 mg/LDec 202511,848 servedSisar Mutual Water CoHealth-study range5.70 mg/LMar 2026340 servedSiskiyou Co. Rolling Hills MwcHuman impact likely1.87 mg/LFeb 2026300 servedSisquocHuman impact likely1.40 mg/LJan 2026135 servedSix Acres Water CompanyHuman impact likely1.00 mg/LMar 202666 servedSkp Park of The Sierras IncNatural background0.12 mg/LJan 2026450 servedSky Acres Mutual Water CorpHuman impact likely1.80 mg/LMar 2026175 servedSky Forest MwcHealth-study range6.10 mg/LDec 2025492 servedSky View County WaterNatural background0.20 mg/LApr 2026412 servedSkyline ParkHealth-study range6.90 mg/LJun 2026295 servedSleepy Valley Water CompanyHuman impact clear4.40 mg/LJun 2026160 servedSlide Inn Snowbowl Water CoNatural background0.20 mg/LJul 2025417 servedSlo Csa No. 10 - Cayucos WtpNatural background0.20 mg/LMay 20260 servedSlo Csa No. 16 - ShandonHuman impact clear4.60 mg/LMay 20261,085 servedSlo Cwwd No. 23 - Santa MargaritaNatural background0.59 mg/LMay 20261,291 servedSlocsa #10A - Cayucospurchased waterNatural background0.20 mg/LMay 20261,200 servedSlvwd - Felton Water SystemNatural background0.03 mg/LMay 20254,340 servedSmiley Park Country ClubNatural background0.20 mg/LNov 2025370 servedSmith River C.S.D.Natural background0.34 mg/LMar 20262,568 servedSmwd - Sj Ground Water PlantNatural background0.05 mg/LMay 20260 servedSnowcrest Heights Imp AssocNatural background0.20 mg/LJan 2026600 servedSnowshoe Springs Assn.Natural background0.20 mg/LDec 2025686 servedSnug Harbor Rv LpNatural background0.20 mg/LOct 2025125 servedSo. Cal. Edison Co.-Santa CatalinaNatural background0.20 mg/LMar 20263,822 servedSobre Vista Water CompanyNatural background0.20 mg/LJun 202580 servedSolano Verde Mutual Water Copurchased waterNatural background0.20 mg/LJan 2026100 servedSolvang Water DivisionNatural background0.90 mg/LApr 20266,126 servedSon Shine PropertiesAbove the federal limit25.00 mg/LApr 2026438 servedCity of SonomaHuman impact likely1.90 mg/LDec 202511,725 servedSonoma County Csa 41-Fitch Mountainpurchased waterNatural background0.20 mg/LMar 20261,265 servedSonoma County Csa 41-FreestoneNatural background0.20 mg/LDec 2025290 servedSonoma County Csa 41-Salmon CreekHuman impact likely2.50 mg/LSep 2025427 servedSonoma County Mutual Water CompanyNatural background0.20 mg/LMar 202640 servedSonoma County Water AgencyNatural background0.20 mg/LSep 20250 servedSonoma Mountain County Water DistrictNatural background0.20 mg/LMar 2026181 servedSonoma Ranch Mutual Water CompanyNatural background0.20 mg/LJan 2026151 servedSonoma State UniversityHuman impact likely2.60 mg/LSep 202310,986 servedSonora Estates Mobile Home ParkHuman impact likely2.30 mg/LOct 2025235 servedSonora Meadows Mutual Wtr CoNatural background0.66 mg/LDec 20251,123 servedSonora Water Resources, Incpurchased waterNatural background0.12 mg/LAug 20251,154 servedSoquel Creek Water DistrictHealth-study range5.60 mg/LFeb 202640,809 servedSouth Cloverdale Water CompanyNatural background0.20 mg/LJun 202590 servedSouth Coast Water DistrictNatural background0.92 mg/LFeb 202641,118 servedSouth County Retirement HomeHuman impact clear4.40 mg/LJul 202546 servedSouth Desert Mutual Water CompanyNatural background0.92 mg/LJul 202528 servedSouth Feather W&P - BangorNatural background0.12 mg/LMay 202673 servedSouth Feather W&P - Miners RanchNatural background0.12 mg/LMay 202622,664 servedSouth Fork Estates Mutual Water CoHealth-study range5.00 mg/LFeb 2026106 servedSouth Gate-City, Water Dept.Human impact likely2.40 mg/LApr 202676,443 servedSouth Kaweah Mutual Water CompanyHuman impact clear4.00 mg/LMay 2025384 servedSouth Kern Mutual Water CompanyHealth-study range5.10 mg/LApr 202632 servedSouth Mesa WcHealth-study range8.30 mg/LJun 202610,108 servedSouth Midway City Mutual Water Co.Human impact likely1.12 mg/LMay 2026891 servedSouth Montebello Irrigation