Idaho

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Idaho system directory

Find a community water system

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

767

systems with a current result

1,566,791

people served by them

12

systems carrying a supplier result

54

systems at or above 5 mg/L

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.

Showing 767 of 767 systems

0-9

3D Water AssociationHuman impact likely1.94 mg/LSep 2025680 served

A

City of AberdeenHuman impact likely2.25 mg/LAug 20252,088 served Ahsahka Water And Sewer DistNatural background0.05 mg/LDec 202585 served City of AlbionNatural background0.84 mg/LApr 2025325 served Algoma Addition SubdNatural background0.29 mg/LMar 202668 served Alpine Meadows Water And Sewer DistNatural background0.89 mg/LFeb 2025265 served City of American FallsHuman impact clear3.15 mg/LMay 20264,863 served City of AmmonHuman impact likely2.65 mg/LJun 202517,338 served Amy Trailer ParkHuman impact likely2.10 mg/LMar 202646 served Anderson Circle Water CorpHuman impact likely2.60 mg/LFeb 202640 served Antelope Creek Living CenterNatural background0.05 mg/LAug 202527 served Apache Heights Subdivision (2)Health-study range6.90 mg/LFeb 2026110 served Apex Living CommunityNatural background0.05 mg/LJan 2026150 served Appaloosa CommunityNatural background0.51 mg/LAug 2025129 served City of ArcoHuman impact likely1.06 mg/LApr 20261,080 served City of ArimoNatural background0.05 mg/LApr 2026368 served Arrow Point Parkpurchased waterNatural background0.08 mg/LJan 2026275 served Arrowhead Ranch Water Company LlcNatural background0.05 mg/LMar 202630 served Arrowrock RanchHuman impact likely2.90 mg/LDec 2025250 served Ashley Estates Water AssnHuman impact likely1.75 mg/LApr 202638 served City of AshtonHealth-study range7.58 mg/LJan 20261,129 served Aspen Creek Water CompanyHuman impact likely1.45 mg/LJun 202664 served Aspen Hollow Homeowners AssocNatural background0.30 mg/LJan 202675 served Aspen Ridge SubdNatural background0.05 mg/LOct 2025204 served City of AtholHuman impact likely1.14 mg/LMar 2026990 served Atlanta Water AssnNatural background0.05 mg/LSep 202591 served Atlas AcresNatural background0.49 mg/LMar 2026160 served Atomic Water WorksHuman impact likely1.63 mg/LNov 202535 served Aurora SubdNatural background0.05 mg/LApr 202530 served Autumn Cove Mobile Home CourtHuman impact likely2.37 mg/LAug 202538 served Avery Water And Sewer DistNatural background0.21 mg/LJan 2026114 served Avondale Irrigation DistHuman impact likely1.56 mg/LMay 20268,785 served

B

Bailey Creek Property Owners AssnHuman impact likely1.22 mg/LDec 2025250 served Baldy Ridge EstatesNatural background0.66 mg/LMar 202650 served City of BancroftHuman impact clear4.98 mg/LDec 2025350 served Banida Water And Sewer DistHealth-study range6.46 mg/LFeb 2026180 served City of BasaltHuman impact likely2.80 mg/LOct 2025425 served Bayview Water And Sewer DistNatural background0.12 mg/LSep 20251,320 served Bear Claw SubdNatural background0.13 mg/LJun 202670 served Bear Island Water AssnNatural background0.05 mg/LJun 2025100 served Bear Lake WestNatural background0.05 mg/LSep 2025100 served Bear Lake West PoaNatural background0.74 mg/LMar 2025300 served Bee Line Water Assn IncNatural background0.05 mg/LMar 2026533 served Belle Aire Acres 2Health-study range5.50 mg/LFeb 2026350 served City of BellevueHuman impact likely1.31 mg/LMar 20262,747 served Bennington Water SystemHuman impact clear3.31 mg/LOct 2025250 served Berry Patch Water Acres AssnNatural background0.19 mg/LMay 202645 served Birch Creek CulinaryNatural background0.05 mg/LJun 2026120 served Bittercreek Meadows SubdivisionNatural background0.05 mg/LDec 202575 served Black Rock Utilities IncNatural background0.12 mg/LNov 20251,014 served City of BlackfootHuman impact clear3.36 mg/LDec 202513,224 served Blackhawk Estates/Iron RimHuman impact likely1.06 mg/LNov 2024270 served Blackhawk On The RiverNatural background0.05 mg/LFeb 2026150 served Blanchard Coop Water AssnNatural background0.89 mg/LMar 2026180 served City of BlissHuman impact clear4.69 mg/LNov 2025384 served City of BloomingtonNatural background0.05 mg/LSep 2025206 served Blue Sage SubdivisionNatural background0.70 mg/LJan 2026112 served Boise Holcomb Water Users Assoc. IncNatural background0.05 mg/LJan 202636 served City of Bonners FerryNatural background0.10 mg/LJan 20263,367 served Bonneville Acres Water Users Assn IncHuman impact likely2.78 mg/LMar 2026100 served Bonnie Laura SubdNatural background0.05 mg/LNov 202560 served Bovill Water DeptNatural background0.47 mg/LOct 2025256 served Broadway ApartmentsNatural background0.05 mg/LMay 202672 served Brookhaven Water AssnHuman impact likely2.35 mg/LJan 202633 served Bruneau Water And Sewer DistNatural background0.05 mg/LMay 2025220 served City of BuhlHuman impact clear3.01 mg/LJan 20264,518 served Burley Water DeptHuman impact likely1.40 mg/LMay 202610,345 served Burnie SubdHuman impact likely1.00 mg/LJan 202655 served City of ButteNatural background0.05 mg/LOct 202559 served

