Oklahoma

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Oklahoma system directory

Find a community water system

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

863

systems with a current result

3,637,673

people served by them

318

systems carrying a supplier result

139

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 863 of 863 systems

0-9

4T Investors LlcHuman impact clear3.57 mg/LDec 202598 served 51 East Waterpurchased waterHuman impact likely1.26 mg/LJan 20262,500 served

A

Abes Rv ParkNatural background0.90 mg/LJan 2026175 served AchilleHuman impact clear3.25 mg/LJan 2026506 served AdaNatural background0.79 mg/LJan 202622,600 served Adairpurchased waterNatural background0.12 mg/LApr 2026704 served Adair Co Rwd #1 (Cherry Tree)purchased waterNatural background0.72 mg/LJan 20262,000 served Adair Co Rwd #2purchased waterNatural background0.72 mg/LJan 20261,675 served Adair Co Rwd #3purchased waterNatural background0.72 mg/LJan 20262,598 served Adair Co Rwd #4purchased waterNatural background0.72 mg/LJan 20261,025 served Adair Co Rwd #5Human impact likely1.16 mg/LNov 2025675 served Adair Co Rws & Swmd #6Natural background0.05 mg/LMar 202527 served Adamson Rwd #8purchased waterNatural background0.26 mg/LDec 20254,221 served Afton PwaNatural background0.12 mg/LMar 20261,428 served AlexNatural background0.05 mg/LJun 2026635 served Alfalfa Co Rws & Swmd #1Health-study range6.60 mg/LMar 2024550 served Alfalfa Co Rws & Swmd #1 NorthHealth-study range9.26 mg/LMar 2024600 served AlineAbove the federal limit10.30 mg/LJun 2026214 served Allen PwaHuman impact clear3.98 mg/LJan 2026937 served AltusNatural background0.25 mg/LApr 202518,717 served Altus Afbpurchased waterNatural background0.25 mg/LApr 20254,617 served AlvaHealth-study range8.30 mg/LApr 20265,208 served AmesHuman impact likely1.84 mg/LDec 2025199 served Anadarko Public Works AuthorityNatural background0.59 mg/LMar 20266,804 served Antlers PwaNatural background0.10 mg/LFeb 20262,547 served ApacheHuman impact clear3.98 mg/LFeb 20261,521 served Arapahopurchased waterNatural background0.25 mg/LJan 2024748 served Arcadia Public Works Authoritypurchased waterHuman impact likely1.12 mg/LAug 2025300 served ArdmoreNatural background0.23 mg/LMay 202624,893 served ArnettHealth-study range8.84 mg/LMay 2026496 served Asher Util Dev Authpurchased waterNatural background0.10 mg/LJan 2026375 served AtokaNatural background0.29 mg/LFeb 20262,988 served Atoka Co. Rwd #1 (Wardville)purchased waterNatural background0.10 mg/LFeb 2026125 served Atoka Co. Rwd #2purchased waterNatural background0.29 mg/LFeb 2026500 served Atoka Co. Rwd #3 (Caney)Human impact likely1.72 mg/LJan 20261,500 served Atoka Co. Rws & Swmd #4Natural background0.29 mg/LJan 20263,000 served Avant Utilities AuthorityNatural background0.51 mg/LDec 2025361 served