Dist.Natural background0.20 mg/LSep 202515,021 servedSouth Mountain Mutual Water CoHuman impact clear3.10 mg/LSep 202558 servedCity of South PasadenaHuman impact clear4.80 mg/LMay 202625,329 servedSouth San Joaquin Irrigation DistrictNatural background0.20 mg/LMay 202525 servedSouth Tahoe Pud - MainNatural background0.05 mg/LJul 2025100,000 servedSouthwest Tract W M D [Sws]purchased waterNatural background0.01 mg/LAug 2023103 servedSpanish Lakes Mutual Water CoHuman impact likely1.00 mg/LJan 2026125 servedSpindrift MarinaNatural background0.12 mg/LMar 2026100 servedSportsmans ParadiseNatural background0.20 mg/LJul 2025138 servedSpring Canyon WaAbove the federal limit12.20 mg/LJun 202690 servedSpring Creek Estates PwsHuman impact likely1.20 mg/LMar 2026119 servedSpring Valley Heights Association Incpurchased waterNatural background0.50 mg/LMay 202666 servedSpringwood Estates MwcNatural background0.12 mg/LAug 202550 servedSpv Water CompanyHealth-study range7.50 mg/LApr 2026211 servedSt Francis Tract Water SystemNatural background0.10 mg/LJan 2025118 servedSt. Clair Ranchos Mutual Water Co.Human impact likely1.00 mg/LAug 2025105 servedCity of St. HelenaNatural background0.20 mg/LFeb 20255,386 servedStallion Springs CsdHuman impact likely1.60 mg/LMay 20264,910 servedStanford UniversityHuman impact clear3.20 mg/LMay 202635,853 servedStanislaus Regional Water AuthorityNatural background0.49 mg/LJan 20240 servedStarlite Community Service DistrictHuman impact likely2.80 mg/LDec 2025241 servedSterling Mutual Water CompanyHuman impact clear4.00 mg/LApr 2026198 servedStinson Beach County Wtr DistNatural background0.20 mg/LAug 2025583 servedStockdale Annex Mutual WaterNatural background0.81 mg/LAug 2025433 servedStockdale Ranchos Mutual Water CoHuman impact likely1.60 mg/LAug 2025393 servedCity of StocktonNatural background0.20 mg/LAug 2025191,302 servedStockton East Water DistrictNatural background0.20 mg/LJun 202550 servedStockton Verde Mobile Home ParkHuman impact clear4.42 mg/LApr 2026711 servedStone Creek Water CompanyNatural background0.20 mg/LJul 2025152 servedStonebridge Mutual Water CoNatural background0.90 mg/LDec 202538 servedStonegate Mobile Home ParkHuman impact likely2.10 mg/LJun 2025196 servedStonewood Canyon EstatesNatural background0.20 mg/LJun 202540 servedStrathmore Public Util DistHuman impact clear4.30 mg/LMay 20262,669 servedStrawberry Lodge MwcHuman impact clear4.10 mg/LApr 2026381 servedStrawberry Rd Ws #06Human impact clear4.00 mg/LMar 202678 servedStrickland Mutual Water CompanyHuman impact likely2.20 mg/LFeb 2026429 servedStruve Rd Ws #02Health-study range5.70 mg/LApr 2026166 servedSuburban Water Systems - SativaHuman impact likely1.10 mg/LOct 20254,363 servedSuburban Water Systems-Covina Knollspurchased waterHealth-study range7.00 mg/LJun 20261,437 servedSuburban Water Systems-Glendorapurchased waterHealth-study range7.00 mg/LJun 20265,249 servedSuburban Water Systems-La MiradaNatural background0.20 mg/LSep 202556,793 servedSuburban Water Systems-San JoseHealth-study range7.50 mg/LMay 2026168,843 servedSuburban Water Systems-WhittierHuman impact likely2.60 mg/LJan 202666,045 servedSugar Pine Homeowners AssocNatural background0.20 mg/LMar 2026120 servedSugar Pine Rv ResortHuman impact likely1.50 mg/LJan 2026219 servedSuisun-Solano Water AuthorityNatural background0.12 mg/LMar 202629,105 servedSullivan Mutual WaterHealth-study range5.10 mg/LDec 202553 servedSultana Community Services DistrictHuman impact clear4.50 mg/LFeb 2024983 servedSummerhill Mhp WsNatural background0.80 mg/LMay 202695 servedSummit View Ranch Mutual Water Co.Natural background0.20 mg/LMay 202545 servedSummit West Mutual Water Co.purchased waterNatural background0.20 mg/LMar 2026481 servedSun Mountain M.W.C.Human impact likely2.66 mg/LMar 2026106 servedSunbeam Lake Rv Resortpurchased waterHuman impact