C

Cabinet Mountains Water DistNatural background0.23 mg/LMay 20262,335 served Calder Water And Sewer DistrictNatural background0.12 mg/LJan 202680 served City of CaldwellHuman impact likely2.30 mg/LApr 202674,000 served Caldwell Housing AuthorityHealth-study range5.50 mg/LJun 20251,100 served Camas Estates Water UsersHuman impact likely1.10 mg/LJun 202650 served City of CambridgeNatural background0.05 mg/LDec 2025335 served Camelot Water Assn IncHuman impact likely2.90 mg/LNov 2025157 served Canyon Creek Mobile Home ParkHuman impact clear4.80 mg/LMar 2026243 served Canyon Estates Water SystemNatural background0.05 mg/LDec 202550 served Capitol Water CorpHuman impact clear4.00 mg/LNov 20259,000 served Carey Water And SewerHuman impact likely1.11 mg/LNov 2025993 served Caribou AcresHealth-study range5.55 mg/LMay 2026150 served Carlin Bay Property Owners AssociationNatural background0.05 mg/LJul 2025220 served City of CascadeNatural background0.05 mg/LMay 20251,000 served Cassandra Hills Owners AssnNatural background0.05 mg/LFeb 202657 served Castle Mountain Creeks Owners AssnNatural background0.30 mg/LApr 2026250 served City of CastlefordHealth-study range5.31 mg/LAug 2025275 served Cataldo Water DistNatural background0.20 mg/LJul 2025680 served Cave Bay Community SystemNatural background0.38 mg/LDec 2025458 served Cedar Butte SubdivisionNatural background0.05 mg/LMar 2026300 served Cedar Point SubdivisionHuman impact likely1.12 mg/LMar 202663 served Cedar Springs Community WaterNatural background0.07 mg/LApr 2025130 served Central Shoshone County Water DistNatural background0.10 mg/LSep 20256,098 served Chalet Mobile Home ParkNatural background0.30 mg/LJan 202560 served City of ChallisNatural background0.05 mg/LApr 2026900 served Chaparral Water AssnNatural background0.90 mg/LApr 2026100 served Chateaux Water Assn IncHuman impact likely2.53 mg/LJun 2026275 served Cherry Ridge RehabNatural background0.05 mg/LNov 202550 served Chilco Service AreaNatural background0.92 mg/LMar 2026563 served Christis Mobile ParkNatural background0.60 mg/LJan 202650 served City of ChubbuckHuman impact clear4.20 mg/LMay 202615,842 served City of Clark ForkNatural background0.12 mg/LMar 2026730 served Clark Theurer Water AssnHuman impact likely2.80 mg/LMay 2025155 served Clarkia Water And Sewer DistNatural background0.05 mg/LSep 202553 served Clear Lake Ranch P U DHuman impact likely2.27 mg/LJun 202654 served Clearwater Water DistNatural background0.05 mg/LDec 202580 served City of CliftonHuman impact clear3.06 mg/LMay 2025413 served City of Coeur D AleneHuman impact likely1.61 mg/LJul 202554,115 served Colburn Water AssnNatural background0.05 mg/LMar 2026290 served Cold Springs SubdNatural background0.30 mg/LJan 2026300 served Comeback Bay Water AssnNatural background0.84 mg/LMar 202630 served Comore LomaHuman impact likely1.87 mg/LOct 20251,500 served Cone Delfred SubdNatural background0.05 mg/LJan 202640 served Conkling Park Water AssnNatural background0.05 mg/LSep 2025309 served Cottonwood Acres 3 & 5Human impact likely1.57 mg/LSep 202560 served Cottonwood Acres Div 4Human impact likely1.21 mg/LSep 202543 served Cottonwood Point Water AssnHuman impact likely2.58 mg/LJun 2025151 served Cottonwood Water DeptNatural background0.05 mg/LJun 2026977 served Cougar Bay Water AssociationNatural background0.42 mg/LSep 2025230 served Cougar Creek Water AssnNatural background0.05 mg/LJan 2026270 served Cougar Ridge Water & SewerNatural background0.05 mg/LJun 2026173 served City of CouncilNatural background0.30 mg/LSep 2025900 served Country Club EstatesHuman impact likely2.33 mg/LJan 2026137 served Country Club Subdivisions Water AssnNatural background0.20 mg/LMar 2026120 served Country Court CommunityHuman impact clear3.60 mg/LSep 202589 served Country Haven UtilitiesHuman impact clear3.23 mg/LMar 2026150 served Country Homes Mobile ParkNatural background0.26 mg/LJan 202690 served Country Life EstatesHuman impact likely1.86 mg/LSep 2025250 served Country Living CenterHuman impact likely1.24 mg/LJan 202630 served Country Meadows SubdHealth-study range5.50 mg/LNov 202535 served Country Squire EstatesHuman impact likely1.12 mg/LApr 2026450 served Countryside VillageHealth-study range5.99 mg/LNov 2024108 served Covert Water Users AssociationHuman impact likely2.34 mg/LMay 2026250 served Cow Creek Water AssnNatural background0.20 mg/LJul 202528 served City of CraigmontHealth-study range6.13 mg/LMar 2026501 served Cub River AcresNatural background0.05 mg/LJul 2025180 served City of CuldesacHuman impact likely2.93 mg/LApr 2026382 served Curley Creek Water AssnNatural background0.05 mg/LMar 202650 served

D

D And M Water AssnHuman impact likely2.76 mg/LJun 2026142 served D And S Purple Sage RanchettesHealth-study range9.91 mg/LApr 202670 served Dahl SubdHuman impact likely1.60 mg/LDec 202551 served Dalton Water Assn IncHuman impact likely2.24 mg/LSep 20252,598 served Danskin Properties Association IncNatural background0.30 mg/LJan 202652 served Darby Water AssnNatural background0.05 mg/LSep 202558 served Day StarNatural background0.05 mg/LMar 2026250 served City of DaytonNatural background0.05 mg/LMay 2026510 served City of DearyNatural background0.05 mg/LMar 2026529 served Decker AdditionNatural background0.05 mg/LMar 202655 served City of DecloHuman impact likely2.10 mg/LMar 2026300 served Decoy Inn And Rv ParkNatural background0.05 mg/LJan 202575 served Deep Creek Water CompanyNatural background0.16 mg/LMar 202630 served Del Rio EstatesNatural background0.30 mg/LJan 202560 served Dell Subd Water AssnNatural background0.05 mg/LMar 202630 served Desert View Estates Water CorpHuman impact clear4.10 mg/LJun 2026650 served Diamond Benchview Water CorpNatural background0.11 mg/LApr 2026115 served Dietrich Water SystemNatural background0.61 mg/LSep 2023332 served Dj Park WellHuman impact likely2.71 mg/LMar 202635 served City of DonnellyNatural background0.05 mg/LSep 2025237 served City of DoverNatural background0.09 mg/LJan 2026865 served City of DowneyHuman impact likely1.50 mg/LJul 2025625 served Drake SubdAbove the federal limit12.20 mg/LDec 2025150 served City of DriggsHuman impact likely1.22 mg/LMay 20262,200 served Dry Acres Water And Sewer DistNatural background0.70 mg/LJun 202675 served Dry Creek Water Company LlcHuman impact clear4.10 mg/LNov 20251,125 served City of DuboisNatural background0.05 mg/LMar 2026511 served Dufort Water AssociationHuman impact likely1.12 mg/LMar 2026216 served Duquette Pines Homeowners AssociationNatural background0.05 mg/LAug 2025163 served

E

E Shoshone County Water Dist BurkeNatural background0.05 mg/LApr 202545 served E Shoshone County Water Dist MullanNatural background0.05 mg/LApr 2025840 served E Shoshone County Water Dist WallaceNatural background0.05 mg/LApr 20252,388 served City of Eagle - AvimorHuman impact clear4.10 mg/LJan 2026490 served City of Eagle - ValnovaNatural background0.30 mg/LJan 2026490 served Eagle Glen Homeowners Assn IncNatural background0.30 mg/LMar 2026300 served Eagle Meadows MhpNatural background0.05 mg/LNov 2025195 served Eagle MhcHuman impact likely2.20 mg/LApr 2026135 served Eagle Point CommunityNatural background0.90 mg/LMar 2026150 served Eagle West Subd Water AssnHuman impact clear3.20 mg/LMar 202692 served Eagle, City of (Eastern Zone)Human impact clear3.40 mg/LJan 20263,702 served Eagle, City of (Western Zone)Natural background0.05 mg/LJan 20266,108 served Eagles Pointe SubdivisionNatural background0.05 mg/LJan 2026110 served East Greenacres Irrigation DistHuman impact likely2.90 mg/LMar 202611,165 served East Hope Water DeptNatural background0.05 mg/LFeb 2026445 served East Lizard Butte Water CorpNatural background0.05 mg/LDec 202595 served East Seasons AcresNatural background0.26 mg/LMar 202663 served Eaton Mobile Home CourtAbove the federal limit32.60 mg/LMay 202694 served Edelweiss Village First Additionpurchased waterNatural background0.08 mg/LFeb 202670 served City of EdenHuman impact likely2.15 mg/LSep 2025411 served Edgemere IiiNatural background0.60 mg/LMar 202660 served Edgemont SubdNatural background0.05 mg/LDec 202540 served Ee Dah How Acres SubdHuman impact clear3.38 mg/LDec 202569 served Eight Mile PrairieNatural background0.70 mg/LSep 202568 served El Rancho HeightsNatural background0.05 mg/LNov 2025300 served Elk Bend Unit 1Natural background0.05 mg/LAug 2025200 served Elk City Water And Sewer AssnNatural background0.05 mg/LNov 2025320 served Elk MeadowsNatural background0.05 mg/LApr 2026100 served City of Elk RiverNatural background0.05 mg/LSep 2025165 served Elkhorn RanchNatural background0.82 mg/LSep 2025278 served Emerald Estates Water Assn IncHuman impact likely1.96 mg/LAug 2025485 served Emida Water And Sewer AssociationNatural background0.12 mg/LSep 2025120 served City of EmmettNatural background0.05 mg/LMar 20266,700 served Equestrian EstatesHuman impact clear3.51 mg/LJun 202688 served Evans Water CorpHuman impact likely2.50 mg/LMar 2025137 served Evergreen Acres SubdHuman impact likely2.51 mg/LMay 202625 served Evergreen Community LlcNatural background0.05 mg/LMar 202565 served Evergreen Heights SubdNatural background0.05 mg/LSep 202525 served Evergreen Mobile ParkNatural background0.30 mg/LJan 2026284 served Evergreen Terrace Water AssociationNatural background0.60 mg/LMay 202685 served

