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Arizona system directory

Find a community water system

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

742

systems with a current result

7,094,412

people served by them

26

systems carrying a supplier result

93

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 742 of 742 systems

0-9

67 Ave Property Owners AssociationHuman impact likely2.20 mg/LJan 202640 served 88 Shades Rv ParkHuman impact clear3.11 mg/LAug 2025488 served

A

A Petersen Water CompanyNatural background0.97 mg/LMar 2026160 served A1 Ranch DwidNatural background0.23 mg/LMar 202645 served Abra Water CompanyHuman impact likely2.00 mg/LJun 20261,932 served Acme Water - Blue HillsHealth-study range8.00 mg/LOct 2025138 served Acme Water - Yavapai EstatesHuman impact likely2.00 mg/LJul 2025243 served Acme Water -Dells WaterHuman impact clear4.70 mg/LMay 2026163 served Adaman Mutual Water CompanyHealth-study range6.66 mg/LJun 2026700 served Adjc Adobe Mountain SchoolHealth-study range5.38 mg/LApr 2026680 served Adoc Aspc Fort GrantNatural background0.46 mg/LMay 2025800 served Adoc Eyman UnitHuman impact likely1.70 mg/LJan 20263,969 served Adoc Florence AspHuman impact likely2.20 mg/LJan 20261,001 served Adoc TucsonNatural background0.33 mg/LJan 20264,500 served Adot Airport Grand CanyonNatural background0.25 mg/LNov 20251,140 served Aguila Water ServiceHuman impact likely2.90 mg/LJan 2026987 served Ajo Dwidpurchased waterHuman impact clear3.60 mg/LJul 2025405 served Ajo Improvement CompanyHuman impact clear3.60 mg/LJul 20252,654 served Alpine DwidNatural background0.26 mg/LJul 20251,030 served American Indian Christian MissionNatural background0.87 mg/LJul 202537 served American Ranch DwidHuman impact likely1.30 mg/LMay 2026140 served American Realty Mortgage Companypurchased waterHuman impact clear3.91 mg/LApr 202660 served Antelope Peak DwidHealth-study range5.68 mg/LApr 2026150 served Antelope Water CompanyNatural background0.31 mg/LApr 2026163 served Anway Manville Water CompanyHuman impact clear3.80 mg/LJan 2026576 served Apache Acres MhpHuman impact likely1.70 mg/LFeb 2026150 served Apache Junction Water DistrictNatural background0.12 mg/LJan 202615,610 served Apache Lake Marina ResortNatural background0.19 mg/LFeb 2026123 served Apache Mobile Home And Rv Park, LlcHuman impact likely1.00 mg/LFeb 2026130 served Appaloosa Water CompanyHuman impact likely2.00 mg/LJul 2025600 served Aravaipa Water CompanyNatural background0.25 mg/LMar 202660 served Arcosanti CampHuman impact likely1.90 mg/LJan 2026115 served Arivaca Townsite Water CoopHuman impact likely1.30 mg/LJan 2026150 served Arizona Training ProgramHealth-study range7.50 mg/LApr 2026470 served Arizona Water Co - Ajopurchased waterHuman impact clear3.60 mg/LJul 20252,100 served Arizona Water Co - Apache JunctionHuman impact likely1.48 mg/LJan 202662,055 served Arizona Water Co - BisbeeHuman impact likely1.40 mg/LJan 20268,707 served Arizona Water Co - LakesideNatural background0.12 mg/LFeb 202612,191 served Arizona Water Co - Miami ClaypoolHuman impact clear3.50 mg/LMay 20268,656 served Arizona Water Co - OracleHuman impact likely2.83 mg/LSep 202510,585 served Arizona Water Co - OvergaardNatural background0.29 mg/LJan 202613,797 served Arizona Water Co - Pinal ValleyHealth-study range9.00 mg/LApr 2026134,432 served Arizona Water Co - Pinetop LakesNatural background0.15 mg/LMar 20263,513 served Arizona Water Co - PinewoodHuman impact likely1.30 mg/LMar 20268,089 served Arizona Water Co - RimrockNatural background0.12 mg/LJun 20263,423 served Arizona Water Co - San ManuelNatural background0.35 mg/LMar 20264,748 served Arizona Water Co - SedonaHuman impact likely2.08 mg/LJun 202612,104 served Arizona Water Co - Sierra VistaHuman impact clear3.10 mg/LJan 20269,175 served Arizona Water Co - StanfieldHealth-study range6.27 mg/LApr 2026639 served Arizona Water Co - SuperiorHuman impact likely1.40 mg/LJan 20264,393 served Arizona Water Co - Tierra GrandeHuman impact clear4.00 mg/LJan 20261,796 served Arizona Water Co - White TanksHuman impact likely1.77 mg/LJun 202618,858 served Arizona Water Co - WinkelmanNatural background0.03 mg/LMar 2026424 served Arizonian Rv ResortHuman impact likely1.90 mg/LJan 2026225 served Arroyo Water CompanyNatural background0.74 mg/LMay 2026150 served Ash Creek Water CompanyNatural background0.03 mg/LJun 2025310 served Ash Fork Water ServiceHuman impact clear3.20 mg/LFeb 20262,250 served Ashley Rose MhpHuman impact clear3.10 mg/LJul 202550 served Aspc ApacheNatural background0.03 mg/LJul 2025540 served Aspc Lewis Complex Water SystemNatural background0.33 mg/LJan 20264,300 served Aspc YumaNatural background0.07 mg/LApr 20264,197 served Avalon Gardens Water SystemHuman impact likely1.40 mg/LFeb 2026100 served City of AvondaleHuman impact clear4.96 mg/LJul 202683,001 served Avra Water Coop IncHuman impact likely1.80 mg/LJan 20266,685 served Awc - Casa Grande South Water Companypurchased waterHealth-study range9.00 mg/LApr 2026176 served Awc - Casa Grande West Water CompanyHealth-study range6.20 mg/LJan 2026943 served Awc - Valley VistaNatural background0.61 mg/LMar 20261,776 served Az State Prison - Geo Group - KingmanHuman impact clear3.00 mg/LMar 20263,500 served

B

Baca Float Water CompanyNatural background0.53 mg/LFeb 20261,090 served Beardsley Water Company 1Human impact likely1.10 mg/LMar 202610,263 served Beardsley Water Company 3Natural background0.72 mg/LJan 202696 served BearizonaNatural background0.21 mg/LMay 20261,423 served Beaver Creek StoreHuman impact likely1.50 mg/LFeb 2025100 served Beaver Dam East DwidHuman impact likely1.30 mg/LMar 202647 served Beaver Dam Filling StationNatural background0.95 mg/LMar 202635 served Beaver Dam Wc System 1Natural background0.88 mg/LMar 20261,048 served Beaver Dam Wc System 2Natural background0.47 mg/LMar 2026162 served Beaver Dam Wc System 3Human impact clear3.50 mg/LFeb 202575 served Beaver Valley Water CompanyNatural background0.33 mg/LOct 2025150 served Bella Capri MhpHuman impact clear4.60 mg/LApr 2026342 served Bella Vista City Water SystemNatural background0.68 mg/LMay 202620,045 served Bella Vista Water SouthHuman impact likely2.70 mg/LMay 20262,178 served Belmont Mountain DairyHuman impact clear3.99 mg/LMay 202672 served Benson, City of Water SystemNatural background0.93 mg/LJan 20265,355 served Bent River Apt Enchantment ResortNatural background0.50 mg/LMar 202650 served Bermuda Water Company IncHuman impact clear3.60 mg/LJun 202625,000 served Berneil Water CompanyHuman impact clear4.30 mg/LApr 20261,388 served Beverly Gardens Trailer ParkHuman impact clear4.70 mg/LMay 2026120 served Biasi Water CompanyNatural background0.93 mg/LMar 2026284 served Bidegain Water CompanyHuman impact clear4.70 mg/LMar 202649 served Big Park Water CompanyHuman impact likely1.10 mg/LJun 20267,392 served Bisbee Douglas Intl AirportHuman impact likely1.60 mg/LJan 20262,600 served Black Canyon City WidHuman impact likely2.70 mg/LMay 20262,437 served Blue Ridge DwidNatural background0.28 mg/LMar 20261,920 served Bonita Creek Water CompanyHuman impact likely1.10 mg/LMar 202665 served Bouse DwidHuman impact clear3.40 mg/LJan 2026284 served Bowie WidNatural background0.23 mg/LJan 2026489 served Bradshaw Mountain View WaterHealth-study range6.30 mg/LFeb 20261,127 served Bradshaw Water Company IncHealth-study range5.09 mg/LApr 2026510 served Breezeway Trailer ParkHealth-study range5.80 mg/LApr 202638 served City of BuckeyeHuman impact clear3.50 mg/LJul 20257,008 served City of Buckeye - Valencia Town DivisionHealth-study range7.23 mg/LApr 202630,377 served Buckeye Acres MhpHealth-study range8.20 mg/LMay 202671 served City of Buckeye Sonora - SundanceHuman impact likely2.17 mg/LJan 202615,783 served City of Buckeye Tartesso Water SystemHuman impact likely1.36 mg/LMar 202610,123 served Buckskin Artists CommunityNatural background0.36 mg/LAug 2025320 served Bullhead City MohaveHuman impact clear4.90 mg/LJun 202636,330 served