B

Bar-Dew Water Assoc Incpurchased waterNatural background0.12 mg/LDec 2025130 served BarnsdallNatural background0.12 mg/LJan 20251,243 served BartlesvilleNatural background0.12 mg/LDec 202534,748 served BeaverHealth-study range5.07 mg/LJan 20261,570 served Beaver Co Rwd #1 TurpinHuman impact clear3.07 mg/LJun 2026412 served Beaver Co Rwd #2 (Gate)Health-study range5.46 mg/LMar 202587 served Beckham Co Rwd # 1Above the federal limit10.20 mg/LApr 20261,595 served Beckham Co Rwd # 2Health-study range6.92 mg/LMay 2026857 served Beckham Co Rwd # 3Health-study range5.20 mg/LFeb 20261,617 served BeggsNatural background0.25 mg/LDec 20251,364 served Bernice PwaNatural background0.12 mg/LDec 2023504 served Bessiepurchased waterHealth-study range6.08 mg/LMay 2026190 served BethanyHuman impact likely2.80 mg/LJan 202420,307 served Big Cabin Pwapurchased waterNatural background0.23 mg/LOct 2025293 served Billings PwaNatural background0.67 mg/LApr 2025436 served Binger PwaHuman impact clear3.77 mg/LJan 2026708 served Bixby Estatespurchased waterNatural background0.10 mg/LJan 2026225 served Bixby Public Works Authoritypurchased waterNatural background0.10 mg/LJan 202618,750 served Blackwell Municipal AuthorityNatural background0.25 mg/LJun 20267,668 served Blair Public Works AuthorityHealth-study range7.56 mg/LJan 2026894 served Blanchardpurchased waterNatural background0.68 mg/LJan 20252,966 served Blue Jacket PwaNatural background0.12 mg/LSep 2025274 served Blue Quail EstatesHuman impact clear4.50 mg/LJan 2026350 served Blue Quail Logan CountyNatural background0.73 mg/LFeb 2024188 served Boiling Springs EstatesHealth-study range5.11 mg/LMay 202540 served Boise City PwaHuman impact clear4.48 mg/LDec 20251,483 served BokchitoNatural background0.10 mg/LFeb 2025564 served Bokoshe Pwapurchased waterNatural background0.05 mg/LApr 2025450 served Boswell Public Works Authoritypurchased waterNatural background0.29 mg/LJan 2026932 served Bowlegs Lima WaterNatural background0.05 mg/LJan 20262,500 served Boynton Pwapurchased waterNatural background0.29 mg/LApr 2025450 served Boys Ranch TownHuman impact likely2.70 mg/LMay 202675 served Braggs Water WorksHuman impact likely1.35 mg/LDec 20251,030 served Bramanpurchased waterNatural background0.25 mg/LJun 2026244 served Breckinridge PwaAbove the federal limit10.40 mg/LJun 2026239 served BridgeportHealth-study range6.33 mg/LFeb 2026109 served Bristow Municipal AuthorityHealth-study range5.58 mg/LDec 20253,700 served Broken Arrow Municipal AuthorityNatural background0.08 mg/LSep 2025116,330 served Broken Bow PwaNatural background0.10 mg/LFeb 20264,320 served BromideNatural background0.99 mg/LFeb 2026163 served Bryan Co. Rwd #6Natural background0.10 mg/LFeb 2026990 served Bryan Co. Rwd #7Natural background0.10 mg/LFeb 2026302 served Bryan Co. Rwd #9Human impact clear3.81 mg/LJan 2026820 served Bryan Co. Rws & Swmd #2Natural background0.10 mg/LJan 20266,270 served Bryan County Rural Water District #5Natural background0.10 mg/LJan 20268,325 served BuffaloHealth-study range7.73 mg/LMar 20251,200 served Burlingtonpurchased waterHealth-study range9.26 mg/LMar 2024156 served Burns Flat PwsHealth-study range7.27 mg/LJan 20252,057 served Burnt Cabin RwdNatural background0.33 mg/LDec 2025208 served Butlerpurchased waterNatural background0.05 mg/LMar 2025345 served ByarsHuman impact likely2.15 mg/LJan 2026275 served