F

City of FairfieldNatural background0.30 mg/LJun 2026441 served Fairview Water DistHuman impact likely2.29 mg/LDec 20251,300 served Falcon Ridge SubdivisionHuman impact likely1.84 mg/LJan 202675 served Falls Water Company IncHuman impact likely2.24 mg/LSep 202522,650 served Farragut Village Property Assn IncNatural background0.78 mg/LMar 2025130 served Featherville Townsite Water CorpNatural background0.05 mg/LMar 202660 served Fenn Community SystemHuman impact likely1.89 mg/LAug 202530 served City of FerdinandHealth-study range8.87 mg/LJun 2026133 served Fernan Estates CorporationNatural background0.05 mg/LDec 202537 served Fernwood Water DistNatural background0.11 mg/LMar 2026580 served Filer Water WorksNatural background0.30 mg/LJan 20262,858 served Fir Grove EstatesNatural background0.05 mg/LMar 2026270 served City of FirthHuman impact likely2.04 mg/LJun 2026511 served Fish Haven Pipeline CompanyNatural background0.05 mg/LSep 2025400 served Flying H Trailer RanchHuman impact likely1.90 mg/LMar 2026430 served Flying W RanchNatural background0.24 mg/LSep 202546 served Forrey HeightsHuman impact likely1.40 mg/LJan 202649 served Four Seasons Water CompanyHealth-study range5.03 mg/LApr 202696 served Fox Creek Country Club EstatesHuman impact likely2.15 mg/LOct 2025250 served City of FranklinNatural background0.05 mg/LMar 20261,000 served Franklin Domestic Water UsersHuman impact likely1.30 mg/LMar 202675 served City of FruitlandNatural background0.50 mg/LJan 20267,135 served

G

Gannett Homeowners AssnHuman impact likely2.05 mg/LDec 202560 served Garden City Water And Sewer SystemNatural background0.05 mg/LJan 202612,500 served Garden Valley Ranchettes HomeownersHuman impact likely1.10 mg/LJul 202578 served Garwood Water CoopNatural background0.56 mg/LAug 2025398 served Gem State - Bar Circle S RanchHuman impact likely1.31 mg/LJun 2026633 served Gem State - Bitterroot Water CompanyNatural background0.77 mg/LJun 2026428 served Gem State - Diamond Bar EstatesNatural background0.81 mg/LJun 2026143 served Gem State - Happy Valley Water SystemHuman impact likely1.84 mg/LJun 202660 served Gem State - Lynnwood EstatesNatural background0.44 mg/LJun 202660 served Gem State - Spirit Lake EastNatural background0.35 mg/LJun 2026843 served Gem State AcademyHuman impact clear3.00 mg/LJan 2026121 served City of GeneseeHuman impact likely2.17 mg/LDec 20251,044 served City of GeorgetownNatural background0.05 mg/LMar 2026476 served City of Glenns FerryHealth-study range5.90 mg/LApr 20261,282 served Golden Eagle RanchNatural background0.30 mg/LDec 2025120 served Golden Rail Trailer CourtHealth-study range6.39 mg/LApr 202670 served Golf Club Estates Water IncHuman impact likely1.74 mg/LJan 2026140 served City of GoodingHuman impact likely1.78 mg/LMar 20263,706 served Goose Creek RentalsHealth-study range5.00 mg/LJun 202626 served Gotham Bay EstatesNatural background0.05 mg/LApr 202661 served Gozzer RanchNatural background0.08 mg/LJan 2026470 served City of GraceNatural background0.05 mg/LFeb 2026920 served City of Grand ViewHealth-study range5.60 mg/LJan 2026452 served Grangeville Water DeptNatural background0.05 mg/LMar 20263,151 served Greenferry Water & Sewer DistrictNatural background0.69 mg/LJan 2025978 served Greenfield Water And SewerHuman impact likely2.07 mg/LMar 2026240 served Greenhills Estates 3Health-study range6.00 mg/LFeb 2026200 served Greenhorn SubdNatural background0.30 mg/LJan 202675 served City of GreenleafNatural background0.05 mg/LMay 2026846 served Grouse Point Water Company LlcNatural background0.05 mg/LDec 202570 served Grove Creek Subd Water AssnNatural background0.24 mg/LNov 202530 served Groveland Water And Sewer DistNatural background0.05 mg/LJun 2026295 served

H

H And L ParkNatural background0.60 mg/LFeb 202643 served Hackney Water And Sewer DistNatural background0.60 mg/LSep 2025108 served City of HagermanHuman impact likely2.31 mg/LAug 2025988 served Hailey Water And SewerHuman impact likely1.18 mg/LDec 20258,000 served Hamilton PlaceHealth-study range5.50 mg/LJan 202697 served Hammett Haven ApartmentsHealth-study range5.30 mg/LOct 202364 served Hampton Homes Home Owners AssnHuman impact likely2.50 mg/LNov 202595 served City of HansenHuman impact clear4.21 mg/LJul 20251,200 served Harbor View Estates Water & Sewer DistNatural background0.12 mg/LAug 2025355 served Harding Acres Tracts Water Assn IncNatural background0.12 mg/LJun 202664 served City of HarrisonNatural background0.05 mg/LSep 2025456 served Hauser Lake HeightsHuman impact likely2.77 mg/LAug 2025257 served Hauser Lake Water Assn IncHuman impact likely1.74 mg/LMar 20251,575 served Hawks Bay Estates Hoa LlcNatural background0.05 mg/LMar 202659 served Hayden Haven / Gem ShoresNatural background0.12 mg/LMar 2026236 served Hayden Lake Irrigation DistHuman impact likely2.06 mg/LJul 20259,375 served Hayden Orchards Water SystemNatural background0.75 mg/LMar 2026122 served Hayden Pines Grouse MeadowsNatural background0.94 mg/LMar 20261,188 served City of HazeltonHuman impact likely2.23 mg/LAug 2025899 served Heatherlands SubdNatural background0.30 mg/LDec 2025200 served City of HeyburnNatural background0.30 mg/LFeb 20263,000 served Heyburn EstatesNatural background0.30 mg/LFeb 2026100 served Hi View WaterHuman impact likely1.80 mg/LMay 202555 served Hidden Hill Mobile Home ParkNatural background0.31 mg/LJan 202640 served Hidden Pines Trailer ParkNatural background0.05 mg/LDec 202562 served Hidden Valley Water Assnpurchased waterHuman impact likely2.90 mg/LMar 2026120 served Hidden Village Mhp, LlcHuman impact likely2.77 mg/LJan 202666 served Highway 54 Water Association, IncNatural background0.18 mg/LMay 2026100 served Highway Estates Water AssnHuman impact likely1.54 mg/LJul 202565 served Hillman Trailer CourtNatural background0.05 mg/LSep 202545 served Hillsdale Estates Homeowners AssnNatural background0.05 mg/LNov 2025800 served Hillside Service AreaNatural background0.22 mg/LMar 20264,140 served Hillview SubdHuman impact likely1.47 mg/LSep 202550 served Holiday Acres Water AssnNatural background0.17 mg/LSep 2025480 served Holiday Highway SubdNatural background0.76 mg/LDec 202545 served City of HollisterHealth-study range6.58 mg/LAug 2025220 served City of HomedaleNatural background0.05 mg/LMar 20262,999 served Hoo Doo Harvard Water And Sewer DistNatural background0.05 mg/LMar 202582 served Hope House (Owyhee)Natural background0.05 mg/LJan 202678 served Hope Water SystemNatural background0.07 mg/LFeb 2026180 served Horizon Ridge SubdivisionNatural background0.12 mg/LMar 202675 served Horseshoe Bend Water SupplyNatural background0.05 mg/LSep 2025750 served Horseshu Vue Ranch SubdHuman impact clear3.70 mg/LDec 202551 served Howe TownsiteNatural background0.05 mg/LSep 202555 served Hoyt Bluff Water AssociationHuman impact likely2.79 mg/LDec 2025151 served Huckleberry Bay Water SystemNatural background0.07 mg/LApr 2026362 served City of HuetterNatural background0.48 mg/LFeb 202670 served Hulen Meadows Water CompanyNatural background0.50 mg/LMay 2026390 served