likely2.70 mg/LApr 2026650 servedSundale Mutual Water Company A, BHuman impact clear4.10 mg/LMay 20241,050 servedSunland Village Mobile Home ParkNatural background0.56 mg/LDec 202573 servedSunny Acres MwsHuman impact likely2.50 mg/LApr 202645 servedSunny Road Water SystemNatural background0.20 mg/LJan 202634 servedSunny Slope Water Co.Human impact clear3.30 mg/LMay 202625,252 servedSunnyside Convalescent HospHuman impact clear3.80 mg/LMar 2025275 servedSunnyside Estates Water Systempurchased waterHealth-study range5.70 mg/LMay 202669 servedSunnyside Farms Mutual Water CompanyHealth-study range7.50 mg/LMay 2026436 servedCity of SunnyvaleHealth-study range6.22 mg/LMar 2026157,566 servedTown of Sunol - Sfpucpurchased waterNatural background0.42 mg/LJun 2025281 servedSunrise Estates Mutual Water CompanyNatural background0.60 mg/LNov 2025150 servedSunrise Mountain Mutual Water CompanyNatural background0.20 mg/LMar 2026100 servedSunrise Mutual Water Co.Human impact likely1.70 mg/LMar 2026109 servedSunrise Shore Mutual Water CompanyNatural background0.20 mg/LDec 202483 servedSunrise Village MhpHuman impact likely1.06 mg/LOct 2025353 servedSunset Beach Mutual Water Copurchased waterHuman impact clear3.10 mg/LMay 2026182 servedSunset Park CommunityHuman impact likely2.70 mg/LApr 2025141 servedSunset Vista Estates MhpNatural background0.12 mg/LJan 2026400 servedSunset West Community LlcHealth-study range5.00 mg/LApr 2026350 servedSurrey Village Water Co. Inc.Natural background0.20 mg/LApr 2026163 servedSusan Hills Estates WcHuman impact likely1.10 mg/LSep 2025252 servedSusan River Park Water Co.Natural background0.20 mg/LAug 2025140 servedCity of SusanvilleHuman impact likely1.70 mg/LOct 20257,811 servedSutter Community S.D.Human impact likely2.90 mg/LFeb 20262,904 servedSweet Water Co-OpNatural background0.05 mg/LAug 202547 servedSweetwater AuthorityNatural background0.12 mg/LSep 2025191,282 servedSweetwater Springs Cwd - GuernevilleNatural background0.20 mg/LMar 20266,000 servedSweetwater Springs Cwd - Monte RioNatural background0.20 mg/LApr 20253,000 served
T
Tahama Village Mobile Home ParkHealth-study range5.90 mg/LApr 2026200 servedTahoe City Pud - Alpine PeaksNatural background0.07 mg/LDec 2025201 servedTahoe City Pud - Madden CreekNatural background0.07 mg/LApr 2025300 servedTahoe City Pud - MainNatural background0.22 mg/LDec 20255,661 servedTahoe City Pud - RubiconNatural background0.07 mg/LJun 2024703 servedTahoe City Pud - Tahoe CedarsNatural background0.07 mg/LApr 2025793 servedTahoe City Pud - Tahoe Swiss VillageNatural background0.07 mg/LDec 20253,363 servedTahoe City Pud - TimberlandNatural background0.07 mg/LFeb 2026200 servedTahoe Keys Water CompanyHuman impact likely1.00 mg/LJan 20241,420 servedTahoe Park Water Co - Skyland/NielsenNatural background0.20 mg/LJun 202550 servedTahoe Park Water CompanyNatural background0.20 mg/LNov 2024750 servedTalmont Resort Improvement DistrictNatural background0.20 mg/LJun 2025300 servedTassajara Springs WsNatural background0.05 mg/LJun 2025150 servedTeen ChallengeHuman impact clear3.50 mg/LJan 2026130 servedCity of TehachapiHealth-study range5.80 mg/LJun 20269,094 servedCity of TehamaHuman impact likely1.40 mg/LMay 2026483 servedTejon Castac Wd - I5 & Laval RdHuman impact likely2.36 mg/LJul 202538,125 servedTejon Ranch Main HeadquartersHuman impact likely1.90 mg/LApr 2026132 servedTemescal Valley Water Districtpurchased waterNatural background0.20 mg/LMay 202621,971 servedTempleton CsdNatural background0.40 mg/LApr 20268,011 servedTennant C.S.D.Natural background0.37 mg/LApr 202675 servedTerra Bella Irrigation District - TbtNatural background0.49 mg/LMay 20262,656 servedTerra De Oro Water CompanyNatural background0.12 mg/LMay 202638 servedTerra Nova Mobile Home ParkHuman impact likely2.10 mg/LOct 2025140 servedTerrace View Water SystemNatural background0.46 