C

CaairNatural background0.05 mg/LApr 2025100 served CacheNatural background0.10 mg/LFeb 20262,371 served CaddoNatural background0.86 mg/LJan 2026944 served Caddo Co Rwd #1 (Lookeba)Human impact likely1.98 mg/LFeb 2026275 served Caddo Co Rwd #3Human impact likely2.85 mg/LMar 20263,900 served Calera PwaNatural background0.83 mg/LJan 20262,815 served CalumetAbove the federal limit10.70 mg/LMay 2026600 served CalvinHuman impact likely2.17 mg/LJan 2026300 served Cameron Pwapurchased waterNatural background0.05 mg/LApr 2025302 served Canadian Co Rwd # 1Above the federal limit15.00 mg/LJun 2026750 served Canadian Co Rwd # 4Human impact likely1.34 mg/LMar 2026907 served Canadian Co Rws & Swmd #5purchased waterNatural background0.25 mg/LJun 2025316 served Canadian Co Water Authoritypurchased waterNatural background0.68 mg/LJan 20251,700 served CantonHealth-study range7.28 mg/LFeb 2025650 served CanuteHealth-study range6.98 mg/LMar 2026524 served Cardinal Hill SubdivisionHuman impact clear3.36 mg/LFeb 2026475 served Carmen Public Works AuthorityHuman impact likely1.54 mg/LSep 2025355 served CarnegieHealth-study range7.86 mg/LJan 20261,637 served CarneyNatural background0.71 mg/LJan 2026649 served Carriage HillsNatural background0.05 mg/LJul 2025160 served Carriage Villagepurchased waterNatural background0.10 mg/LJan 2026500 served Carterpurchased waterAbove the federal limit10.20 mg/LApr 2026330 served Cashionpurchased waterHealth-study range9.92 mg/LApr 2026900 served Catoosapurchased waterNatural background0.10 mg/LJan 20262,668 served Cedar Crest Country Clubpurchased waterNatural background0.30 mg/LNov 2025315 served Cementpurchased waterHuman impact likely1.99 mg/LJun 2026530 served ChandlerNatural background0.25 mg/LOct 20253,142 served Chattanooga PwsHealth-study range6.59 mg/LFeb 2026627 served Checotah PwaNatural background0.82 mg/LMar 20253,481 served Chelsea Economic Dev. Auth.Natural background0.21 mg/LOct 20251,964 served CherokeeNatural background0.25 mg/LOct 20251,630 served Cherokee Co. Rwd # 16 (Chicken Creek)Natural background0.36 mg/LJan 2026272 served Cherokee Co. Rwd # 16 (Lakewood)Natural background0.38 mg/LJan 2026200 served Cherokee Co. Rwd # 16 (Wildcat)Natural background0.44 mg/LJan 2026200 served Cherokee Co. Rwd # 16 (Woodhaven)Natural background0.29 mg/LJan 2026200 served Cherokee Co. Rwd #1 (Ft Gibson)Natural background0.25 mg/LApr 2025710 served Cherokee Co. Rwd #11Natural background0.87 mg/LJun 20263,395 served Cherokee Co. Rwd #12Natural background0.12 mg/LApr 202695 served Cherokee Co. Rwd #13Natural background0.12 mg/LOct 20251,640 served Cherokee Co. Rwd #2 (Keys)Natural background0.78 mg/LFeb 20261,493 served Cherokee Co. Rwd #3 (Grandview)Human impact likely2.50 mg/LFeb 20262,300 served Cherokee Co. Rwd #7 (Welling)purchased waterHuman impact likely1.98 mg/LFeb 2026418 served Cherokee Co. Rwd #8 (Briggs)purchased waterHuman impact likely1.98 mg/LFeb 2026413 served Cherokee Co. Rwd #9purchased waterNatural background0.87 mg/LJun 2026200 served CheyenneNatural background0.63 mg/LJan 2025778 served Chickasha Lake ParkNatural background0.45 mg/LJan 202650 served Chickasha Municipal AuthorityNatural background0.46 mg/LJan 202616,036 served Chisholm Creek Housing Additionpurchased waterHealth-study range8.68 mg/LMay 202675 served Choctaw Co. Rwd #1Natural background0.10 mg/LFeb 20262,300 served Choctaw Co. Rwd #2purchased waterNatural background0.10 mg/LFeb 2026373 served Choctaw Co. Rwsg & Swmd #3purchased waterNatural background0.10 mg/LFeb 2026235 served Choctaw Co. Rwsg & Swmd #6purchased waterNatural background0.29 mg/LJan 2026850 served Choctaw Estates, LlcHuman impact likely1.19 mg/LSep 2025105 served Choctaw UaHuman impact likely1.49 mg/LOct 20253,926 served Chouteaupurchased waterNatural background0.30 mg/LNov 20252,100 served ClaremoreNatural background0.12 mg/LApr 202615,873 served Clarita-Olney Rwdpurchased waterNatural background0.10 mg/LJan 2026360 served Clayton Pwapurchased waterNatural background0.10 mg/LJan 2026719 served Clemmer Water Associationpurchased waterNatural background0.79 mg/LMar 202647 served Cleo SpringsHuman impact likely1.26 mg/LJun 2026326 served Cleveland Co Rw,S,G&Swmd #1Natural background0.21 mg/LFeb 202680 served Cleveland Municipal AuthorityNatural background0.12 mg/LAug 20253,262 served ClintonNatural background0.25 mg/LJan 20248,883 served Coal Co Rw&Swmg #6purchased waterNatural background0.10 mg/LJan 2026150 served Coal Co Rwd #5purchased waterNatural background0.10 mg/LJan 2026366 served Coalgate PwaNatural background0.10 mg/LJan 20262,005 served Coffee Creek Mhp, LlcHealth-study range5.47 mg/LSep 2025120 served Colbert Boat ClubHuman impact clear4.14 mg/LFeb 202654 served Colbert PuaHuman impact clear3.87 mg/LFeb 20262,312 served CollinsvilleNatural background0.12 mg/LFeb 20265,400 served Comanche Co Rwd #1purchased waterNatural background0.79 mg/LMar 20262,800 served Comanche Co Rwd #2Natural background0.78 mg/LNov 20251,840 served Comanche Co Rwd #3Health-study range8.97 mg/LApr 20262,325 served Comanche Co Rwd #4purchased waterHuman impact likely2.54 mg/LJan 20253,000 served Comanche Public Works AuthorityNatural background0.25 mg/LMar 20261,649 served CommerceNatural background0.32 mg/LDec 20252,645 served Consolidated Rwd #1 Nowata And Rogers Copurchased waterNatural background0.21 mg/LOct 20251,580 served Consolidated Rwd #3 Creek Copurchased waterNatural background0.26 mg/LMar 20253,500 served Copan PwaNatural background0.37 mg/LDec 2024733 served Corn PwaHealth-study range5.57 mg/LJan 2026500 served Cornishpurchased waterNatural background0.10 mg/LMar 202641 served Corral Kreek Subdivpurchased waterNatural background0.34 mg/LDec 2025273 served Cotton Co Rwd #2Natural background0.25 mg/LDec 20253,000 served Country East MhpHealth-study range5.77 mg/LJun 202697 served Country Haven MhpNatural background0.05 mg/LSep 202330 served Country MhpHuman impact clear3.73 mg/LSep 202550 served Coves At Bird Islandpurchased waterNatural background0.33 mg/LNov 2025100 served Covingtonpurchased waterHealth-study range8.68 mg/LMay 2026553 served Coweta PwaNatural background0.33 mg/LDec 20259,450 served Coylepurchased waterNatural background0.25 mg/LDec 2025289 served Craig Co Rwd #1purchased waterNatural background0.23 mg/LOct 2025315 served Craig Co Rwd #2purchased waterNatural background0.42 mg/LNov 20254,250 served Craig Co Rws & Swmd #3Natural background0.12 mg/LSep 20251,100 served Creek Co Rwd # 1Natural background0.26 mg/LMar 20255,675 served Creek Co Rwd # 2purchased waterNatural background0.16 mg/LFeb 202612,788 served Creek Co Rwd # 4purchased waterNatural background0.10 mg/LJan 2026575 served Creek Co Rwd # 5Natural background0.25 mg/LDec 20252,500 served Creek Co Rwd # 7Natural background0.28 mg/LDec 20252,100 served CrescentHealth-study range6.32 mg/LDec 20251,411 served Creta Water Corporationpurchased waterNatural background0.25 mg/LApr 2025230 served CushingNatural background0.25 mg/LDec 20258,371 served Custer City PwsHuman impact likely1.52 mg/LMay 2026393 served Custer County Rwd #3Human impact likely1.67 mg/LMar 2025960 served Cyrilpurchased waterHuman impact likely2.85 mg/LMar 20261,168 served