I

Idaho City Water DeptNatural background0.04 mg/LNov 2025478 served Idaho ClubNatural background0.05 mg/LSep 2025300 served City of Idaho FallsHuman impact likely1.53 mg/LSep 202569,450 served Idaho West EstatesNatural background0.05 mg/LMay 202698 served Idaho Youth Ranch Hands of PromiseHuman impact likely2.39 mg/LFeb 202695 served Idjc Juvenile Corrections CenterNatural background0.05 mg/LJul 2025280 served Idle Wheels Mhp Cat LlcNatural background0.05 mg/LDec 202585 served Idoc Idaho State Correctional CenterHuman impact clear3.50 mg/LAug 20252,204 served Idoc Mountain View Transformation CenterNatural background0.05 mg/LAug 2025456 served Idoc Sbx ComplexHuman impact likely1.62 mg/LAug 20253,309 served Indian VillageHealth-study range5.00 mg/LDec 2025225 served City of InkomHuman impact likely1.48 mg/LMay 2026792 served Iona Water DeptHuman impact likely1.58 mg/LJun 20252,717 served Ireland Acres 1Human impact likely1.12 mg/LOct 202554 served IronwoodHuman impact likely2.48 mg/LOct 2025125 served Island Village Mobile Home ParkNatural background0.90 mg/LMar 202670 served

J

J And K Water CorpHuman impact likely1.61 mg/LDec 2025370 served Jackalope AssnHuman impact likely1.01 mg/LMar 202528 served Jbs Country CourtNatural background0.30 mg/LDec 2025140 served Jefferson Greens EstatesNatural background0.05 mg/LSep 2025193 served Jenco AcresHuman impact likely2.73 mg/LSep 2025105 served City of JeromeHuman impact likely2.75 mg/LSep 202513,135 served Journeys EndHuman impact likely2.53 mg/LApr 2026180 served Jug Mountain Ranch SubdivisionNatural background0.60 mg/LJan 2026100 served Jughandle EstatesNatural background0.30 mg/LJan 2026200 served City of JuliaettaHuman impact likely2.10 mg/LJun 2026624 served

K

City of KamiahNatural background0.05 mg/LDec 20251,495 served Kamiah Valley Company LlcHuman impact likely2.60 mg/LJun 2026250 served Kanaka Rapids Ranch Water System IncNatural background0.30 mg/LJan 2026220 served Kaniksu Shores EstatesNatural background0.45 mg/LMar 202682 served Karcher Acres SubdHuman impact likely1.90 mg/LNov 2025100 served Karcher Ranchette Water CorpHealth-study range5.30 mg/LNov 2025213 served Karey Lane Well IncHuman impact likely1.40 mg/LMar 202638 served City of KendrickHuman impact clear3.21 mg/LAug 2025313 served City of KetchumHuman impact likely1.04 mg/LSep 20253,555 served Kidd Island Bay Water UsersNatural background0.05 mg/LDec 2025153 served City of KimberlyHuman impact clear4.97 mg/LMar 20265,359 served Kimpton Acres Third SubdHealth-study range9.80 mg/LApr 202688 served King Hill Domestic Water And SewerNatural background0.05 mg/LMar 202687 served Kings Pines Estates Water SystemNatural background0.05 mg/LSep 202596 served Kingston Water Dist 1Natural background0.13 mg/LFeb 2026585 served Klugherz Water CorpNatural background0.20 mg/LJun 2026200 served Kooskia Water DeptNatural background0.05 mg/LDec 2025607 served Kootenai County Water Dist 1Natural background0.09 mg/LJan 2026843 served Kootenai HeightsNatural background0.05 mg/LMar 202625 served Krizview ParkHuman impact likely1.60 mg/LMar 2026120 served Kullyspell EstatesNatural background0.09 mg/LDec 202592 served City of KunaNatural background0.05 mg/LJun 202532,038 served

L

Laceys Vista Acres Water CorpHuman impact likely1.21 mg/LJun 2026200 served Laclede Water DistNatural background0.05 mg/LMay 2026668 served Lake Forest Homes Assn IncHuman impact likely1.32 mg/LJan 202698 served Lakeland MeadowsNatural background0.28 mg/LNov 202525 served Lakeridge Second SubdHuman impact clear4.84 mg/LAug 202550 served Lakeview Hills Water Users AssociationHuman impact likely1.60 mg/LDec 2025160 served Lakeview Water Company 1Natural background0.14 mg/LJun 2025100 served Lakeview Water DistrictNatural background0.05 mg/LDec 202545 served Lakeys Cafe And Trailer ParkNatural background0.60 mg/LFeb 2026300 served Lansing MeadowsHuman impact likely1.00 mg/LNov 2025320 served City of LapwaiHuman impact clear3.11 mg/LJan 2026325 served City of Lava Hot SpringsNatural background0.05 mg/LAug 2025386 served Lawyers Creek Water DistHuman impact clear3.06 mg/LDec 202550 served Lazy Eight EstatesHuman impact likely2.37 mg/LMay 202660 served Lazy River Mobile Home Park 1Natural background0.05 mg/LJun 202641 served Leisure Acres Trailer CourtNatural background0.10 mg/LJan 2025180 served Leisure Heights Homeowners AssociationHealth-study range5.00 mg/LNov 2025142 served Leisure ParkNatural background0.88 mg/LAug 2025381 served City of LewistonHuman impact likely2.28 mg/LMay 202615,001 served Lewiston Orchards Irrigation DistNatural background0.05 mg/LFeb 202620,000 served Liberty EstatesHuman impact likely1.11 mg/LJan 2026300 served Linda Vista Mobile Home ParkHuman impact clear3.70 mg/LMar 2026125 served Lindenwood Water AssnHuman impact likely2.90 mg/LApr 202648 served Little Blacktail Ranch Water DistrictHuman impact likely1.82 mg/LSep 202595 served Locust SubdHealth-study range7.80 mg/LJun 202642 served Lodge Haven Water CompanyNatural background0.29 mg/LMar 202637 served Loma Linda Water CorpNatural background0.05 mg/LDec 202570 served Lone Mountain EstatesHuman impact likely1.13 mg/LApr 2024448 served Lost Creek Estates WaterNatural background0.86 mg/LFeb 2026277 served