mg/LSep 202560 servedTesoro Viejo Master Mwc, Inc.Natural background0.12 mg/LJun 20253,885 servedTeviston Community Services DistrictHuman impact clear4.12 mg/LApr 2025383 servedThe Anne Sippi Clinic-Riverside RanchNatural background0.05 mg/LAug 202551 servedThe Painted Turtle CampNatural background0.50 mg/LMay 202557 servedThe River CommunityNatural background0.62 mg/LMay 202635 servedThe VillageNatural background0.66 mg/LApr 202640 servedThe Village Mobile Home ParkNatural background0.20 mg/LMay 202571 servedThe Willows ResortNatural background0.05 mg/LDec 202557 servedThermal ParkNatural background0.20 mg/LJan 202573 servedThermalito Water & Sewer DistNatural background0.20 mg/LApr 202612,136 servedThimio MwcAbove the federal limit11.30 mg/LApr 202659 servedThomas Mountain Water CompanyHuman impact likely2.20 mg/LApr 2026157 servedThomas Shaft Wholesalepurchased waterNatural background0.42 mg/LJun 20251 servedCity of Thousand Oaks Water Departmentpurchased waterNatural background0.20 mg/LJan 202653,157 servedThousand Trails - Morgan HillNatural background0.60 mg/LMay 2026413 servedThree Springs Ranch Mutual Water CompanyHealth-study range7.50 mg/LSep 2025110 servedThree Valleys MwdNatural background0.63 mg/LMay 20260 servedThunderbird CwdHealth-study range8.10 mg/LMay 20262,098 servedTico Mutual Water CoHealth-study range5.10 mg/LJun 202672 servedTierra Bonita Mutual WaterHuman impact likely2.40 mg/LApr 202675 servedTierra Buena Mhp #1Above the federal limit10.40 mg/LApr 202650 servedTierra Meadows Hoa WsNatural background0.90 mg/LMay 202658 servedTierra Verde MwcHuman impact likely2.90 mg/LSep 202548 servedTierra Vista MwcNatural background0.40 mg/LFeb 202554 servedTokay Park Water CoHuman impact likely1.10 mg/LFeb 2026653 servedTorrance-City, Water Dept.Natural background0.20 mg/LMar 2026106,183 servedTown & Country Water CompanyAbove the federal limit15.00 mg/LAug 202573 servedTrabuco Canyon Water DistrictNatural background0.29 mg/LApr 202613,659 servedTract 1199 Water SystemHuman impact likely1.70 mg/LApr 202525 servedTract 180 Mutual Water Co.Human impact likely1.30 mg/LJan 202614,000 servedTract 349 Mutual Water Co.Natural background0.56 mg/LAug 20258,700 servedCity of TracyNatural background0.33 mg/LJun 202596,609 servedTradewind Water Assoc.Human impact likely1.90 mg/LAug 2025632 servedTrailer Haven Mobile Home ParkHuman impact likely2.90 mg/LDec 2025459 servedTrails End Mutual Water CompanyNatural background0.51 mg/LOct 202552 servedTravis Afb Wtp - VallejoNatural background0.20 mg/LApr 20263 servedTreasure Creek Woods MwcNatural background0.05 mg/LSep 2025131 servedTreasure Islandpurchased waterAbove the federal limit11.40 mg/LJul 20253,864 servedTriple R Mutual Water CoHuman impact likely2.50 mg/LNov 2023408 servedTriunfo Water & Sanitation Districtpurchased waterNatural background0.20 mg/LJan 202613,898 servedTrout Gulch Mutual Water CompanyNatural background0.05 mg/LMar 2026614 servedTruckee-Donner Pud, MainNatural background0.55 mg/LJul 202536,730 servedTucker Acres Mutual Water Co.Natural background0.20 mg/LJan 2026200 servedTud - Columbia Water SystemNatural background0.12 mg/LAug 20255,463 servedTud - PonderosaNatural background0.12 mg/LAug 20251,767 servedTud - Sonora/Jamestown Water SystemNatural background0.12 mg/LAug 202511,054 servedTud - Tuolumne Water SystemNatural background0.12 mg/LAug 20251,761 servedTud - Upper Basin Water SystemNatural background0.12 mg/LOct 202513,280 servedTud-Apple Valley EstatesNatural background0.51 mg/LAug 2025826 servedTud-Peaceful Pines Water SystemNatural background0.12 mg/LAug 202592 servedTularcitos MwcNatural background0.05 mg/LSep 202590 servedCity of TulareHealth-study range6.20 mg/LMay 202672,241 servedTully Mobile EstatesHealth-study range6.30 mg/LJul 202456 servedTunnel Trailer ParkNatural background0.12 mg/LMay 202648 