D

Dacoma Pwapurchased waterHealth-study range8.30 mg/LApr 2026148 served Davenport Utility Authpurchased waterNatural background0.25 mg/LOct 2025881 served DavidsonNatural background0.25 mg/LApr 2026375 served DavisNatural background0.28 mg/LJan 20262,610 served Deer CreekHealth-study range9.36 mg/LMar 2026147 served Deer Creek Rural Water CorpHuman impact likely1.21 mg/LJan 20265,500 served Deerfield Springspurchased waterNatural background0.12 mg/LSep 2025445 served Del CityNatural background0.24 mg/LJul 202522,128 served DelawareNatural background0.12 mg/LDec 2025456 served Delaware Co Rwd # 1purchased waterNatural background0.84 mg/LFeb 2026465 served Delaware Co Rwd # 12Natural background0.05 mg/LMar 2025785 served Delaware Co Rwd # 3Natural background0.28 mg/LDec 2025653 served Delaware Co Rwd # 7purchased waterNatural background0.33 mg/LNov 2025400 served Delaware Co Rwd #10Natural background0.05 mg/LMay 20251,295 served DepewNatural background0.25 mg/LNov 2025555 served Devolpurchased waterAbove the federal limit11.60 mg/LApr 2026150 served Dewarpurchased waterNatural background0.21 mg/LJan 2026917 served Dewey Co Rwd #1Natural background0.86 mg/LApr 2026129 served Dewey Co Rwd #2Human impact clear4.63 mg/LJun 2024150 served Dewey Co Rwd #3Human impact clear4.74 mg/LJun 2025755 served Dewey Public Works Authoritypurchased waterNatural background0.12 mg/LDec 20253,490 served Diamondhead Homeowners Assocpurchased waterNatural background0.12 mg/LMar 202650 served Dill CityAbove the federal limit18.00 mg/LMay 2026526 served Doughertypurchased waterNatural background0.74 mg/LMar 2026224 served Douglaspurchased waterHuman impact likely1.28 mg/LDec 202532 served Dover Public Works Trust AuthHealth-study range7.13 mg/LFeb 2024400 served Drummondpurchased waterHealth-study range8.68 mg/LMay 2026405 served DrumrightNatural background0.25 mg/LSep 20252,876 served Duke Central Vue WaterHealth-study range7.60 mg/LJan 2026318 served Duke Public Water Authoritypurchased waterNatural background0.25 mg/LApr 2025425 served Duncan Public Utilities AuthorityNatural background0.34 mg/LMay 202523,000 served Durant Utilities AuthorityNatural background0.10 mg/LJan 202615,545 served Dustin Pwapurchased waterHuman impact clear3.18 mg/LMar 2025496 served

E

Eakly Development CorpHuman impact clear4.01 mg/LFeb 2026277 served East Central Oklahoma Water AuthorityNatural background0.12 mg/LOct 20251,200 served Edgewater Rv ParkHuman impact clear4.52 mg/LMar 202593 served Edmond PwaHuman impact likely1.12 mg/LAug 202579,408 served El RenoNatural background0.25 mg/LJun 202516,212 served Eldoradopurchased waterHealth-study range5.64 mg/LDec 2025446 served Elgin PwaHuman impact likely2.10 mg/LJan 20263,300 served Elk CityHealth-study range5.97 mg/LFeb 202610,510 served Ellis Co Rwd#1Human impact likely2.65 mg/LMar 202543 served Elm Bend Rwd Incpurchased waterNatural background0.12 mg/LJul 2025600 served Elmore CityNatural background0.10 mg/LFeb 2026756 served England Shores MhpNatural background0.05 mg/LOct 202555 served EnidHealth-study range8.68 mg/LMay 202649,347 served ErickHealth-study range5.85 mg/LJan 20261,023 served Eufaula PwaNatural background0.25 mg/LDec 20252,766 served