M

M & T Water CorpHealth-study range6.10 mg/LApr 2026100 served M And M Mountain View Subd Em2Health-study range5.30 mg/LMay 202654 served M And T Water And Sewer DistNatural background0.05 mg/LSep 2025358 served City of MackayNatural background0.05 mg/LOct 2025566 served Malabar Mobile Home ParkNatural background0.44 mg/LSep 202560 served City of MaladHuman impact clear3.22 mg/LNov 20232,200 served Malad And Hilton Water Company Inc.Human impact clear3.90 mg/LFeb 202670 served Mangum Heights SubdHealth-study range5.77 mg/LJan 202675 served City of MarsingHuman impact likely2.50 mg/LJan 20261,300 served Maverick Subd Lasher ConstructionHuman impact clear4.37 mg/LApr 202690 served City of MccallNatural background0.05 mg/LDec 20254,423 served City of MccammonNatural background0.05 mg/LMar 2026800 served Mcguire Estates Water UsersNatural background0.21 mg/LDec 2025158 served Meadow Creek Property Owners Assn IncNatural background0.05 mg/LApr 2026800 served Meadow Lark Court LlcAbove the federal limit16.94 mg/LOct 202445 served Meadow Wood Water SystemNatural background0.34 mg/LSep 202552 served Meadowland AcresNatural background0.42 mg/LMar 202663 served Meadows At West MountainNatural background0.05 mg/LJan 2026550 served Meadows Mobile ParkNatural background0.90 mg/LJan 2026175 served Meander Point SubdHealth-study range6.42 mg/LJun 2026140 served City of MelbaHealth-study range8.30 mg/LMay 2026648 served Mellen Subd Water Distpurchased waterHuman impact likely1.00 mg/LSep 2025250 served Meridian Water DeptNatural background0.80 mg/LJun 2026147,340 served Mid Valley Water Company LlcNatural background0.30 mg/LNov 2025450 served City of MiddletonNatural background0.60 mg/LJan 202613,190 served Midvale Water SystemNatural background0.05 mg/LJan 2026144 served Midway Water System IncNatural background0.05 mg/LDec 202550 served Miller Country EstatesHuman impact likely2.08 mg/LApr 202683 served City of MinidokaHuman impact likely1.28 mg/LFeb 2025120 served Mink Creek Mountain EstatesNatural background0.05 mg/LJun 202527 served Mission Creek Water AssnNatural background0.05 mg/LMar 2026263 served Monastery of St GertrudesNatural background0.05 mg/LFeb 2026200 served City of MontpelierHuman impact likely1.17 mg/LJul 20252,772 served Moore Water And Sewer AssnNatural background0.05 mg/LAug 2025196 served Moose MountainNatural background0.05 mg/LJun 202627 served Moravia Water AssnNatural background0.05 mg/LMar 202680 served Moreland Country CourtHuman impact likely2.26 mg/LMay 202660 served Moreland Water And Sewer DistrictHuman impact likely1.93 mg/LApr 2026364 served Mores Creek Rim Ranch Water DistHuman impact likely1.64 mg/LDec 2025140 served Morning View Water CompanyNatural background0.05 mg/LAug 2023459 served Morrison Estates Homeowner Water AssnHuman impact likely2.11 mg/LJun 202680 served Moscow Water DeptNatural background0.05 mg/LAug 202526,000 served City of Mountain HomeHuman impact likely1.00 mg/LSep 202514,651 served Mountain Home Air Force BaseHealth-study range8.30 mg/LFeb 20267,500 served Mountain SageHuman impact likely1.10 mg/LJan 202665 served Mountain Shadows Hoa Inc.Natural background0.05 mg/LJun 202589 served Mountain Springs Water CorporationNatural background0.76 mg/LAug 2025338 served Mountain View At Farragut ParkNatural background0.14 mg/LSep 202562 served Mountain View CourtHuman impact likely1.25 mg/LJan 202640 served Mountain View EstatesNatural background0.36 mg/LJan 202643 served Mountain View ParkHuman impact likely1.13 mg/LSep 202597 served Mountain View Rv WestNatural background0.05 mg/LJan 202675 served Mountain View TerraceNatural background0.78 mg/LMar 2026445 served Mountain View Water And Road AssnNatural background0.50 mg/LMar 2026305 served Mountain View Water CorpHuman impact likely1.88 mg/LApr 202560 served City of Moyie SpringsNatural background0.19 mg/LNov 20251,123 served Murphy Water SystemHuman impact clear4.10 mg/LJul 202575 served Murray Water Assn IncNatural background0.09 mg/LFeb 202635 served City of MurtaughHuman impact clear4.31 mg/LDec 2025130 served

N

City of NampaNatural background0.50 mg/LMay 2026100,200 served New Hope SubdNatural background0.05 mg/LFeb 2026100 served New Horizons Water IncHuman impact clear4.73 mg/LAug 202585 served City of New MeadowsNatural background0.05 mg/LApr 2026582 served City of New PlymouthNatural background0.05 mg/LDec 20251,600 served City of NewdaleHuman impact likely1.60 mg/LMar 2026340 served Nezperce Water DeptHealth-study range7.08 mg/LMar 2026460 served Nielsons Country CourtHuman impact clear3.22 mg/LDec 202570 served North Fork Water WorksNatural background0.05 mg/LMar 202664 served North Hills Mobile VillageNatural background0.05 mg/LMar 202663 served North Idaho Correctional InstituteNatural background0.51 mg/LApr 2026425 served North Rim FairwaysNatural background0.66 mg/LOct 2025150 served North Tomer Butte W&S DistrictHuman impact clear4.35 mg/LMar 2026259 served Northridge Estates Water AssnHuman impact likely2.50 mg/LMar 202675 served Northside Estates Hoa IncHuman impact likely1.20 mg/LFeb 2026100 served Northside Estates WellHuman impact likely1.70 mg/LApr 202630 served Northside Water Users Assnpurchased waterNatural background0.08 mg/LFeb 2026413 served Northstar SubdivisionHuman impact clear4.10 mg/LJun 202550 served Northview SubdivisionHuman impact likely2.21 mg/LAug 202547 served City of NotusNatural background0.20 mg/LApr 2026539 served Nur Water AssnHuman impact likely2.31 mg/LJan 202660 served

O

Oakdell Farms LlcHealth-study range7.16 mg/LApr 202675 served Oakleaf SubdivisionHuman impact likely1.80 mg/LJan 202671 served City of OakleyNatural background0.30 mg/LSep 2025821 served Oakley Valley Water CorporationHuman impact likely1.92 mg/LJul 2025500 served Oden View Estates Improvement AssnNatural background0.05 mg/LJan 202564 served Oden Water Assn IncNatural background0.05 mg/LJun 20261,524 served Ohio Match EstatesHuman impact likely1.66 mg/LJun 2025118 served Ohio Match Road Water DistHuman impact likely1.05 mg/LDec 2025245 served Ok Water AssnHuman impact clear4.00 mg/LMay 2026140 served Onaway Water And Sewer AssnNatural background0.05 mg/LOct 2025200 served City of OrofinoNatural background0.05 mg/LFeb 20262,459 served OspreyHuman impact likely1.64 mg/LDec 2025100 served Overlook Mobile Home VillageNatural background0.30 mg/LJan 2026120 served Owyhee Village Subd Water Assn IncHuman impact likely1.30 mg/LJan 2026200 served