C

C-Oasis ParkHuman impact likely1.79 mg/LApr 202654 served Caballeros Water CompanyHuman impact clear4.10 mg/LJan 2026100 served Cactus Country Rv ResortHuman impact likely1.10 mg/LApr 2026420 served Cameron Trading PostHuman impact likely1.20 mg/LJun 20261,270 served Cammies Foothills Vista MhcHuman impact likely2.40 mg/LApr 202662 served Camp MohaveNatural background0.06 mg/LMar 2026224 served Town of Camp Verde - Verde River EstatesHuman impact likely2.10 mg/LMay 2026145 served Town of Camp Verde UtilitiesNatural background0.25 mg/LJun 20265,013 served Campbell Estates MhpHealth-study range7.80 mg/LJul 2025450 served Canyon Vista EstatesNatural background0.27 mg/LJun 202675 served Canyon Water Improvement Districtpurchased waterHuman impact clear4.80 mg/LJul 2026130 served Carefree Water CompanyHealth-study range5.20 mg/LJan 20263,894 served Carolanne Drive HoaHuman impact likely1.50 mg/LJan 202672 served Casas Arroyo Association IncHuman impact clear3.00 mg/LApr 202627 served Casitas De CastilianHuman impact likely2.90 mg/LApr 2026167 served Catalina Country EstatesHuman impact likely1.20 mg/LJan 202677 served Catalina VillageHuman impact likely1.40 mg/LJul 2025107 served Cathedral Rock Estates Water CoopNatural background0.60 mg/LMay 202619 served Cathedral Vista Water CompanyNatural background0.88 mg/LMar 2026196 served Cave Creek WaterNatural background0.26 mg/LJan 20265,895 served Cca - Eloy ComplexHealth-study range8.40 mg/LApr 20268,852 served Cedar Grove Water CompanyNatural background0.38 mg/LMay 20261,564 served Centennial Park DwidNatural background0.03 mg/LMar 20261,578 served City of ChandlerNatural background0.25 mg/LJun 2026247,328 served Chandler Heights Citrus Irrigation DistHuman impact likely1.90 mg/LJan 20262,620 served Chaparral Water CompanyHuman impact likely1.00 mg/LApr 2026963 served Chief Sleep Easy TpHuman impact likely1.20 mg/LFeb 2025124 served Chimney EstatesHuman impact likely2.29 mg/LApr 202690 served Chino Meadows IiHuman impact likely2.00 mg/LJun 20262,350 served Town of Chino ValleyHuman impact likely2.40 mg/LOct 20252,742 served Chino Valley ParkHuman impact clear3.70 mg/LMay 202565 served Chloride Dwidpurchased waterHuman impact clear3.00 mg/LMar 2026350 served Cibola Water Improvement DistrictNatural background0.29 mg/LJan 2026197 served Cienega Water Company IncNatural background0.74 mg/LJan 2026108 served Circle City - City of SurpriseHuman impact likely1.51 mg/LApr 2026815 served Clarkdale Municipal Water SystemNatural background0.46 mg/LMar 20264,920 served Clay Springs DwidNatural background0.29 mg/LFeb 2025425 served Clear Creek Mobile HomeNatural background0.15 mg/LMay 202625 served Clear Springs Utility MainNatural background0.38 mg/LJan 20261,385 served Clear Springs Utility Well 6Natural background0.34 mg/LJan 202648 served Clearwater Utility Company IncHealth-study range6.64 mg/LApr 20262,175 served Cloud Nine Water CompanyNatural background0.38 mg/LJan 2026143 served Cochise College Park Water AssocHuman impact clear4.70 mg/LJan 202683 served Coldwater Canyon 1Natural background0.36 mg/LMay 2026541 served Coldwater Canyon 2Human impact likely2.20 mg/LJan 2026247 served Coldwater Canyon 3Human impact likely2.60 mg/LJan 2026120 served Community Wc of Green ValleyHuman impact likely2.40 mg/LFeb 202622,085 served Congress DwidHuman impact clear4.78 mg/LApr 20261,870 served Copper Mountain Ranch CfdHealth-study range5.98 mg/LApr 20261,071 served Cordes Junction Motel Rv ParkHuman impact likely1.22 mg/LJun 2026250 served Cordes Lakes Water CompanyHuman impact clear3.60 mg/LJan 20264,257 served Coronado Forest Drive Water CoopHuman impact likely1.00 mg/LJan 202630 served Cottonwood Municipal Water Cw1Natural background0.66 mg/LFeb 202611,023 served Cottonwood Municipal Water Vsf1Natural background0.24 mg/LFeb 20262,194 served Cottonwood Municipal Water Vv 1Human impact likely1.80 mg/LFeb 2026785 served Cottonwood Municipal Water Vv2Human impact likely1.70 mg/LFeb 20262,893 served Cottonwood Municipal Water Vv3Natural background0.42 mg/LFeb 20261,458 served Cottonwood Municipal Water Vv6Natural background0.96 mg/LFeb 20264,509 served Country Club Acres Water IncHuman impact likely2.80 mg/LJul 2025431 served Country Home MhpHuman impact likely2.37 mg/LMay 2026300 served Crescent Manor MhpHuman impact clear3.28 mg/LMay 2026200 served Cross Creek RanchNatural background0.73 mg/LMay 202655 served Crossroads Park MhpHuman impact likely1.30 mg/LJan 2026100 served Crossroads Rv ParkHuman impact clear4.90 mg/LFeb 2026272 served Crown King Water CompanyNatural background0.03 mg/LNov 2025203 served Cs Carter Water CompanyAbove the federal limit33.00 mg/LApr 202628 served Cs Christopher Creek HavenNatural background0.53 mg/LMar 2026497 served Cs Citrus Park Water CompanyNatural background0.39 mg/LFeb 2026102 served Cs El Prado Water CompanyNatural background0.03 mg/LFeb 2026404 served Cs Flagstaff Ranch Water CompanyNatural background0.21 mg/LMar 2026350 served Cs Gadsden Water CompanyHealth-study range8.10 mg/LApr 2026540 served Cs Gardner Water CompanyNatural background0.93 mg/LMar 2026266 served Cs Green Acres Water CompanyNatural background0.03 mg/LFeb 2026105 served Cs Harrisburg Utility CompanyHuman impact clear3.30 mg/LJan 20261,759 served Cs High Country Pines Water CompanyNatural background0.21 mg/LJun 2025668 served Cs Holiday Water CompanyNatural background0.74 mg/LJan 2026395 served Cs Lake Verde Water CompanyNatural background0.78 mg/LMay 2026169 served Cs Loma Linda Water CompanyHuman impact likely1.40 mg/LFeb 2026351 served Cs Los Cerros Water Company IncHuman impact likely1.20 mg/LJan 20262,613 served Cs Mohawk Utility CompanyNatural background0.40 mg/LFeb 2026243 served Cs Mormon Lake Water CompanyNatural background0.12 mg/LMay 2026353 served Cs Oak Creek Public Service LlcNatural background0.28 mg/LMar 2026650 served Cs Peeples Valley Water CompanyHuman impact likely1.70 mg/LFeb 2026658 served Cs Q Mountain Water CompanyHuman impact likely2.00 mg/LJan 20261,224 served Cs Rancheros Bonitos Water CompanyHealth-study range8.10 mg/LApr 2026120 served Cs Santa Cruz Water CoHuman impact clear3.10 mg/LApr 202682 served Cs Sunizona Water CompanyHuman impact likely1.30 mg/LJan 2026136 served Cs Tierra Mesa Estates Water CompanyHealth-study range7.30 mg/LApr 2026632 served Cs Tonto Village Water CompanyNatural background0.20 mg/LMar 2026512 served Cs Verde Lee Water CompanyHuman impact likely1.70 mg/LFeb 2026604 served Cs West Village Water CompanyNatural background0.18 mg/LMar 2026210 served Cs White Hills Water Company Unit 1Human impact clear4.40 mg/LMar 2026338 served Cs White Hills Water Company Units 3 4 6Health-study range5.60 mg/LMar 2026333 served Cs Winchester Water CompanyHuman impact likely1.30 mg/LJan 2026402 served Cup of Gold Water CompanyNatural background0.14 mg/LMay 202642 served