F

FairfaxNatural background0.25 mg/LOct 20251,555 served Fairland Public Works AuthorityNatural background0.12 mg/LMar 20261,025 served Fairmontpurchased waterHealth-study range8.68 mg/LMay 2026147 served FairviewAbove the federal limit11.30 mg/LSep 20232,690 served Falconhead Prop Owners AssocNatural background0.92 mg/LFeb 2026350 served Falls Creek Baptist Conference CenterNatural background0.37 mg/LFeb 20267,000 served FargoHealth-study range5.87 mg/LMar 2025326 served Faxonpurchased waterAbove the federal limit11.50 mg/LApr 2026134 served FletcherNatural background0.24 mg/LMar 20251,022 served ForganHealth-study range8.52 mg/LFeb 2026532 served Fort CobbHealth-study range7.81 mg/LMay 2026667 served Fort GibsonNatural background0.34 mg/LDec 20254,700 served Fort Sill Hqusafacfspurchased waterNatural background0.79 mg/LMar 202623,000 served Fort Supply Pwapurchased waterHealth-study range5.29 mg/LAug 2025328 served Fort TowsonNatural background0.98 mg/LFeb 2026611 served FossNatural background0.19 mg/LJun 2025127 served Foss Reservoir McdNatural background0.05 mg/LMar 202512 served FrancisNatural background0.10 mg/LFeb 2026390 served FrederickNatural background0.25 mg/LOct 20253,940 served Freedompurchased waterHealth-study range8.66 mg/LMay 2026275 served Frontier Development Authpurchased waterNatural background0.05 mg/LMar 2025437 served Frontier Shores Poa Water DeptNatural background0.02 mg/LAug 2025200 served

G

GageHuman impact clear3.51 mg/LMar 2025429 served Gans Utility Authoritypurchased waterNatural background0.57 mg/LJan 2026600 served Garber Municipal Authoritypurchased waterHealth-study range8.68 mg/LMay 2026725 served Garfield Co Rwd # 4purchased waterHealth-study range8.68 mg/LMay 2026334 served Garfield Co Rwd #5Health-study range6.88 mg/LDec 20241,980 served Garfield Co Rwd #6Human impact likely1.28 mg/LDec 20251,225 served Garfield Co Rwd #7purchased waterHealth-study range8.68 mg/LMay 2026288 served Garvinpurchased waterNatural background0.10 mg/LFeb 2026150 served Garvin Co Rwd # 6 (Wells)Human impact likely2.70 mg/LFeb 20261,680 served Garvin Co Rwd #1Health-study range5.76 mg/LMay 20241,445 served Garvin Co Rwd #2Human impact likely1.38 mg/LApr 20251,570 served Garvin Co Rwd #4purchased waterNatural background0.42 mg/LMar 20251,340 served Garvin Co Rwd #6 (Sw Purchase)purchased waterNatural background0.31 mg/LFeb 2026862 served GearyHuman impact clear3.66 mg/LMay 20261,258 served Geronimopurchased waterNatural background0.79 mg/LMar 20261,200 served Glencoepurchased waterNatural background0.25 mg/LMay 2025478 served Glenpool Waterpurchased waterNatural background0.10 mg/LJan 202612,500 served Golden Oaks Home Owners AssnNatural background0.10 mg/LFeb 2026135 served Goldsby Water Auth TrustNatural background0.10 mg/LFeb 20262,000 served Goltrypurchased waterHuman impact likely2.43 mg/LMar 2026268 served GoodwellHealth-study range7.89 mg/LMar 20261,198 served Gordon'S Hollow Hoapurchased waterNatural background0.99 mg/LMar 202525 served Gore PwaNatural background0.25 mg/LNov 20251,688 served Gotebopurchased waterHuman impact likely2.85 mg/LMar 2026272 served Gould Pwapurchased waterHealth-study range5.64 mg/LDec 2025206 served Gracemont PwaHealth-study range5.57 mg/LMar 2026336 served Grady Co Rwd #1Human impact likely2.30 mg/LOct 2025300 served Grady Co Rwd #2Human impact likely1.23 mg/LJun 2026455 served Grady Co Rwd #3Natural background0.05 mg/LMar 202480 served Grady Co Rwd #6Health-study range5.22 mg/LJun 20263,930 served Grady Co Rwd #7 (Ninnekah)Human impact likely1.99 mg/LJun 20262,425 served Grand Lake PwaNatural background0.12 mg/LFeb 20262,800 served GrandfieldAbove the federal limit11.60 mg/LApr 20261,110 served Granite Pwspurchased waterHealth-study range8.97 mg/LApr 20261,425 served Grant County Rwd #1purchased waterHuman impact likely1.70 mg/LDec 2024100 served Grayhorse Rwdpurchased waterNatural background0.25 mg/LOct 2025100 served Greenfield Pwapurchased waterHuman impact clear3.66 mg/LMay 2026123 served Grove Municipal Services Auth.Natural background0.25 mg/LMar 20267,311 served GuthrieNatural background0.25 mg/LDec 20259,925 served GuymonHealth-study range7.70 mg/LMay 202611,442 served