servedCity of TurlockHealth-study range6.27 mg/LNov 202572,682 servedCity of TustinHealth-study range6.50 mg/LMay 202666,600 servedTwain Harte Community Services DistrictNatural background0.20 mg/LJul 20252,378 servedTwentynine Palms Water DistrictHuman impact clear3.10 mg/LMar 202618,795 servedTwin Creeks Mobile And Rv VillageNatural background0.20 mg/LMar 202650 servedTwin Cypress Mobile Home ParkHuman impact likely2.80 mg/LFeb 2026112 servedTwin Lakes ResortHuman impact likely1.60 mg/LDec 2025400 servedTwin Oaks Mobile ParkHuman impact clear4.70 mg/LNov 2025238 servedTwin Valley IncHealth-study range9.80 mg/LJun 2026317 servedTwo Twenty Four Mobile Home PkNatural background0.79 mg/LDec 202535 served
U
U.S. Coast Guard Training Centerpurchased waterNatural background0.20 mg/LNov 2025469 servedU.S.N., San Nicolas IslandNatural background0.20 mg/LApr 2026254 servedUc - DavisNatural background0.47 mg/LFeb 202649,616 servedCity of UkiahNatural background0.48 mg/LJul 202516,607 servedUnion Heights MwcNatural background0.12 mg/LMay 202698 servedUnited Wtr Cons DistHuman impact likely1.50 mg/LJun 20260 servedCity of UplandHealth-study range5.20 mg/LJun 202678,376 servedUpper Lake County Water DistrictNatural background0.43 mg/LApr 2026989 servedUpper Little Bear Mountain ClubNatural background0.20 mg/LJul 2025101 servedUs Army Fort IrwinHuman impact likely1.40 mg/LApr 202615,701 servedUsmc - 29 PalmsNatural background0.20 mg/LApr 202615,248 servedUsmc - Housing ColevilleHuman impact likely1.60 mg/LFeb 2026424 servedUsmc Nebo (Barstow)purchased waterHuman impact clear3.50 mg/LJun 20261,126 servedUsmc/Mtn Warfare Trng Ctr - BridgeportNatural background0.34 mg/LMar 20261,200 servedUvas Pines Rv ParkNatural background0.27 mg/LJul 202565 served
V
V & P Trailer Court Water SystemHuman impact likely2.00 mg/LFeb 202635 servedVaca Villa ApartmentsNatural background0.20 mg/LJan 202660 servedCity of VacavilleNatural background0.05 mg/LApr 202699,650 servedVailima Estates Mutual WaterNatural background0.20 mg/LJan 202625 servedValencia Heights Water Co.Health-study range6.00 mg/LMay 20267,775 servedValenzuela Water SystemAbove the federal limit13.00 mg/LMay 202655 servedValhalla Water AssociationNatural background0.12 mg/LMay 202625 servedValivu Estates MhpNatural background0.05 mg/LJun 202554 servedVallecitos Wdpurchased waterNatural background0.46 mg/LMay 2026113,500 servedCity of VallejoNatural background0.20 mg/LApr 2026121,420 servedCity of Vallejo-Lakes SystemNatural background0.20 mg/LApr 20262,800 servedValley Center Mwdpurchased waterNatural background0.46 mg/LMay 202629,938 servedValley County Water Dist.Human impact likely2.40 mg/LMay 202668,871 servedValley Creek Mhp WsNatural background0.05 mg/LOct 2025129 servedValley Estates Poa, Inc.Human impact clear3.00 mg/LAug 2025386 servedValley Ford Water AssociationHealth-study range9.10 mg/LApr 202688 servedValley Oaks Mhp WsHuman impact clear4.40 mg/LDec 2025108 servedValley of Enchantment MwcHealth-study range5.00 mg/LNov 20252,471 servedValley of The Moon Water DistrictNatural background0.20 mg/LApr 202623,107 servedValley Springs PudHuman impact clear3.10 mg/LMar 2026900 servedValley State PrisonNatural background0.20 mg/LAug 20253,173 servedValley View Estates Mutual Water CoHuman impact likely1.60 mg/LOct 202597 servedValley View Mutual Water Co.Human impact likely1.10 mg/LNov 20254,613 servedValley View Park MwcHuman impact clear4.80 mg/LNov 2024499 servedValley View RanchesHuman impact likely1.60 mg/LMar 202645 servedValley View Trailer ParkNatural background0.20 mg/LMar 2026135 servedValley Vista Mutual Water CompanyHuman impact clear4.80 mg/LNov 202570 servedValley Water Co.Human impact clear3.20 mg/LJun 202610,070 servedVan Loon Water AssociationNatural background0.89 mg/LDec 202525 servedVandenberg Village Comm. Serv. Dist.Natural