D

Dateland Public Service CoHuman impact likely1.50 mg/LFeb 2026319 served Davis Ranch Land OwnersHuman impact likely2.60 mg/LJan 202640 served Desert FoothillsHuman impact clear3.80 mg/LJun 20263,091 served Desert Gardens Rv Resort Co-Op, IncHuman impact likely2.10 mg/LJan 2026532 served Desert Hills WaterHuman impact likely2.50 mg/LApr 20264,220 served Desert OasisHuman impact likely1.54 mg/LApr 202623,963 served Desert Paradise Mhp LlcHuman impact likely2.90 mg/LJan 202690 served Desert Shores Rv MhpHealth-study range6.90 mg/LJul 2025220 served Desert Sky DwidNatural background0.93 mg/LSep 202570 served Desert Water CoopHuman impact likely1.70 mg/LJan 2026150 served Desert Winds Mobile ParkNatural background0.21 mg/LJan 202634 served Diamond Grove Mobile Home EstatesHealth-study range7.62 mg/LMay 2026385 served Diamond Valley Water Districtpurchased waterNatural background0.71 mg/LMay 20262,000 served Doney Park WaterHuman impact clear3.20 mg/LJun 20268,996 served Double R Water Distributors, Inc.Human impact likely2.40 mg/LJun 202698 served City of DouglasHuman impact likely2.87 mg/LJun 202616,656 served Dragoon Water CompanyHuman impact likely1.20 mg/LJul 2025283 served Ds Water CompanyHuman impact likely1.20 mg/LFeb 2025258 served Town of DuncanHuman impact likely2.20 mg/LOct 2025605 served

E

Town of EagarNatural background0.53 mg/LMay 20264,590 served East Slope Water - WestNatural background0.55 mg/LJan 2026655 served East Slope Water CompanyNatural background0.55 mg/LMay 20261,980 served Eden Water Company Incpurchased waterNatural background0.03 mg/LJun 2025400 served Ehrenberg Improvement DistrictNatural background0.28 mg/LJan 2026989 served City of El MirageHuman impact likely2.38 mg/LJun 202639,884 served Elfrida WidHuman impact likely1.10 mg/LMay 2026800 served City of EloyHealth-study range7.90 mg/LApr 20267,903 served Empirita Water CompanyHuman impact likely1.80 mg/LJan 2026120 served Epcor - Agua FriaNatural background0.30 mg/LMay 2026127,718 served Epcor - AnthemHuman impact clear4.28 mg/LFeb 202623,826 served Epcor - Chaparral CityHuman impact clear3.05 mg/LJan 202626,026 served Epcor - Holiday HarborNatural background0.32 mg/LJan 2026559 served Epcor - Lake HavasuHuman impact likely1.80 mg/LFeb 20264,788 served Epcor - LakesideNatural background0.29 mg/LJan 20261,775 served Epcor - Marina VillageNatural background0.31 mg/LJan 2026528 served Epcor - Moovalya KeysNatural background0.34 mg/LJan 20261,298 served Epcor - North East Agua FriaHuman impact likely1.22 mg/LMay 202614,723 served Epcor - Paradise Valley/ScottsdaleHealth-study range6.28 mg/LJul 202614,107 served Epcor - Parker DamNatural background0.32 mg/LJan 2026429 served Epcor - Rio LindoNatural background0.33 mg/LJan 202679 served Epcor - San TanHealth-study range8.70 mg/LMay 202687,435 served Epcor - San Tan AnthemHealth-study range5.54 mg/LMar 202610,362 served Epcor - Sun CityHuman impact clear3.28 mg/LApr 202638,016 served Epcor - Sun City WestHuman impact clear3.06 mg/LMay 202625,796 served Epcor - Tierra Del RioNatural background0.58 mg/LJan 20264,868 served Epcor - TubacHuman impact likely1.20 mg/LFeb 20262,076 served Epcor - Willow Valley/King StreetNatural background0.03 mg/LFeb 20263,408 served Epcor - Willow Valley/Lake CimarronNatural background0.03 mg/LFeb 2026596 served Epcor- Rio VerdeNatural background0.60 mg/LJan 20265,330 served Escapees At North RanchNatural background0.83 mg/LJul 2025500 served Ez Livin Rv ParkNatural background0.91 mg/LMar 202640 served

F

Far Horizons East MhpHuman impact likely2.90 mg/LFeb 2026870 served Far Horizons MhpHuman impact clear3.60 mg/LOct 2025258 served Federal Correction InstitutionHuman impact likely2.60 mg/LJan 20261,500 served Federal Correctional InstNatural background0.35 mg/LJan 2026350 served Festival RanchHuman impact likely2.53 mg/LJan 202610,313 served Fishers Landing ResortNatural background0.99 mg/LJun 2026402 served City of FlagstaffNatural background0.56 mg/LJun 202676,960 served Florence Water CompanyHealth-study range5.20 mg/LApr 202615,900 served Flowing Wells Irrigation DistrictHuman impact clear3.46 mg/LJan 202616,000 served Foothills Utilities Kingman EastHuman impact likely2.20 mg/LFeb 20262,538 served Foothills Utilities Kingman WestHuman impact likely1.90 mg/LFeb 2026653 served Foothills Water And Sewer LlcHuman impact clear3.50 mg/LMar 202632,425 served Forest Highlands Water CompanyNatural background0.18 mg/LMay 20261,668 served Forest Lakes Water Improvement DistrictNatural background0.14 mg/LMar 20261,746 served Town of FredoniaNatural background0.60 mg/LMar 20251,327 served Freeport Mcmoran Bagdad TownHuman impact likely1.20 mg/LJul 20253,200 served