H

Haileyvillepurchased waterNatural background0.26 mg/LDec 2025889 served Hallett Public Works AuthorityNatural background0.25 mg/LApr 2025168 served Hammonpurchased waterHealth-study range5.20 mg/LFeb 2026568 served Hanna PwaHuman impact likely1.72 mg/LSep 2024133 served Hardesty UtilitiesHuman impact likely2.31 mg/LFeb 2026277 served Harmon Electricpurchased waterHealth-study range8.97 mg/LApr 2026188 served Harmon Water CorpHealth-study range5.64 mg/LDec 20251,132 served Harper Co Rwd #1Human impact clear4.48 mg/LMar 2025198 served HarrahNatural background0.38 mg/LSep 20254,190 served Hartshornepurchased waterNatural background0.26 mg/LDec 20252,300 served Haskell Co. Water CompanyNatural background0.12 mg/LJan 20263,000 served Haskell Pwa-Swppurchased waterNatural background0.29 mg/LApr 2025250 served Haskell Pwa-WellsHuman impact likely2.76 mg/LMar 20251,765 served Haworth Pwapurchased waterNatural background0.10 mg/LFeb 2026354 served Headrickpurchased waterHealth-study range7.05 mg/LFeb 202584 served HealdtonNatural background0.10 mg/LMar 20262,785 served Heavener Utility Auth - Psgpurchased waterNatural background0.05 mg/LApr 20253,000 served HelenaHealth-study range9.18 mg/LJun 2026443 served HennesseyHuman impact clear3.27 mg/LJun 20262,058 served Henryetta Municipal AuthorityNatural background0.21 mg/LJan 20266,096 served Hickory MeadowsNatural background0.05 mg/LApr 2025157 served High Chaparral Estates MhpHuman impact likely1.62 mg/LJan 2026225 served Highpoint MhpHealth-study range7.39 mg/LMay 2026600 served Highway 69 Water Dist. (Greer'S Sausage)purchased waterNatural background0.30 mg/LNov 202543 served Hillcrest MhpHuman impact likely1.46 mg/LSep 2025400 served Hillsdale Pwapurchased waterHuman impact likely1.52 mg/LJun 2026110 served Hilltop MhpHuman impact likely1.47 mg/LSep 2025125 served HintonHealth-study range5.85 mg/LFeb 20262,600 served Hitchcock Public Works Auth.Human impact clear3.69 mg/LFeb 2026141 served Hobartpurchased waterNatural background0.05 mg/LMar 20253,746 served HoldenvilleNatural background0.69 mg/LFeb 20264,732 served Holiday Shores Prop AssnNatural background0.05 mg/LJul 2025136 served Holliday Outt MhpNatural background0.25 mg/LJan 2026100 served HollisHealth-study range5.75 mg/LMar 20262,264 served Hollisterpurchased waterAbove the federal limit11.50 mg/LApr 202660 served HominyNatural background0.37 mg/LDec 20252,584 served HookerHuman impact clear4.06 mg/LDec 20251,788 served Howard Mcleod Correctional CenterNatural background0.10 mg/LMar 2026825 served Hughes Co. Rwd #1Natural background0.10 mg/LFeb 20261,225 served Hughes Co. Rwd #2Human impact clear4.03 mg/LFeb 20261,145 served Hughes Co. Rwd #3purchased waterNatural background0.69 mg/LFeb 2026200 served Hughes Co. Rwd #5Natural background0.10 mg/LJan 2026800 served Hughes Co. Rwd #6 (Gerty)Health-study range5.90 mg/LFeb 20262,180 served Hugo Municipal AuthorityNatural background0.10 mg/LFeb 20265,536 served Hulbert PwaNatural background0.66 mg/LMay 20261,007 served Hunterpurchased waterHuman impact likely1.28 mg/LDec 2025300 served Hwy 7 East Water Assnpurchased waterNatural background0.79 mg/LMar 202650 served Hydro PwaHuman impact likely2.57 mg/LMar 20261,060 served

I

Idabel PwaNatural background0.20 mg/LFeb 20266,952 served Indiahoma Public Works AuthorityHuman impact clear3.41 mg/LJan 2026350 served Indianola Rwd #18purchased waterNatural background0.10 mg/LJan 20262,000 served Inola Water Works Incpurchased waterNatural background0.30 mg/LNov 20251,589 served Ironside Water District Incpurchased waterNatural background0.23 mg/LOct 2025392 served