background0.20 mg/LNov 20247,308 servedVarian Ranch Mutual WaterHuman impact likely2.60 mg/LJul 2025105 servedVaughn Wc IncHuman impact clear3.80 mg/LJun 202637,189 servedVentana Big Sur Inn WsHuman impact clear4.20 mg/LMar 2026193 servedVentura Cwwd No. 1 - MoorparkNatural background0.20 mg/LAug 202535,514 servedVentura Cwwd No. 17 - Bell Canyonpurchased waterNatural background0.20 mg/LJan 20261,946 servedVentura Cwwd No. 19 - SomisNatural background0.20 mg/LAug 20251,429 servedVentura Cwwd No. 38 - Lake Sherwoodpurchased waterNatural background0.20 mg/LJan 20261,759 servedVentura River Water DistrictHuman impact likely1.70 mg/LJun 20266,100 servedVentura Water DepartmentHuman impact likely1.50 mg/LMay 2026113,500 servedVentura Wwd No. 8 - Simi ValleyNatural background0.79 mg/LNov 202594,738 servedVernon-City, Water Dept.Natural background0.20 mg/LMar 202628,112 servedVictorville Water DistrictHuman impact likely2.40 mg/LMar 2026135,983 servedVictory Mutual Water CompanyHuman impact clear3.40 mg/LMay 2026849 servedVieira'S Resort, IncNatural background0.12 mg/LFeb 2026200 servedVieja Mutual Water CompanyNatural background0.20 mg/LDec 202560 servedVierra Knolls MwcHuman impact likely1.30 mg/LFeb 202666 servedVierra Meadows MwcHuman impact clear3.50 mg/LMay 202665 servedViking Rv ParkHuman impact likely1.80 mg/LAug 202555 servedVilla Blue Estates Water DistrictNatural background0.20 mg/LMay 202660 servedVilla CerezosNatural background0.50 mg/LApr 2026200 servedVinehill Vistas Mutual Water CompanyNatural background0.20 mg/LJan 202642 servedVineyard Ave Estates MwcHuman impact likely1.90 mg/LOct 20251,200 servedVineyard Avenue Acres MwcHuman impact likely1.60 mg/LMay 20261,820 servedVineyard Rv ParkNatural background0.05 mg/LMay 2026550 servedVista Del Toro WsNatural background0.05 mg/LApr 202592 servedVista Grande Water SystemHealth-study range6.61 mg/LMay 2026468 servedVista Grande Water Users Associationpurchased waterNatural background0.20 mg/LMar 202679 servedVista Hills Mutual Water CompanyHuman impact likely1.60 mg/LApr 202575 servedVista Robles AssociationHuman impact likely1.20 mg/LNov 202553 servedVolcano Community Service DistHuman impact likely1.30 mg/LDec 2025103 servedVolta Community SdHuman impact likely2.70 mg/LSep 2025406 served
W
Walker Ranch CsdNatural background0.20 mg/LApr 2026150 servedWalking M RanchesNatural background0.20 mg/LSep 202454 servedWalnut AcresAbove the federal limit11.20 mg/LFeb 2026106 servedWalnut Cove Mobile EstatesHuman impact clear4.10 mg/LNov 2025200 servedWalnut Hills Mutual Water CoHuman impact clear3.40 mg/LJan 2026486 servedWalnut Park Mutual Water Co.Natural background0.70 mg/LJan 202616,180 servedWalnut Valley Water Districtpurchased waterNatural background0.63 mg/LMay 2026100,941 servedWard Well Water CompanyNatural background0.20 mg/LApr 2026425 servedWarner Springs EstatesHuman impact likely2.40 mg/LJan 2026448 servedWasco St. Prison Reception CtrHealth-study range7.00 mg/LMay 20265,124 servedWashington Ridge C.C.Natural background0.20 mg/LJul 202562 servedCity of WaterfordHuman impact clear4.27 mg/LMay 20268,788 servedWaterford - HickmanHuman impact likely2.32 mg/LApr 2026597 servedWaters Road Domestic Users Grouppurchased waterNatural background0.20 mg/LAug 202525 servedCity of WatsonvilleHuman impact clear3.10 mg/LMay 202665,231 servedWayside Motel Apartments Wtr SysHuman impact clear3.80 mg/LMar 202570 servedCity of WeedNatural background0.67 mg/LApr 20252,662 servedWegis Mutual Water CompanyHuman impact likely1.30 mg/LJul 202564 servedWendell Lane Mutual Water CompanyNatural background0.46 mg/LDec 202582 servedWest Almanor M.W.C.Natural background0.20 mg/LJun 20251,394 servedWest End Consolidated Water CompanyHuman impact likely1.00 mg/LMay 20260 servedWest End MwcHuman impact likely1.60 mg/LJan 202690 servedWest Kern Water DistrictNatural