G

G & L Mobile ParkNatural background0.32 mg/LJun 202690 served G Lazy B Mobile Home ParkHuman impact likely2.20 mg/LJan 202625 served Garigans Gulch Water CoopNatural background0.57 mg/LJan 202635 served Gator Water CompanyHuman impact likely1.60 mg/LFeb 202629 served Geronimo EstatesNatural background0.57 mg/LMay 2026212 served Ghr Landowners Assn Water CoopHuman impact clear4.10 mg/LJul 2025280 served Town of Gila BendHuman impact likely2.00 mg/LJan 20261,922 served Town of GilbertHealth-study range7.60 mg/LMay 2026247,600 served Gilbert Rigg Well CoopHealth-study range6.20 mg/LJan 202695 served GiselaNatural background0.33 mg/LMay 2026508 served Glen Canyon Nra WahweapNatural background0.50 mg/LMar 2026579 served City of GlendaleHuman impact clear3.11 mg/LMay 2026234,766 served City of GlobeHuman impact clear4.80 mg/LJul 20267,536 served Golden Shores Water CompanyHuman impact likely2.10 mg/LFeb 20263,970 served Golden Valley Improvement DistrictHuman impact likely2.70 mg/LNov 20253,950 served Goodman Water CompanyNatural background0.35 mg/LJan 20262,656 served Goodyear Water DepartmentHealth-study range9.36 mg/LApr 202650,001 served Graham County Utilities - PimaNatural background0.03 mg/LJun 20253,799 served Graham County Utilities-Fort ThomasNatural background0.70 mg/LJun 2025452 served Grand Canyon Junction HydroNatural background0.41 mg/LMar 2026430 served Grand Canyon National ParkNatural background0.19 mg/LJun 202616,590 served Grandview Water CompanyAbove the federal limit13.70 mg/LJun 202650 served Granite Dells Water CompanyHuman impact likely2.70 mg/LMay 202650 served Granite Mountain Water CompanyHuman impact likely2.30 mg/LMay 2026381 served Granite Oaks Water Users AssociationHuman impact likely1.50 mg/LMay 20261,200 served Green Valley DwidNatural background0.74 mg/LJan 20268,687 served Green Valley MhpNatural background0.03 mg/LMar 2026190 served Greenehaven Water CompanyNatural background0.50 mg/LMar 2026807 served Greenfield RanchettesHealth-study range6.40 mg/LJan 202653 served Groom Creek Water UsersHuman impact likely1.40 mg/LFeb 2026458 served Gw -Bwc, Inc- Buckeye RanchHuman impact likely2.20 mg/LJan 2026422 served Gw -Bwc, Inc- EagletailHuman impact clear3.60 mg/LJan 2026288 served Gw -Bwc, Inc- SunshineHuman impact clear3.30 mg/LApr 2026604 served Gw -Bwc, Inc.- NswcHuman impact likely1.10 mg/LJan 2026319 served Gw -Bwc, Inc.- Wpe #6Natural background0.91 mg/LApr 202669 served Gw Farmers Water Co - ContinentalHealth-study range6.20 mg/LJan 20265,592 served Gw Farmers Water Co - SahuaritaHealth-study range7.10 mg/LJan 2026492 served Gw Farmers Water Co - Sahuarita HighlandHuman impact likely2.70 mg/LJan 2026492 served Gw Farmers Water Co - Santa Rita SpringsHuman impact clear3.90 mg/LJan 20263,990 served Gw Ocotillo Water - CatalinaHuman impact likely1.60 mg/LJan 20261,168 served Gw Ocotillo Water - Diamond BellHuman impact likely1.50 mg/LJan 2026706 served Gw Ocotillo Water - Rancho Del Sol LindoHuman impact likely2.20 mg/LJan 20263,128 served Gw Ocotillo Water - Sierrita FoothillsHuman impact likely1.70 mg/LJan 202684 served Gw Ocotillo Water - Silverbell WestHuman impact likely1.90 mg/LJan 2026263 served Gw Ocotillo Water - ThunderheadHuman impact likely1.50 mg/LFeb 2026174 served Gw Ocotillo Water - Valley View AcresHuman impact likely1.60 mg/LJan 2026496 served Gw Saguaro Dist Water Co - Amber AnnHuman impact likely1.70 mg/LJan 2026108 served Gw Saguaro Dist Water Co - Las QuintasNatural background0.82 mg/LJan 20263,720 served Gw Saguaro Dist Water Co - Lyn LeeHealth-study range7.35 mg/LJan 2026114 served Gw Saguaro Dist Water Co - MirabellHuman impact likely1.80 mg/LJan 2026180 served Gw Saguaro Dist Water Co - RinconNatural background0.03 mg/LFeb 2026232 served Gw Saguaro Dist Water Co - Tala WayHuman impact likely1.70 mg/LJan 2026255 served Gw Saguaro Dist Water Co - TortolitaHuman impact clear3.90 mg/LJan 202669 served Gw Santa Cruz Water - Cp Water Copurchased waterHealth-study range9.00 mg/LApr 202637 served Gw Santa Cruz Water - Maricopa SwHuman impact clear4.60 mg/LJan 20261,170 served Gw Santa Cruz Water -Twin Hawks WaterHuman impact clear3.20 mg/LJan 202657 served Gw Santa Cruz Water CoHealth-study range7.19 mg/LApr 202684,000 served Gw Santa Cruz Water Co - Red RockHuman impact clear3.10 mg/LJan 20263,813 served Gw- Bwc, Inc- DixieHuman impact likely1.80 mg/LOct 2025132 served Gw- Bwc, Inc- Garden CityHuman impact clear3.20 mg/LJan 202651 served Gw- Bwc, Inc- RoseviewHealth-study range6.50 mg/LJan 202666 served

H

Hacienda Del Sol MhpHuman impact clear4.92 mg/LJun 2026300 served Halcyon Acres 2Human impact likely1.60 mg/LJan 2026164 served Halcyon Acres Water Users AssociationHuman impact likely2.40 mg/LJan 2026215 served Hardyville On The RiverNatural background0.03 mg/LFeb 202642 served Hatch Valley DwidHealth-study range5.90 mg/LNov 2025150 served Havasu Heights DwidHealth-study range5.30 mg/LFeb 2026617 served Heber DwidNatural background0.68 mg/LFeb 2026839 served Heber Dwid - Black Canyon SubdivisionNatural background0.29 mg/LFeb 2026103 served Heckethorn Water CompanyNatural background0.71 mg/LMar 202690 served Hidden Hollow MhcNatural background0.28 mg/LMar 2026400 served High Chaparral Water CoopHuman impact likely1.60 mg/LJan 202672 served Highland Pine Dwidpurchased waterHuman impact likely1.79 mg/LJan 2026450 served Hillcrest Water CompanyHealth-study range5.10 mg/LJun 2026454 served City of HolbrookNatural background0.06 mg/LFeb 20265,318 served Holbrook Sda Indian SchoolNatural background0.03 mg/LJun 2026100 served Holiday Hills DwidHuman impact likely1.77 mg/LDec 2024150 served Hopeville Water SystemHealth-study range7.58 mg/LMay 2026145 served Horizon Six Dwidpurchased waterHuman impact likely1.40 mg/LJan 2026560 served Howard Cantonment AreaNatural background0.06 mg/LMar 20261,500 served Town of Huachuca CityHuman impact likely1.10 mg/LJan 20261,750 served Humboldt Water SystemHealth-study range7.97 mg/LApr 2026825 served Hunter Water - Town of DuncanNatural background0.87 mg/LJun 2025125 served Hydro Resources-TusayanHuman impact likely1.10 mg/LMar 20261,710 served

I

Indian Hills EstatesHuman impact likely1.10 mg/LMar 202630 served Inscription Canyon Water CompanyHuman impact likely2.10 mg/LMay 2026566 served Inscription Canyon Water CompanyHuman impact likely2.00 mg/LMay 2026507 served

J

Jackson Acres DwidHuman impact likely1.10 mg/LFeb 202630 served Jacob Lake LodgeNatural background0.35 mg/LMay 202627 served Jakes Corner Water SystemNatural background0.50 mg/LMar 202635 served Town of JeromeNatural background0.26 mg/LMay 2026440 served Jones Coop Water AssocHuman impact likely2.92 mg/LMay 202635 served Joshua Valley Utility CompanyHuman impact clear3.60 mg/LNov 20251,500 served