J

Jackson Co Water CorpHealth-study range7.05 mg/LFeb 20252,662 served JayNatural background0.84 mg/LFeb 20262,482 served Jefferson Co Cons Rwd #1Natural background0.10 mg/LJan 20268,398 served Jenks Pwapurchased waterNatural background0.10 mg/LJan 202616,924 served JenningsNatural background0.25 mg/LMar 2025400 served JetHuman impact likely2.43 mg/LMar 2026230 served Johnston Co Rwd #3Human impact likely2.90 mg/LJan 20262,783 served Johnston Co Rws& Swmd #4Human impact likely1.02 mg/LFeb 2025600 served JonesNatural background0.25 mg/LDec 20251,727 served Joseph Harp Corr InstNatural background0.36 mg/LMar 20263,000 served

K

Kaw City Water AuthorityNatural background0.97 mg/LApr 2026372 served Kay Co Rwd #1purchased waterNatural background0.94 mg/LDec 20251,765 served Kay Co Rwd #3purchased waterNatural background0.94 mg/LDec 20251,000 served Kay Co Rwd #5 (Dale Water Corp)purchased waterNatural background0.25 mg/LDec 2025765 served Kay County Rural Water District 7purchased waterNatural background0.25 mg/LJun 2026920 served Kay County Rwd #2purchased waterNatural background0.94 mg/LDec 202550 served Kay Electric CooperativeNatural background0.92 mg/LJan 20262 served Kendrick Municipal Authoritypurchased waterNatural background0.25 mg/LJan 2026266 served KeneficNatural background0.10 mg/LFeb 2026165 served Keota Pwapurchased waterNatural background0.05 mg/LApr 2025564 served Ketchum PwaNatural background0.42 mg/LNov 20254,025 served Ketchum Pwa Delaware Co SystemNatural background0.33 mg/LNov 20251,805 served Keyes Utility Auth.Human impact likely2.43 mg/LFeb 2025315 served KingfisherHealth-study range5.69 mg/LAug 20255,073 served Kingfisher Co Rwd #3Health-study range8.08 mg/LJul 2024237 served Kingston PwaNatural background0.10 mg/LMar 20251,600 served KiowaNatural background0.10 mg/LFeb 2026731 served Kiowa Rural Water District #1purchased waterHealth-study range8.97 mg/LApr 2026135 served Konawa PwaNatural background0.36 mg/LFeb 20261,479 served Krebs Utility AuthorityNatural background0.23 mg/LFeb 20262,051 served Kremlinpurchased waterHuman impact likely1.52 mg/LJun 2026300 served Kremlin-Hillsdale Rural Water District 1Human impact likely1.52 mg/LJun 2026320 served Kusa Rwd #3purchased waterNatural background0.21 mg/LJan 2026240 served

L

Lahoma PwaHuman impact likely2.08 mg/LDec 2025577 served Lake Forest Mhppurchased waterNatural background0.68 mg/LJan 2025500 served Lakewood VillageHuman impact clear3.18 mg/LJun 2025293 served LamontHuman impact likely1.22 mg/LJun 2025417 served LangleyNatural background0.25 mg/LDec 2025950 served Langston PwaNatural background0.05 mg/LSep 20251,670 served Latimer Co. Rwd #1purchased waterNatural background0.12 mg/LFeb 20262,750 served Latimer Co. Rwd #2purchased waterNatural background0.10 mg/LJan 20261,500 served Latimer Co. Rwd #3purchased waterNatural background0.10 mg/LJan 2026175 served Latimer Co. Rwd #4Natural background0.26 mg/LFeb 2026412 served LaverneHealth-study range7.11 mg/LMar 20251,097 served LawtonNatural background0.79 mg/LMar 202692,757 served Le Ann Waterpurchased waterNatural background0.12 mg/LDec 2025750 served Leedeypurchased waterHealth-study range6.70 mg/LFeb 2024436 served Leflore Co. Consolidated Rwd #12purchased waterNatural background0.05 mg/LApr 20251,800 served Leflore Co. Rwd #1purchased waterNatural background0.05 mg/LApr 20251,758 served Leflore Co. Rwd #14purchased waterNatural background0.05 mg/LApr 20259,077 served Leflore Co. Rwd #15purchased waterNatural background0.05 mg/LApr 2025425 served Leflore Co. Rwd #18purchased waterNatural background0.27 mg/LFeb 20263,870 served Leflore Co. Rwd #2purchased waterNatural background0.05 mg/LApr 20254,700 served Leflore Co. Rwd #3purchased waterNatural background0.10 mg/LJan 20261,643 served Leflore Co. Rwd #5purchased waterNatural background0.05 mg/LApr 20251,593 served LehighNatural background0.34 mg/LFeb 2026396 served Leisure Shores Water System Assn, IncNatural background0.05 mg/LJul 2025150 served Lenapah Public Works AuthorityNatural background0.12 mg/LDec 2025298 served Leon Rwd #1 (Love County)Human impact likely2.04 mg/LMar 2025300 served LexingtonHuman impact clear4.86 mg/LJan 20262,086 served Lincoln Co Rw & Sewer Dist 4Natural background0.96 mg/LJul 20252,525 served Lincoln Co Rwd #1Natural background0.25 mg/LDec 2025404 served Lincoln Co Rwd #2purchased waterNatural background0.25 mg/LOct 2025400 served Lincoln Co Rwd #3purchased waterNatural background0.25 mg/LOct 2025575 served Lindsay PwaNatural background0.05 mg/LApr 20252,850 served Locust Grove PwaNatural background0.32 mg/LNov 20241,600 served Logan Co Rwd #1Human impact likely1.85 mg/LDec 20258,907 served Logan Co Rwd #2Health-study range9.92 mg/LApr 20261,146 served Logan Co Rws & Swmd #3Health-study range8.57 mg/LJun 20261,618 served Lone Chimney Water AssociationNatural background0.25 mg/LMay 2025150 served Lone GroveNatural background0.10 mg/LFeb 20264,863 served Lone Wolfpurchased waterHealth-study range8.97 mg/LApr 2026440 served LongdaleHealth-study range7.86 mg/LJun 2026363 served Longtown Rw&Sd #1 (Pittsburg Co.)Natural background0.10 mg/LJan 20265,444 served LoyalHealth-study range7.58 mg/LMar 202681 served LutherHuman impact likely2.63 mg/LSep 2025650 served