background0.68 mg/LJul 202420,500 servedWest Palm Springs VillageHuman impact clear3.20 mg/LJun 2025517 servedWest Park PropertiesHuman impact likely2.30 mg/LApr 2026112 servedCity of West SacramentoNatural background0.12 mg/LAug 202553,355 servedWest Tehachapi MutualHuman impact clear4.60 mg/LApr 2026150 servedWest Valley County Water DistrictHuman impact likely2.60 mg/LSep 2025798 servedWest Valley Mutual Water CompanyNatural background0.05 mg/LAug 202570 servedWest Valley Water DistrictHealth-study range7.40 mg/LJun 2026104,498 servedWest Water Company (Puc)Natural background0.20 mg/LNov 202540 servedWestborough Water Districtpurchased waterNatural background0.42 mg/LJun 202513,486 servedWestern Acres Mutual Water CompanyNatural background0.36 mg/LSep 2025380 servedWestern Heights Water CompanyHealth-study range7.50 mg/LJun 20267,705 servedWestern Hills Water District/Diablo GranNatural background0.38 mg/LMay 20262,000 servedWestern Mobile Home ParkHuman impact likely2.70 mg/LSep 2025178 servedWestern MwdNatural background0.20 mg/LMay 202686,062 servedWestern Mwd (Arlington)Human impact clear3.70 mg/LMay 20260 servedWestern Mwd (Id A - Rainbow)purchased waterNatural background0.68 mg/LApr 2026192 servedWestern Mwd - Murrieta DivisionNatural background0.22 mg/LFeb 202617,453 servedWestern Skies Mobile Home ParkNatural background0.60 mg/LApr 2025198 servedWesterner Mobile Home ParkHuman impact clear3.90 mg/LJan 202665 servedWesthaven C.S.D.Human impact clear3.00 mg/LMar 2026490 servedWestley Csdpurchased waterHealth-study range6.16 mg/LApr 202670 servedCity of WestminsterHuman impact likely2.32 mg/LMay 202690,911 servedCity of WestmorlandNatural background0.20 mg/LApr 20262,202 servedWestport County Water DistrictNatural background0.20 mg/LSep 2024369 servedWestside Park Mutual WaterHuman impact likely1.40 mg/LSep 2025495 servedWestwood C.S.D.Natural background0.22 mg/LJul 20251,662 servedCity of WheatlandHuman impact clear4.96 mg/LMar 20264,124 servedWheatland Park EstatesHuman impact clear3.38 mg/LMay 202526 servedWheeler Crest CsdNatural background0.56 mg/LApr 202686 servedWhispering Pines MhpHuman impact likely2.90 mg/LJul 202538 servedWhispering Pines Mobile Home ParkHuman impact likely1.21 mg/LApr 202625 servedWhite Fence Farms Mwc No. 1Natural background0.20 mg/LMay 20261,518 servedWhite Fence Farms Mwc No.3Natural background0.20 mg/LMay 2026749 servedWhite Mountain Mutual Water CompanyNatural background0.12 mg/LDec 2025142 servedWhite Oak Mutual Water CompanyHuman impact likely1.38 mg/LMay 2026415 servedWhittier-City, Water Dept.Human impact likely1.60 mg/LMar 202649,954 servedWilcox Station RanchNatural background0.20 mg/LAug 202331 servedWild Wings Golf CommunityNatural background0.20 mg/LMar 20261,115 servedWildewood East MutualHealth-study range9.69 mg/LApr 2026350 servedWildwood Mobile Home Pk IncNatural background0.12 mg/LDec 2025106 servedWilkinson Manor A-Zone Pwspurchased waterHuman impact clear4.20 mg/LFeb 2026125 servedWilliam Fisher Memorial Water CompanyNatural background0.71 mg/LFeb 202656 servedWilliams - Rc Farms WsNatural background0.80 mg/LApr 202635 servedWilliams Mutual Water CompanyHuman impact clear4.30 mg/LSep 2025165 servedCity of WillitsNatural background0.20 mg/LMar 20256,175 servedWillow County Water DistrictHuman impact likely1.00 mg/LSep 20253,797 servedWillow Mobile Home ParkNatural background0.20 mg/LJul 2025481 servedWillow Park MarinaNatural background0.05 mg/LMar 2026380 servedWillow Springs Mobile Home ParkHuman impact clear3.00 mg/LApr 2026275 servedWillows Mobile Home Community & Rv ParkHuman impact clear4.60 mg/LApr 2025261 servedWillowside Mutual Water CompanyNatural background0.20 mg/LFeb 2026448 servedWillowside Terrace Water AssociationNatural background0.50 mg/LNov 2025100 servedWilshire Heights Mutual Water CompanyNatural background0.20 