K

Kachina Village DwidNatural background0.51 mg/LMar 20263,500 served Kahlua Well CoopHuman impact likely2.40 mg/LOct 202599 served Katherine Heightspurchased waterHuman impact likely1.60 mg/LFeb 2026415 served Katherine Landing DwtpNatural background0.34 mg/LJul 20251,300 served Katherine Resorts Water CompanyNatural background0.35 mg/LOct 202558 served Town of KearnyNatural background0.43 mg/LApr 20261,950 served Kingman Municipal WaterHealth-study range5.30 mg/LApr 202645,000 served Kino Ranch 2Natural background0.03 mg/LApr 2026109 served Klafter Well CoopNatural background0.75 mg/LJan 202645 served Krazy K Rv ParkNatural background0.25 mg/LApr 2026380 served

L

La Casita Water Company 1Natural background0.56 mg/LJan 2026174 served La Casita Water Company 2Natural background0.60 mg/LJan 2026261 served La Casita Water Company 3Health-study range6.01 mg/LMay 2026605 served La Cholla Airparkpurchased waterHuman impact likely1.40 mg/LJun 2026250 served La Costa Water Users AssocNatural background0.83 mg/LJun 202630 served Lago Del Oro Water CompanyHuman impact clear3.82 mg/LJan 202618,132 served Lagoon Estates Wc Unit 2Natural background0.03 mg/LMar 2026125 served Lagoon Estates Wc Unit 7Natural background0.03 mg/LMar 20261,578 served Laguna Mobile Home And Rv ParkNatural background0.30 mg/LMay 2026450 served City of Lake HavasuHuman impact likely1.40 mg/LJan 202654,610 served Lake Juniper County Improvement DistrictHealth-study range5.50 mg/LApr 202663 served Lake Mary Country StoreNatural background0.44 mg/LMar 2026130 served Lake Mohave HighlandsNatural background0.14 mg/LMar 2026746 served Lake Roosevelt Gardens EastNatural background0.53 mg/LMay 2026121 served Lakeside Water CompanyHuman impact likely1.90 mg/LMay 202655 served Lakewood Estates Water CompanyHealth-study range5.10 mg/LJan 2026722 served Lamplighter Rv ResortHealth-study range5.60 mg/LOct 2025308 served Lazy Acres MhpHealth-study range6.40 mg/LJul 202575 served Lazy C Water ServiceHuman impact clear3.45 mg/LMay 2026359 served Liberty Water LpscoHealth-study range7.34 mg/LJun 202655,810 served Liberty Water Rio RicoHuman impact clear4.85 mg/LApr 202617,960 served Little Park Water CompanyNatural background0.18 mg/LMay 2025264 served Livco Water CompanyNatural background0.36 mg/LJul 20251,120 served Living Springs Mhp - Rainbow Trout FarmNatural background0.13 mg/LMar 2026100 served Lockett EstatesNatural background0.32 mg/LMar 202630 served Lord Az Water 2 - Winchester TrailsNatural background0.03 mg/LMay 20261,304 served Los Arboles Mobile Home ParkHuman impact likely1.10 mg/LApr 2026303 served Lost Traveler Rv ParkNatural background0.34 mg/LJun 2026200 served

M

Majestic View Water Improvement DistrictHuman impact likely1.90 mg/LMar 202670 served Town of MammothNatural background0.50 mg/LMar 20261,181 served Manneken ApartmentsHuman impact likely1.09 mg/LJan 202634 served Marana Dwid - CulverHuman impact likely2.70 mg/LJan 2026709 served Marana Dwid - DerringerHuman impact likely2.70 mg/LApr 20261,950 served Marana Municipal - Airline LambertHuman impact clear3.10 mg/LApr 20264,568 served Marana Municipal - Hartman VistasHuman impact likely2.50 mg/LApr 20255,248 served Marana Municipal - MaranaHealth-study range5.53 mg/LApr 202615,162 served Marana Municipal - Palo VerdeHuman impact clear4.00 mg/LJan 2026118 served Marana Municipal - Picture RocksHuman impact likely1.80 mg/LJan 20265,278 served Marana Municipal - Silverbell Gatewaypurchased waterHealth-study range5.28 mg/LJun 2026750 served Marana Municipal - Tortolita Mountainpurchased waterHealth-study range5.28 mg/LJun 2026200 served Maricopa Consolidated DwidHealth-study range5.90 mg/LApr 2026928 served Maricopa Mountain Dwid 1Human impact clear3.91 mg/LApr 2026450 served Maricopa Mountain Dwid 2Health-study range6.10 mg/LJan 2026120 served Mayer DwidHuman impact likely1.20 mg/LMay 20261,400 served Mcneal Water CompanyNatural background0.91 mg/LJan 202666 served City of MesaHealth-study range5.35 mg/LJun 2026466,000 served Mesaland Water CompanyHuman impact likely1.60 mg/LJan 2026294 served Mescal Lakes Water SystemHuman impact likely1.20 mg/LJul 20251,390 served Metropolitan DwidHuman impact clear4.50 mg/LApr 202645,570 served Metropolitan Dwid - Diablo VillageHuman impact likely1.70 mg/LJan 20265,542 served Metropolitan Dwid - E&T SystemNatural background0.71 mg/LApr 2026880 served Metropolitan Dwid - HubHuman impact likely2.70 mg/LJan 20264,252 served Metropolitan Dwid - Lazy BNatural background0.83 mg/LJul 202577 served Michaels Ranch Water Users AssociationNatural background0.25 mg/LMay 202654 served Michigan Trailer ParkHuman impact likely1.10 mg/LOct 2025400 served Mingus Mountain AcademyNatural background0.95 mg/LAug 2025130 served Mingus West Water SystemNatural background0.73 mg/LFeb 2026602 served Mission Palms ApartmentsHuman impact clear3.70 mg/LJan 2026720 served Misty Mountain DwidNatural background0.39 mg/LMar 202644 served Mobile Gardens DwidNatural background0.76 mg/LJan 2026400 served Mobile Home PropertiesHuman impact likely2.70 mg/LFeb 2026114 served Monte Vista Water CompanyHuman impact likely2.20 mg/LJan 2026150 served Montezuma Heights WaterHuman impact likely1.30 mg/LMar 202660 served Montezuma Rimrock Water CompanyNatural background0.06 mg/LJul 2025439 served Morenci Water Elec Co CliftonNatural background0.06 mg/LJun 20251,678 served Morenci Water Elec Co MainNatural background0.03 mg/LOct 20254,108 served Morristown Water CompanyHuman impact likely2.20 mg/LJan 2026131 served Mountain Dell Water IncHuman impact clear4.20 mg/LMar 2026250 served Mountain Gate Estates MhpHuman impact clear3.30 mg/LOct 2025400 served Mountain Glen Water Servic Linden TrailsNatural background0.35 mg/LJun 2026975 served Mountain View MhpHuman impact likely2.30 mg/LJun 2026160 served Mountain View Mobile VillageNatural background0.31 mg/LJun 202675 served Mountain View Rv RanchHealth-study range5.10 mg/LJan 2026100 served Mountain Vu Rv CourtAbove the federal limit10.10 mg/LJul 202680 served Mt Lemmon DwidNatural background0.32 mg/LJun 2025290 served Mt Tipton Water CompanyHuman impact likely1.80 mg/LNov 20252,257 served

N

Naco EstatesHuman impact likely2.40 mg/LJan 202675 served Naco Water Co BisbeeHuman impact likely1.30 mg/LJan 2026138 served Naco Water Co MainHuman impact likely2.10 mg/LJan 2026658 served Navajo Water - Chaparral PinesNatural background0.57 mg/LFeb 2026198 served Navajo Water - Laguna EstatesNatural background0.27 mg/LFeb 202589 served Navajo Water - Summer PinesHuman impact likely1.00 mg/LFeb 2025580 served New Saddleback VistaHealth-study range9.57 mg/LApr 2026100 served City of NogalesHuman impact likely1.81 mg/LApr 202622,000 served North Bay EstatesNatural background0.45 mg/LMay 2026156 served North La Cholla MhpHealth-study range6.00 mg/LJan 2026150 served North Mohave ValleyHuman impact likely1.60 mg/LFeb 20265,190 served Northern Section 4 CoopHealth-study range7.40 mg/LNov 202448 served Northern Sunrise Wc CoronadoHuman impact likely1.40 mg/LMay 2026553 served Northern Sunrise Wc Mustang CrystalNatural background0.74 mg/LMay 2026315 served Ntm AviationNatural background0.91 mg/LJan 202647 served