P

Panhandle Mobile EstatesNatural background0.72 mg/LSep 2025168 served Panhandle Mobile Home ParkNatural background0.74 mg/LSep 202550 served Panhandle Village Water SystemNatural background0.82 mg/LMay 2026103 served Panorama Hills Water CompanyHuman impact likely1.49 mg/LApr 2025175 served Par Estates Homeowners AssnHuman impact likely1.10 mg/LDec 2025140 served Paradise Estates Water CorpHuman impact clear4.20 mg/LDec 2025273 served Paradise Valley Water AssnNatural background0.05 mg/LJun 2025250 served City of ParisNatural background0.05 mg/LSep 2025535 served City of ParkerHuman impact clear4.58 mg/LOct 2025322 served Parkview Water AssnHuman impact likely1.64 mg/LDec 202590 served Parkwood Acres Water CompanyNatural background0.05 mg/LJun 202588 served City of ParmaNatural background0.05 mg/LSep 20252,250 served City of PaulNatural background0.30 mg/LAug 20251,195 served Paul Housing AuthorityNatural background0.30 mg/LDec 2025250 served City of PayetteHuman impact clear3.80 mg/LFeb 20248,127 served Peck Water SystemHuman impact clear4.05 mg/LApr 2025210 served Pelican Point SubdivisionNatural background0.30 mg/LJan 2026142 served Pepperwood Crossing/Rocky Mnt UtilitiesHuman impact likely1.74 mg/LSep 2025336 served Picabo Water SystemHuman impact likely1.81 mg/LFeb 202650 served Picket Corral Owners AssociationHuman impact likely2.90 mg/LNov 202535 served City of PierceNatural background0.05 mg/LApr 2026467 served Pine Haven ParkNatural background0.35 mg/LNov 202566 served Pine Hayden Subdpurchased waterHuman impact likely1.56 mg/LMay 202650 served Pine Ridge Water And Sewer Distpurchased waterNatural background0.05 mg/LDec 2025390 served Pine Villa Park And Water AssnNatural background0.22 mg/LNov 2025500 served Pinehurst Water DistNatural background0.14 mg/LFeb 20261,950 served Pineview Estates Water DistHealth-study range5.94 mg/LMar 2026450 served Pinewood EstatesHuman impact likely2.62 mg/LAug 2025450 served Pioneer AcresHuman impact likely2.94 mg/LDec 2025110 served Pioneer Mobile Home Park LlcNatural background0.05 mg/LDec 202553 served Pleasant Acres Mobile Home ParkHuman impact clear4.20 mg/LJan 202685 served Pleasant Acres Water And Sewer Distpurchased waterNatural background0.05 mg/LNov 202589 served Pleasant View ManorNatural background0.48 mg/LMay 2026100 served City of PlummerNatural background0.45 mg/LDec 20251,034 served City of PocatelloHuman impact clear4.57 mg/LFeb 202658,231 served Ponderosa Mobile Home ParkNatural background0.05 mg/LMar 202672 served City of Post FallsHuman impact likely1.31 mg/LJun 202620,285 served City of PotlatchNatural background0.05 mg/LJun 2026812 served Prairie Schooner EstatesHuman impact likely1.17 mg/LSep 2025115 served Prairie Water AssnHuman impact likely1.38 mg/LDec 202530 served City of PrestonNatural background0.05 mg/LMay 20265,591 served Preston Eastside Water CoNatural background0.05 mg/LJan 2026120 served Priest Lake Water, LlcNatural background0.12 mg/LMar 2026178 served City of Priest RiverNatural background0.05 mg/LMay 20262,173 served Purple Sage CommunityHealth-study range8.40 mg/LJan 202698 served

R

R And V Mobile Home ParkHuman impact clear3.00 mg/LNov 202527 served Ramsey EstatesNatural background0.96 mg/LNov 202588 served Ranch SubdHuman impact likely1.34 mg/LAug 202565 served Ranch Valley Water AssnNatural background0.46 mg/LMar 202645 served Rancho Via Well Users Assn IncHuman impact clear3.39 mg/LApr 202640 served Rapid River Water & Sewer DistNatural background0.46 mg/LAug 2025120 served City of RathdrumHuman impact likely1.70 mg/LMar 202610,358 served Red Pheasant Water Company LlcHuman impact clear4.06 mg/LJun 2026480 served Red Rock Water LlcHuman impact likely2.60 mg/LJan 202660 served Remington Rec Water DistNatural background0.26 mg/LMar 20251,104 served Rest Ez Rv ParkHuman impact likely1.46 mg/LMar 202625 served City of ReubensNatural background0.49 mg/LNov 202570 served City of RexburgHuman impact clear3.41 mg/LDec 202539,790 served Rich SubdHealth-study range6.60 mg/LMar 202660 served City of RichfieldHuman impact likely1.13 mg/LDec 2025501 served Ridge At Sun Up Bay Water SystemNatural background0.61 mg/LSep 202555 served City of RigbyNatural background0.05 mg/LJan 20265,400 served Rigby Air Village LlcNatural background0.05 mg/LJan 202680 served City of RigginsNatural background0.80 mg/LAug 2025434 served Riley Trailer ParkHuman impact clear4.30 mg/LApr 202630 served Rim Acres Mutual WaterHuman impact likely1.20 mg/LMar 202631 served Rimrock Service AreaHuman impact likely1.79 mg/LJun 20263,493 served Rio Vista Water Company 3Natural background0.30 mg/LDec 2025140 served City of RirieHuman impact likely1.36 mg/LMar 2026656 served River Meadowspurchased waterNatural background0.05 mg/LOct 202590 served River Terrace Mobile Home ParkNatural background0.11 mg/LDec 202590 served Riverbend EstatesHuman impact likely1.22 mg/LJun 202692 served Rivers Point Property Owners AssnNatural background0.05 mg/LJun 2025140 served Riverside EstatesNatural background0.05 mg/LMar 202690 served Riverside Trailer CourtHealth-study range7.67 mg/LJan 202635 served Riverside Water And Sewer DistrictNatural background0.05 mg/LJun 20252,000 served Riverstone SubdivisionNatural background0.05 mg/LNov 202550 served Riverview Acres 2Natural background0.05 mg/LOct 202529 served Riverview Acres Water Assn 1Natural background0.05 mg/LApr 202633 served Riverview VillaNatural background0.05 mg/LJun 2026200 served Rivervine SubdivisionNatural background0.05 mg/LDec 202525 served City of RobertsNatural background0.05 mg/LFeb 2026680 served Rock Ledge EstatesHealth-study range5.66 mg/LMar 2025150 served City of RocklandHuman impact likely2.30 mg/LFeb 2026242 served Rocky Beach Water DistNatural background0.15 mg/LNov 2025115 served Rogerson Water DistNatural background0.88 mg/LAug 202575 served Rolling Hills AcresNatural background0.05 mg/LSep 2025141 served Rolling Hills Estates Water CompanyNatural background0.05 mg/LJul 2025250 served Rolling Meadows RanchNatural background0.55 mg/LFeb 202646 served Rose Garden Mobile Home ParkNatural background0.05 mg/LJun 202684 served Rose Lake Water AssnNatural background0.05 mg/LMar 2026300 served Ross Point Water DistNatural background0.86 mg/LJul 20258,965 served Roswell Water Users Coop CompanyNatural background0.05 mg/LApr 202690 served Round Valley Water AssnHuman impact likely1.15 mg/LJun 2025125 served Royal Highland Water SystemNatural background0.54 mg/LJan 2026275 served City of RupertNatural background0.30 mg/LJul 20255,796 served Rustic Acres Mobile Home ParkNatural background0.05 mg/LNov 2025540 served