mg/LFeb 202570 servedWilson Acres Mutual WaterHuman impact likely2.21 mg/LMay 202675 servedWilson Circle Mutual Water CompanyNatural background0.45 mg/LDec 2025158 servedWilsona Gardens MutualNatural background0.64 mg/LDec 2023129 servedWindflower Point Mutual Water CompanyNatural background0.74 mg/LMar 202625 servedTown of WindsorNatural background0.20 mg/LDec 202525,561 servedWine Country ApartmentsHuman impact likely1.60 mg/LMay 202540 servedWinterhaven County Water DistrictNatural background0.10 mg/LJan 2025394 servedWinterhaven Mobile EstatesHuman impact likely1.80 mg/LMay 202656 servedWinton Water & Sanitary DistHealth-study range6.10 mg/LApr 20259,745 servedWomack Subdivision M.W.C.Human impact likely1.60 mg/LFeb 202640 servedWonder Acres Water Systempurchased waterHuman impact clear3.10 mg/LMar 202692 servedWoodfords Mutual Water CompanyNatural background0.53 mg/LJul 202550 servedCity of WoodlakeHealth-study range7.50 mg/LDec 20257,846 servedCity of WoodlandNatural background0.12 mg/LFeb 202661,462 servedWoodland Heights MwcNatural background0.05 mg/LApr 202557 servedWoodland Park Mutual Water CoAbove the federal limit22.00 mg/LMay 2026538 servedWoodland-Davis Clean Water AgencyNatural background0.12 mg/LApr 20260 servedWoodlands DevelopmentHuman impact clear4.90 mg/LOct 20243,862 servedWoodridge Mutual Water CoNatural background0.20 mg/LMar 2026187 servedWoods, The (Mendocino)Natural background0.20 mg/LFeb 2026157 servedWoodside Rv ParkHuman impact clear4.60 mg/LMay 2026280 servedWoodside WaHuman impact likely1.00 mg/LMar 202673 servedWoodson Bridge MhpHuman impact likely1.20 mg/LJul 2025158 servedWoodson Bridge Rv ParkNatural background0.20 mg/LMay 202645 servedWoodstock RanchHuman impact likely2.70 mg/LFeb 2026325 servedWoodville Farm Labor CenterHealth-study range6.90 mg/LMay 2026650 servedWoodville Public Utility DistHealth-study range9.90 mg/LMay 20261,740 servedWynola Water DistrictNatural background0.20 mg/LFeb 2026140 served
Y
Yettem Water SystemHealth-study range7.60 mg/LMay 2026350 servedYmca Camp Marston/RaintreeNatural background0.58 mg/LMay 2026338 servedYokayo Tribe of IndiansHuman impact likely1.20 mg/LOct 202575 servedYokohl Mutual Water CoHealth-study range7.50 mg/LApr 202695 servedYolo Co Housing Authority-El Rio VillaHuman impact likely1.40 mg/LJul 2025432 servedYorba Linda Water DistrictHuman impact likely1.10 mg/LApr 202684,292 servedYosemite Forks Est MutualNatural background0.49 mg/LMay 2025110 servedYosemite Spring Park Util CoNatural background0.20 mg/LOct 20235,300 servedYosemite Terrace EstatesNatural background0.20 mg/LFeb 2025130 servedYosemite Vista EstatesHuman impact likely1.10 mg/LSep 202585 servedYosemite West Water SystemNatural background0.20 mg/LJan 2026420 servedTown of YountvilleNatural background0.05 mg/LJul 20252,787 servedYouth With A Mission-Springs of Living WNatural background0.20 mg/LMay 2024150 servedYuba Apartment HomesHuman impact clear3.69 mg/LJan 202640 servedCity of Yuba CityNatural background0.12 mg/LAug 202570,256 servedYucaipa Valley Water DistrictHealth-study range7.40 mg/LMay 202652,010 servedYuima Municipal Water DistrictHealth-study range5.60 mg/LApr 2026360 servedYuima Municipal Water District IdaHuman impact clear4.80 mg/LMay 2026769 servedYulicaNatural background0.20 mg/LJul 202525 servedYulupa Mutual Water CompanyHuman impact likely1.20 mg/LMay 2026200 served
Z
Z Ranch MwcHealth-study range5.30 mg/LApr 202662 servedZone 7 Water AgencyHuman impact clear4.06 mg/LMay 202640 servedZonneveld Dairy - CeriniHealth-study range6.20 mg/LApr 202662 served

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NitrateSmart

Nitrate in community water systems, from the utilities’ own compliance reporting.

Results reaching back to July 2023 · current through August 9, 2026.

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