O

Oak Creek Utility CorpNatural background0.14 mg/LMar 202672 served Oak Creek ValleyNatural background0.21 mg/LMay 2026450 served Oak Creek Water DistrictNatural background0.52 mg/LMar 20261,507 served Oatman Water CompanyNatural background0.68 mg/LJun 2026230 served Ojo Bonito Estates DwidNatural background0.21 mg/LMay 202654 served Old Concho Water Userspurchased waterNatural background0.36 mg/LJul 202540 served Olive Avenue HoaHealth-study range9.22 mg/LMay 202625 served On The GreensHuman impact clear3.60 mg/LMay 2026173 served Orangewood Mobile Home ParkHealth-study range9.06 mg/LMay 2026500 served Orchard Valley Mobile Home ParkHealth-study range6.60 mg/LOct 2025130 served Organ Pipe Nm HeadquartersHuman impact clear4.60 mg/LJul 2025755 served Oro Valley Water CountrysideNatural background0.63 mg/LJan 20264,534 served Oro Valley Water UtilityHuman impact likely1.40 mg/LJun 202642,316 served

P

City of PageNatural background0.37 mg/LMar 20267,420 served Painted Desert Demo Project Star SchoolNatural background0.45 mg/LMar 2026250 served Paloma RanchNatural background0.68 mg/LJan 2026112 served Palominas Water Sewer CoNatural background0.73 mg/LJan 202627 served Pantano Water CoopNatural background0.59 mg/LJan 2026156 served Papago Butte DwidAbove the federal limit32.40 mg/LApr 2026530 served Park Water Company IncHuman impact likely1.69 mg/LApr 2026416 served Patagonia Water DepartmentNatural background0.28 mg/LApr 2026819 served Patton Place EstatesNatural background0.78 mg/LJan 2026795 served Town of PaysonHealth-study range5.70 mg/LMay 202617,682 served Payson Water - Deer CreekNatural background0.24 mg/LMay 2026308 served Payson Water - East Verde EstatesHealth-study range8.51 mg/LJun 2026375 served Payson Water - Flowing SpringsNatural background0.99 mg/LOct 202586 served Payson Water - Meads RanchNatural background0.07 mg/LMay 2026172 served Payson Water - Mesa De CaballoHuman impact clear3.70 mg/LMay 2026976 served Payson Water - Whispering PinesNatural background0.18 mg/LMay 2026403 served Peak View RanchNatural background0.66 mg/LApr 2026508 served Peekaboo Water CoopHuman impact clear3.62 mg/LFeb 2026100 served City of PeoriaHealth-study range7.50 mg/LJun 2026187,676 served Philadelphia Water SystemNatural background0.03 mg/LNov 202542 served City of PhoenixNatural background0.80 mg/LJun 20261,695,000 served Picacho DwidHealth-study range6.00 mg/LJan 2026340 served Picacho Peak Rv ResortHuman impact likely2.97 mg/LJun 2026400 served Picacho Peak Water CompanyHealth-study range5.26 mg/LJun 202655 served Picacho Water CompanyHealth-study range6.80 mg/LJan 20262,440 served Pico Vista Community WellHuman impact likely1.50 mg/LJan 202649 served Pima UtilitiesHuman impact clear3.96 mg/LMar 202620,000 served Pinal County Justice Complexpurchased waterHealth-study range5.20 mg/LApr 2026820 served Pine Creek Canyon DwidNatural background0.66 mg/LMar 2026173 served Pine Strawberry WidHuman impact clear3.70 mg/LMay 20268,013 served Pine Valley Water CompanyNatural background0.23 mg/LMar 2026400 served Pine View Rv ParkHuman impact clear3.70 mg/LMay 2026138 served Pine Water Association DwidNatural background0.03 mg/LMay 2026100 served Pinecrest Water CompanyNatural background0.09 mg/LFeb 202584 served Pinedale DwidNatural background0.34 mg/LFeb 2026376 served Pinedale Estates DwidNatural background0.03 mg/LMay 2026208 served Pinehurst Water CompanyNatural background0.15 mg/LOct 202554 served Pinetop Water Community Facilities DistNatural background0.13 mg/LMay 20263,250 served Pioneer Rv ResortHuman impact clear3.84 mg/LFeb 2026583 served Pita Water CompanyHuman impact likely2.90 mg/LJan 202654 served Pocketknife Water CoopNatural background0.75 mg/LJan 202665 served Pomerene DwidNatural background0.49 mg/LMay 20261,030 served Ponderosa DwidNatural background0.19 mg/LMay 20265,375 served Ponderosa Park DwidNatural background0.03 mg/LFeb 2025602 served Ponderosa Utility CorpNatural background0.50 mg/LMar 20261,585 served Ponderosa Water, L.L.CNatural background0.23 mg/LMar 2026117 served Porter Creek DwidNatural background0.81 mg/LMar 2026250 served Porter Mountain DwidNatural background0.03 mg/LMar 2026322 served City of PrescottHuman impact likely1.79 mg/LJan 202642,217 served Town of Prescott ValleyNatural background0.71 mg/LMay 202657,048 served Pueblo Del Sol Water CompanyNatural background0.87 mg/LJul 202512,804 served

Q

Q Mountain Vista Mhppurchased waterNatural background0.15 mg/LJan 2026440 served Quail Creek Water CompanyNatural background0.40 mg/LJan 20266,812 served Quail Ridge DwidHuman impact likely2.80 mg/LMay 2026179 served Quail Run Water SystemNatural background0.66 mg/LMay 2026300 served Town of QuartzsiteNatural background0.15 mg/LJan 20262,761 served Town of Queen CreekHealth-study range5.94 mg/LJul 202695,502 served Queen Valley DwidHuman impact clear3.10 mg/LJan 20261,200 served

R

Rainbow AcresHuman impact clear3.30 mg/LJul 2025150 served Raindance Water CoopHuman impact likely1.70 mg/LJan 2026148 served Ranch Water Service IncNatural background0.07 mg/LAug 2025135 served Rancho Del Conejo Comm Water CoopHuman impact likely1.50 mg/LJan 2026900 served Rancho Sierrita Well AssocHuman impact likely1.70 mg/LJul 202555 served Rancho Tierra Blanca PoaNatural background0.74 mg/LApr 2026126 served Rancho Vida Rv ParkHuman impact likely1.50 mg/LMay 202657 served Rancho Wells IncNatural background0.95 mg/LJan 202659 served Ranchwood CommunityHuman impact likely2.40 mg/LOct 2025225 served Ray Water Company IncNatural background0.98 mg/LJan 20264,495 served Red Rock Acres HoaNatural background0.10 mg/LApr 202623 served Red Rock Crossing Mobile VillageNatural background0.24 mg/LMar 202650 served Retaw Water CompanyNatural background0.27 mg/LFeb 202647 served Retreat At Oak Creek DwidNatural background0.20 mg/LMar 202652 served Rillito Water Users AssocHuman impact clear3.80 mg/LApr 2026165 served Rim Country Estates MhpHuman impact likely1.30 mg/LMar 202636 served Rim Trail DwidNatural background0.40 mg/LMar 2026200 served Rincon Country East Rv ParkHuman impact clear4.50 mg/LJan 2026912 served Rincon Mesa LandownersNatural background0.71 mg/LJan 202675 served Rio Mercado WaterNatural background0.32 mg/LJul 2025266 served Rio Verde Rv ParkNatural background0.85 mg/LJul 202590 served Rio Viejo WaterNatural background0.31 mg/LJan 2026272 served Rio Vista Mobile Home ParkHealth-study range5.90 mg/LJan 2026217 served Rio Vista Ranchespurchased waterHuman impact clear3.60 mg/LJun 202659 served River City Rv ParkNatural background0.36 mg/LFeb 2026183 served River Rv RanchNatural background0.28 mg/LApr 202671 served Riverside ApartmentsHuman impact clear3.60 mg/LJan 202675 served Road Runner MhpHuman impact clear4.20 mg/LMay 202660 served Roosevelt Ranch Rv & MhpHuman impact likely1.20 mg/LFeb 2026430 served Roosevelt Resort LlcHuman impact likely2.00 mg/LMar 2026139 served Rose Valley Water CompanyHuman impact likely2.20 mg/LJan 20266,202 served