S

Sage Springs SubdivisionHuman impact likely1.37 mg/LFeb 202653 served Sagle Valley Water DistNatural background0.68 mg/LNov 2025708 served Saint Dominic SchoolHuman impact likely1.52 mg/LDec 2025228 served City of SalmonNatural background0.05 mg/LFeb 20253,158 served Salmon River Meadows Mutual Water CompanHuman impact likely1.16 mg/LAug 202547 served Sams Hollow Water CompanyNatural background0.05 mg/LSep 2025100 served Sandpoint Public Works DeptNatural background0.08 mg/LFeb 202612,284 served Santa Water And Sewer DistNatural background0.34 mg/LMar 2026160 served Savory Community LlcNatural background0.30 mg/LJun 2026100 served Sawtooth Estates Water UsersHealth-study range7.70 mg/LJan 2026175 served Scenic Mobile EstatesNatural background0.22 mg/LFeb 202685 served Scenic Properties Water Assn IncNatural background0.40 mg/LAug 202540 served Schweitzer Basin Water CompanyNatural background0.29 mg/LJun 2026955 served Scottys Mobile Home ParkHuman impact likely1.00 mg/LApr 202642 served Scriver Woods Homeowners AssnNatural background0.05 mg/LJun 2025150 served Seasons Road Water AssnNatural background0.22 mg/LDec 202550 served Sedero SubdHuman impact likely1.10 mg/LApr 202630 served Shady Rest Rv Park And CampgroundHuman impact likely1.86 mg/LMar 202680 served Shalimar SubdHuman impact likely2.00 mg/LApr 2026370 served Shamrock Villa Water AssnHuman impact clear4.00 mg/LOct 2025130 served City of ShelleyHuman impact likely2.58 mg/LJul 20254,409 served Shilo Ranch EstatesNatural background0.40 mg/LApr 202644 served Shipman Place SubdHuman impact clear4.50 mg/LApr 202640 served Shoshone Water WorksHuman impact likely1.37 mg/LJul 20251,398 served Shotgun Cherokee Subd 5Natural background0.05 mg/LNov 2025245 served Shotgun NorthNatural background0.05 mg/LNov 2025285 served Sienna Ridge EstatesNatural background0.25 mg/LSep 202581 served Sierra Water CorpHuman impact likely2.30 mg/LJun 202670 served Silver Leaf RanchNatural background0.18 mg/LFeb 202657 served Silver Sage Real Property Owners AssnHuman impact likely2.25 mg/LJul 202530 served Silver Spur SubdivisionHuman impact likely1.80 mg/LDec 202544 served Simplot Livestock Company GrandviewNatural background0.80 mg/LApr 2026100 served Singer Ranch Water SystemNatural background0.41 mg/LAug 202544 served Skin Creek Water AssnNatural background0.05 mg/LMar 2025200 served Sky Ranch EstatesNatural background0.05 mg/LJun 2025104 served Skyline Water AssnHuman impact likely2.90 mg/LApr 202650 served Sm UtilitiesNatural background0.12 mg/LNov 202558 served Smiley Creek Water Users Assn IncNatural background0.15 mg/LJun 2026117 served Smith Road Water Users AssnHuman impact likely1.83 mg/LMay 202658 served Snake River ResortNatural background0.05 mg/LJul 2025150 served Snake River View EstatesHuman impact likely2.76 mg/LJun 2026175 served City of Soda SpringsNatural background0.05 mg/LApr 20253,111 served Sohns Mobile Home Park IncHuman impact likely1.21 mg/LMay 202632 served Solar Acres Water Association, LlcNatural background0.07 mg/LSep 2025250 served Somerset West Water CorpNatural background0.05 mg/LNov 2025203 served Sourdough PointNatural background0.05 mg/LNov 2025178 served South Park Water And SewerHuman impact likely1.59 mg/LMay 2026125 served South River Water AssnNatural background0.75 mg/LApr 2026150 served Southfork Landing IncNatural background0.05 mg/LApr 202625 served Southshore WaterNatural background0.30 mg/LDec 202560 served Southside Water And Sewer DistHuman impact likely1.22 mg/LJan 2026615 served Southview Terrace ParkHuman impact likely1.61 mg/LAug 2025250 served Space Acres Water Users AssnHuman impact likely2.12 mg/LJun 202629 served Spirit Bend Water AssnNatural background0.28 mg/LMar 2026145 served City of Spirit LakeNatural background0.58 mg/LMar 20262,825 served Spirit Lake Industrial ParkNatural background0.05 mg/LMay 202690 served Splendid Acres Water AssnHealth-study range5.00 mg/LMar 202691 served Sportsmans River ResortHuman impact likely1.47 mg/LSep 202550 served Spring Creek TerracesNatural background0.30 mg/LMar 202670 served Springdale AcresNatural background0.30 mg/LFeb 202635 served City of SpringfieldNatural background0.05 mg/LDec 202535 served St AnthonyHuman impact likely1.21 mg/LAug 20253,606 served City of St CharlesNatural background0.05 mg/LMay 2026191 served City of St MariesNatural background0.05 mg/LNov 20254,173 served Stanley Pond IncNatural background0.50 mg/LFeb 202672 served Star Sewer And Water Dist Water SystemHuman impact likely1.50 mg/LAug 202514,000 served Starweather EstatesNatural background0.30 mg/LJan 2026150 served Stecher Mutual Water CompanyHuman impact clear3.00 mg/LJan 202662 served Stecher Water Users AssnNatural background0.20 mg/LJun 202670 served Stepping Stones EstatesHuman impact likely1.32 mg/LSep 202588 served City of StitesNatural background0.05 mg/LAug 2025253 served Stoneridge UtilitiesNatural background0.32 mg/LSep 2025940 served Strawberry Mink Creek Water AssnNatural background0.05 mg/LNov 202575 served City of Sugar CityHuman impact likely1.57 mg/LJun 20252,395 served Summerwind Water UsersHuman impact likely2.70 mg/LDec 2025192 served Sun Aire EstatesHuman impact likely1.10 mg/LSep 202570 served Sun Valley Water And Sewer DistNatural background0.30 mg/LJun 20253,400 served Sunbeam WaterHuman impact clear4.10 mg/LJun 202560 served Sunbrook Estates Div # 2Natural background0.05 mg/LSep 2025144 served Sunlight TerraceHealth-study range6.30 mg/LJun 2026234 served Sunny AcresNatural background0.33 mg/LMar 2026100 served Sunnyridge 3 Water CorpHealth-study range5.80 mg/LMar 2026240 served Sunnyridge I SubdNatural background0.05 mg/LJun 202635 served Sunnyridge Property OwnersHealth-study range5.10 mg/LJun 202653 served Sunnyridge Subd 2Health-study range6.10 mg/LSep 202534 served Sunnyside ParkNatural background0.17 mg/LSep 202440 served Sunnyside Water AssnNatural background0.19 mg/LMar 2026125 served Sunrise Terrace Homeowners AssnNatural background0.08 mg/LMar 202655 served Sunset Heights Water DistrictNatural background0.30 mg/LJun 202665 served Sunset Mobile Home ParkHuman impact likely1.41 mg/LApr 202655 served Sunset SubdHuman impact likely1.03 mg/LDec 202543 served Sunset Trailer RanchHuman impact clear3.50 mg/LNov 2025150 served Suntree Hollow Mobile Home CourtNatural background0.30 mg/LJan 202560 served Swan Lake Culinary Water CompanyHuman impact likely1.70 mg/LApr 202629 served Swan Shores IiNatural background0.05 mg/LMar 2026140 served Syringa Heights Water Distpurchased waterNatural background0.08 mg/LFeb 2026550 served Syringa Park SubdHuman impact clear3.28 mg/LNov 202535 served Syringa Water And SewerNatural background0.09 mg/LApr 2026203 served