S

City of SaffordHuman impact clear3.43 mg/LJul 202520,600 served Sage Valley MhpNatural background0.38 mg/LMay 202655 served Saguaro Acres CfdHuman impact likely1.22 mg/LFeb 2026175 served Saguaro Mobile Home ParkHuman impact clear3.00 mg/LMar 202636 served Saguaro View Mgmt CompanyHuman impact likely2.30 mg/LJan 2026400 served Saguaro Water CompanyHuman impact likely2.00 mg/LJan 20263,243 served Sahuarita Village Water Companypurchased waterHuman impact likely2.46 mg/LFeb 202693 served Sahuarita Water CompanyHuman impact likely2.46 mg/LFeb 202618,178 served Salome Water CompanyHuman impact likely2.90 mg/LJan 2026317 served Samalayuca Improvement AssocHuman impact likely1.40 mg/LJan 2026150 served City of San LuisNatural background0.03 mg/LNov 202539,705 served San Simon DwidNatural background0.51 mg/LMay 2026312 served Sandario Water CompanyHuman impact clear3.80 mg/LJan 2026870 served Sanders School DistrictHuman impact likely1.50 mg/LMay 2026350 served Santa Rita Heights MhpNatural background0.54 mg/LJan 202650 served City of ScottsdaleHuman impact likely2.97 mg/LJun 2026241,361 served Sedona Venture Water CompanyNatural background0.44 mg/LMay 2026480 served Seven Canyons of SedonaHuman impact likely1.60 mg/LFeb 2025195 served Shae Water CompanyHuman impact likely2.90 mg/LJan 202654 served Shangri La RanchHuman impact likely2.30 mg/LJan 2026345 served Shepard Water CompanyHuman impact likely2.16 mg/LJun 2026430 served Sherman Pines Water CompanyHuman impact clear3.80 mg/LOct 2025110 served Shiloh Water CompanyNatural background0.56 mg/LFeb 2026309 served City of Show LowNatural background0.12 mg/LApr 202617,139 served Show Low Crossroads HoaNatural background0.98 mg/LFeb 202538 served Show Low Pines Well 3Natural background0.03 mg/LJul 202557 served Sierra Court Mhc LlcHuman impact likely2.20 mg/LFeb 202651 served Sierra Pacific Mobile ManorNatural background0.03 mg/LFeb 2026816 served Sierra Vista Mh VillageNatural background0.59 mg/LJan 2026328 served Sierra Vista Rv ParkHealth-study range8.40 mg/LJan 2026200 served Sierrita Mountain Water CoopHuman impact likely1.70 mg/LJan 2026258 served Siete Casas Joint VentureHuman impact likely2.20 mg/LJan 202625 served Signal Peak Water Companypurchased waterHealth-study range9.00 mg/LApr 202699 served Silver Cholla LlcHealth-study range6.60 mg/LOct 2025168 served Silver Creek Rv ParkHuman impact likely2.80 mg/LJun 2026280 served Silverbell Irrigation & Drainage DistHealth-study range6.31 mg/LMay 2026375 served Silverview Rv ParkHuman impact clear3.10 mg/LFeb 2026800 served Sky Hi DwidNatural background0.21 mg/LMar 2026390 served Skyline Resort Rv ParkHealth-study range5.25 mg/LJan 2026375 served Snowbird Rv ParkNatural background0.33 mg/LFeb 2026180 served Town of SnowflakeNatural background0.67 mg/LMar 20265,590 served So Hi DwidHuman impact likely2.40 mg/LFeb 2026503 served Softwinds Mobile Home ParkAbove the federal limit11.50 mg/LApr 202670 served Solitude Trails Dwidpurchased waterHuman impact clear3.70 mg/LMay 202690 served City of SomertonNatural background0.03 mg/LFeb 202614,197 served Sonoita Valley (North) Water CompanyHuman impact clear3.10 mg/LApr 202649 served Sonoita Valley (South) Water CompanyHuman impact clear3.10 mg/LApr 2026169 served Sontel Water CoopHealth-study range5.40 mg/LJan 202680 served Southern Sunrise Wc Cochise HorseshoeHuman impact likely2.20 mg/LMay 20261,588 served Southern Sunrise Wc Miracle ValleyNatural background0.36 mg/LMay 2026620 served Southland Utilities - Golden AcresNatural background0.22 mg/LJan 20261,614 served Spanish Trail Water CompanyHuman impact likely2.50 mg/LJan 20263,822 served Town of SpringervilleNatural background0.73 mg/LMay 20261,972 served St David DwidNatural background0.37 mg/LJan 20261,255 served City of St JohnsNatural background0.03 mg/LMay 20263,500 served Town of Star Valley Water DepartmentHuman impact likely1.60 mg/LOct 20251,157 served Stratman Water CompanyNatural background0.35 mg/LJan 2026105 served Sulger Water Company 2Natural background0.38 mg/LMay 202667 served Summit Water CoopHealth-study range8.48 mg/LMay 202653 served Sun Leisure Estates Improvement DistrictHuman impact clear3.74 mg/LJun 2026143 served Sun Shiners MhpHuman impact likely1.30 mg/LMar 2026136 served Sun Valley Farms Unit ViHealth-study range6.00 mg/LJan 2026600 served Sun Valley UtilitiesNatural background0.03 mg/LFeb 2026287 served Sunland Water CompanyHealth-study range7.45 mg/LJun 2026227 served Sunrise Vista Utilitiespurchased waterHuman impact clear3.60 mg/LJun 20261,500 served Sunrise Water CompanyHuman impact clear4.30 mg/LJan 20266,490 served Sunset Mobile Home ParkNatural background0.55 mg/LMar 2026250 served Superstition Water CoopHuman impact likely1.80 mg/LJan 202645 served Surprise City of - Mountain VistaHuman impact likely2.71 mg/LApr 202640,007 served Surprise, City of Buena VistaNatural background0.83 mg/LApr 2026520 served Sweet Springs Mobile Home ParkNatural background0.91 mg/LJan 202685 served Sweetwater Ranch - Town of TaylorNatural background0.21 mg/LMar 2026180 served

T

Tacna Water Improvement DistrictNatural background0.12 mg/LMar 2026500 served Tall Pines Estates WaterHuman impact likely1.00 mg/LMar 2026156 served Town of TaylorHuman impact likely1.20 mg/LMar 20264,190 served City of TempeNatural background0.70 mg/LApr 2026165,000 served The Grand AcresHuman impact clear4.50 mg/LApr 2026153 served The Oaks Mobile Home ParkNatural background0.03 mg/LFeb 2026180 served Thim Utility CompanyHuman impact likely1.30 mg/LJan 2026310 served Thim Utility Company - ParkinHuman impact likely1.70 mg/LJan 202669 served Thim Utility Company - Rancho VistaHuman impact likely1.10 mg/LJan 2026105 served Thim Utility Company - Well 9Human impact likely1.91 mg/LAug 2025254 served Thim Utility Company 2Human impact likely1.20 mg/LMay 2026445 served Thim Water Company 2Human impact likely1.70 mg/LJan 2026247 served Thunderbird Farms DwidHealth-study range6.33 mg/LApr 20262,231 served Tierra Linda Hoa Water CompanyNatural background0.91 mg/LJan 2026266 served Timber Knoll DwidNatural background0.32 mg/LMay 2026153 served Timberland Acres DwidNatural background0.06 mg/LJul 2025922 served Timberline MhpNatural background0.10 mg/LMar 2026350 served City of TollesonHuman impact clear4.70 mg/LJan 20269,300 served City of TombstoneHuman impact likely2.72 mg/LJun 20261,545 served Tonto Basin Water - Cactus ForestHuman impact likely2.40 mg/LJan 2026613 served Tonto Basin Water - Lr Gardens WestNatural background0.61 mg/LOct 20251,172 served Tonto Basin Water Roosevelt Lake EstatesHuman impact likely1.90 mg/LMay 2026508 served Tonto Creek Water CompanyNatural background0.17 mg/LMay 2026190 served Tonto Hills DwidNatural background0.41 mg/LDec 2024350 served Town & Country - PrestonNatural background0.57 mg/LJul 2025430 served Town & Country EstatesNatural background0.93 mg/LJul 2025960 served Trails West Mhppurchased waterNatural background0.84 mg/LApr 2026500 served Trillium Water SystemHuman impact likely1.30 mg/LApr 20261,100 served Triple G DairyHuman impact likely1.80 mg/LJan 202684 served Trujillo Trail DwidNatural background0.58 mg/LFeb 202675 served City of TucsonHealth-study range5.28 mg/LJun 2026732,906 served Tucson Water Corona De TucsonHuman impact likely1.30 mg/LFeb 202510,217 served Twin Buttes Rv, LlcHuman impact clear3.10 mg/LJan 202679 served Two Tanks Community WellHuman impact clear4.20 mg/LJan 202676 served

U

Us Army Fort HuachucaHuman impact likely1.08 mg/LMay 202615,603 served Usaf Davis Monthan AfbHuman impact likely1.30 mg/LFeb 202618,640 served Usaf Luke Air Force BaseHuman impact clear4.80 mg/LJan 20258,440 served Usdj Fbp Fed Corr Inst SaffordNatural background0.03 mg/LFeb 2026949 served Usfs Knf Tusayan Adminpurchased waterNatural background0.19 mg/LJun 202680 served Usmc Yuma Main SystemHuman impact likely1.40 mg/LFeb 20268,353 served Utility Source LlcNatural background0.22 mg/LMar 20261,710 served

V

Vail Water CompanyHuman impact likely2.40 mg/LJan 202617,500 served Valle EscondidoHuman impact clear4.40 mg/LFeb 2026405 served Valle Verde Del NorteNatural background0.57 mg/LJan 2026300 served Valle Verde Water Company - EastHuman impact clear4.50 mg/LApr 20262,331 served Valley Pioneers Water Company IncHuman impact clear3.00 mg/LMar 20266,063 served Valley Utilities Water Company GlendaleHealth-study range8.92 mg/LJun 20265,940 served Valley View Mhc & Rv ParkHuman impact likely2.20 mg/LFeb 2026142 served Valley View Water CompanyHuman impact likely1.94 mg/LFeb 202660 served Ventura Ranch Water SystemNatural background0.71 mg/LMay 2026300 served Verde Glen DwidHuman impact likely1.10 mg/LMar 2026117 served Verde Lakes Water - Big ValleyNatural background0.19 mg/LMay 2026870 served Verde Lakes Water - Dinky CreekNatural background0.17 mg/LMay 2026875 served Verde Valley ManorNatural background0.99 mg/LMay 2026275 served Vernon DwidNatural background0.52 mg/LMay 2026100 served Vernon Valley Water SystemNatural background0.34 mg/LMay 202654 served Via Verde West MhpNatural background0.23 mg/LJan 2026156 served Vicksburg FarmHuman impact likely2.86 mg/LApr 2026220 served Villa Grande DwidHuman impact clear4.24 mg/LMay 2026283 served Virgin Mountain Estates MhpHuman impact likely1.70 mg/LMar 2026100 served Virgin Mountain Utilities CompanyHuman impact likely1.30 mg/LFeb 2025200 served Vista Del Norte MhpHuman impact clear3.50 mg/LJul 2025554 served Voyager At White Mountain Lakes WcNatural background0.68 mg/LMay 20261,997 served Voyager Water CompanyNatural background0.84 mg/LApr 20263,209 served Vwc Buckeye Div Bulfer PrimroseHealth-study range8.35 mg/LMay 2026280 served Vwc Buckeye Division Sun ValleyHuman impact likely1.80 mg/LJan 20261,378 served

W

W Ranch ResortHuman impact likely2.12 mg/LJun 2026200 served Walden Meadows Comm CoopHuman impact clear3.00 mg/LFeb 2026880 served Walnut Creek Water CompanyHuman impact clear3.70 mg/LFeb 2026728 served Watco WaterNatural background0.49 mg/LFeb 20261,153 served Wells Fargo Water CompanyHuman impact likely1.70 mg/LJan 202683 served Town of WelltonNatural background0.32 mg/LMay 20263,000 served Wenden DwidHuman impact clear3.56 mg/LFeb 2026360 served West End Water Company - WheatNatural background0.55 mg/LJan 202655 served West End Water Company - WittmanNatural background0.61 mg/LJan 20261,200 served Whetstone DwidNatural background0.55 mg/LJan 2026940 served Whetstone Ranch Water SystemNatural background0.97 mg/LJan 2026183 served Whetstone Village MhpHuman impact clear3.00 mg/LJan 202650 served Whispering Wind Mobile Home ParkHealth-study range6.40 mg/LJan 2026200 served Whispering Winds ApartmentsHuman impact likely1.50 mg/LJun 202660 served White Hills Trailer ParkNatural background0.17 mg/LMay 2026150 served White Horse Ranch Owners AssociationNatural background0.34 mg/LJun 2026292 served White Mountain Summer Homes DwidNatural background0.34 mg/LMar 20261,233 served White Mountain Water CompanyNatural background0.03 mg/LJun 2026475 served White Tank Well IncHuman impact likely1.01 mg/LMar 202687 served Why DwidHuman impact clear4.00 mg/LJul 2025400 served Town of WickenburgHuman impact clear3.96 mg/LJun 20266,481 served Wickenburg Ranch EstatesHuman impact likely2.30 mg/LFeb 20262,877 served Wildcat One Well CoopNatural background0.63 mg/LJan 202652 served Wildflower Water CoopHuman impact likely1.70 mg/LJan 2026157 served City of WillcoxNatural background0.03 mg/LJan 20263,236 served City of WilliamsNatural background0.30 mg/LMay 20263,145 served Willow Lakes Property Owners AssocHuman impact likely1.10 mg/LMay 2026190 served Wilmot Water Users GroupNatural background0.78 mg/LJan 202630 served City of WinslowNatural background0.19 mg/LJun 20269,789 served Winterhaven Water DevelopmentHuman impact clear4.30 mg/LOct 2025685 served Wonderland Acres DwidNatural background0.98 mg/LMar 2026380 served Woodruff Domestic Water Company IncNatural background0.26 mg/LJun 2026140 served Worden Water CompanyHuman impact likely1.30 mg/LJan 202660 served

Y

Yarnell Water Improvement AssociationHuman impact likely2.90 mg/LFeb 2026515 served Yavapai Country Club Estates Water Copurchased waterHuman impact likely1.70 mg/LFeb 2026100 served Yavapai Water CompanyHuman impact likely2.20 mg/LFeb 2026728 served Yucca Water AssociationHuman impact clear3.20 mg/LJun 2026250 served City of YumaNatural background0.66 mg/LMay 2026103,264 served Yuma West MhpNatural background0.06 mg/LOct 202530 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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