T

Tamarack Estates Water AssnNatural background0.07 mg/LMar 202669 served Taylor Mountain Water And Sewer DistrictHuman impact clear3.82 mg/LSep 2025600 served City of TensedNatural background0.05 mg/LJun 2026146 served Terrace Lakes Water CompanyNatural background0.05 mg/LApr 2026475 served Terrace Water Corp IncHuman impact likely1.40 mg/LNov 202584 served City of TetonHuman impact likely1.83 mg/LOct 2025735 served Teton Reserve Subdivision & Golf CourseNatural background0.05 mg/LOct 202562 served Teton Springs Water And Sewer CompanyNatural background0.05 mg/LMay 2025924 served City of TetoniaNatural background0.05 mg/LMar 2026409 served The Centre At Rainey CreekNatural background0.36 mg/LDec 2025129 served The Valley ClubNatural background0.30 mg/LJan 2026115 served Third Addition Water AssnNatural background0.14 mg/LFeb 202697 served Three Mile Water DistNatural background0.17 mg/LDec 20252,458 served Thunder Canyon Estates Homeowners AssocNatural background0.05 mg/LJun 202635 served Timberstone HoaNatural background0.05 mg/LJan 2026170 served Town And Country Mobile Home ParkNatural background0.05 mg/LDec 202385 served Town And Country Water Users AssnHealth-study range6.25 mg/LFeb 202686 served Township Park Water CompanyHuman impact likely2.63 mg/LFeb 202543 served Trails End EstatesHuman impact likely2.76 mg/LDec 202549 served Travel America Trailer Park Sandpointpurchased waterNatural background0.68 mg/LNov 2025318 served Trinity Estates Water Users AssnHealth-study range8.10 mg/LFeb 2026250 served Trout Creek Culinary Water IncNatural background0.05 mg/LJun 202690 served Trow Creek Water AssnNatural background0.11 mg/LMar 202698 served City of TroyHuman impact clear3.81 mg/LDec 2025850 served Troy Hoffman Water CorpNatural background0.58 mg/LJun 2026367 served Twenty Mile Creek Water AssnNatural background0.05 mg/LOct 2025225 served Twin Bridges SubdHuman impact clear3.50 mg/LDec 202528 served City of Twin FallsHuman impact likely2.29 mg/LFeb 202656,121 served Twin Lakes Service AreaNatural background0.37 mg/LMar 20262,023 served Twin Pines Mobile ParkHuman impact likely2.02 mg/LJun 202686 served Tyhee And S And N Estates Water AssnHuman impact likely1.01 mg/LJun 2026300 served

U

City of UconHuman impact likely2.13 mg/LDec 20251,161 served Unit 3 Water AssnHuman impact likely2.22 mg/LOct 2025350 served University of IdahoNatural background0.05 mg/LJan 20268,589 served Upper Twin Lakes Water Company IncNatural background0.17 mg/LSep 2025227 served

V

Valley Co Op Water AssnNatural background0.05 mg/LFeb 202652 served Valley GreenHuman impact likely1.41 mg/LMar 2026135 served Valley Hi EstatesNatural background0.05 mg/LMar 2026140 served Valley View EstatesHuman impact likely1.16 mg/LApr 202674 served Valley View HeightsNatural background0.05 mg/LJun 202565 served Valley View WaterHealth-study range7.26 mg/LJan 202657 served Valley View Water And Sewer DistrictHuman impact likely1.46 mg/LMar 202670 served Valley View Water AssnHuman impact likely2.48 mg/LSep 202535 served Valley Vista EstatesNatural background0.05 mg/LOct 2025192 served Vanal Heights Sweet WaterNatural background0.40 mg/LDec 202545 served Vanal Heights Well AssnNatural background0.05 mg/LJan 202648 served Veolia Water IdahoNatural background0.10 mg/LJun 2026264,978 served Verde Hills Water Users Assn IncHuman impact likely1.80 mg/LFeb 202695 served City of VictorNatural background0.05 mg/LAug 20252,361 served View Point SubdivisionNatural background0.05 mg/LSep 202556 served View Water Development CompanyHuman impact likely1.00 mg/LOct 2025112 served Village 21 Water DistHuman impact likely1.24 mg/LJun 202625 served Viola Water And Sewer DistNatural background0.59 mg/LJun 2026128 served Vp, IncNatural background0.37 mg/LMar 2026327 served

W

Waha Glen Water DistNatural background0.11 mg/LNov 2025100 served Walking Horse Ranch EstatesNatural background0.15 mg/LFeb 202695 served Waterford EstatesHuman impact likely2.77 mg/LAug 2025108 served Wayside EstatesNatural background0.30 mg/LFeb 202650 served City of WeippeNatural background0.05 mg/LNov 2025438 served Weir Gulch Water Assnpurchased waterNatural background0.14 mg/LFeb 202680 served City of WeiserHealth-study range5.40 mg/LMay 20265,630 served Wells Bench Water And RoadNatural background0.05 mg/LJun 202528 served City of WendellHuman impact likely2.40 mg/LMay 20263,000 served West Bonner Water Dist 1Human impact likely1.30 mg/LMay 2026545 served West Meadows EstatesHuman impact likely1.10 mg/LAug 2025270 served West RiverNatural background0.05 mg/LMar 202665 served West Seasons Acres HoaNatural background0.30 mg/LJun 202631 served City of WestonNatural background0.05 mg/LMay 2026490 served Westview Shervik SubdHuman impact clear3.40 mg/LFeb 202678 served Westwood Water AssnHuman impact likely1.75 mg/LApr 202641 served Whiskey Creek Water UsersHuman impact likely2.28 mg/LMay 202635 served City of White BirdNatural background0.05 mg/LApr 2025125 served Whitewater SubdAbove the federal limit10.74 mg/LApr 2026106 served Whitney Nashville Water WorksHuman impact likely1.98 mg/LAug 2025403 served Wild Meadows I SubdNatural background0.80 mg/LDec 202527 served City of WilderNatural background0.05 mg/LMay 20251,690 served Wilderness Ranch Owners Association IncHuman impact likely1.28 mg/LApr 2026525 served Wildhorse Ridge SubdHuman impact likely2.78 mg/LDec 202585 served Wildrose EstatesNatural background0.05 mg/LOct 202540 served Willowbrook Estates Property OwnersHuman impact likely1.10 mg/LNov 2025100 served Willowtree Estates Homeowner AssociationNatural background0.05 mg/LFeb 202650 served Winchester Water DeptHuman impact clear3.17 mg/LJan 2026400 served Winder Water SystemHealth-study range6.03 mg/LMay 202620 served Woodenhills Water WorksNatural background0.30 mg/LNov 202562 served Woodland Heights MhpNatural background0.05 mg/LSep 202560 served Woodland Heights Water Assn #1Human impact likely2.33 mg/LApr 202654 served Woodland Shores Water And Sewer AssnNatural background0.11 mg/LDec 2025210 served Woodview Acres Property OwnersHuman impact clear3.10 mg/LJun 2026245 served WoodvilleHuman impact likely1.18 mg/LNov 2025225 served City of WorleyNatural background0.45 mg/LNov 2025591 served Wymosa Water Assn IncHuman impact likely2.10 mg/LNov 2025280 served

Y

Y Mobile Home ParkNatural background0.05 mg/LJan 202652 served Yellow Pine Water Users IncNatural background0.05 mg/LJan 202672 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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