M

Mack Alford Correctional CenterNatural background0.10 mg/LJul 2025952 served MadillNatural background0.25 mg/LDec 20253,410 served Magnolia ParkHuman impact clear4.12 mg/LFeb 202650 served Major County Rwd #1Above the federal limit10.50 mg/LFeb 20251,000 served ManchesterHuman impact likely1.70 mg/LDec 2024104 served Mangum PwsHealth-study range9.01 mg/LJun 20262,924 served Manitoupurchased waterNatural background0.25 mg/LOct 2025278 served MannfordNatural background0.12 mg/LMar 20263,935 served Mannsville Public Works AuthorityHuman impact clear4.33 mg/LFeb 2026587 served Marietta PwaNatural background0.35 mg/LJan 20262,626 served MarlandHuman impact likely2.24 mg/LDec 2025325 served Marlow Municipal AuthorityHuman impact likely1.74 mg/LFeb 20264,600 served Marshallpurchased waterHealth-study range8.57 mg/LJun 2026258 served Marshall County Rural Water District #2Natural background0.17 mg/LMar 202617,587 served Marthapurchased waterNatural background0.25 mg/LApr 2025205 served Mason Trailer ParkHealth-study range5.02 mg/LDec 202550 served MaudNatural background0.20 mg/LFeb 20261,136 served Mayes Co Rwd # 2purchased waterNatural background0.30 mg/LNov 20256,280 served Mayes Co Rwd # 3Human impact likely1.63 mg/LMay 20252,400 served Mayes Co Rwd # 5purchased waterNatural background0.30 mg/LNov 20253,360 served Mayes Co Rwd # 6Natural background0.12 mg/LApr 20263,750 served Mayes Co Rwd # 7purchased waterNatural background0.30 mg/LNov 2025538 served Mayes Co Rwd # 8purchased waterNatural background0.25 mg/LDec 2025450 served Mayes Co Rwd # 9Natural background0.12 mg/LFeb 20252,578 served Mayes Co Rwd #4purchased waterNatural background0.30 mg/LNov 20254,183 served MaysvilleNatural background0.51 mg/LFeb 20251,212 served Mcalester PwaNatural background0.05 mg/LDec 202518,206 served Mcclain Co Rwd # 8Natural background0.73 mg/LFeb 20261,897 served Mcclain County Rw & Sd #9purchased waterNatural background0.71 mg/LAug 2025250 served Mccord Rwd #3purchased waterNatural background0.94 mg/LDec 20251,800 served Mccurtain Co. Rwd #1purchased waterNatural background0.10 mg/LFeb 20263,842 served Mccurtain Co. Rwd #2purchased waterNatural background0.10 mg/LFeb 2026755 served Mccurtain Co. Rwd #5 (Hochatown)purchased waterNatural background0.10 mg/LFeb 20261,614 served Mccurtain Co. Rwd #6 (Kiamichi)purchased waterNatural background0.10 mg/LFeb 2026600 served Mccurtain Co. Rwd #7purchased waterNatural background0.10 mg/LFeb 20261,847 served Mccurtain Co. Rwd #8 (Mt. Fork Water)Natural background0.10 mg/LJan 20265,685 served Mccurtain Co. Rwd #9purchased waterNatural background0.10 mg/LFeb 2026999 served Mccurtain Municipal Authoritypurchased waterNatural background0.05 mg/LApr 2025560 served Mcintosh Co. Rwd #13 (Wells)Human impact likely1.72 mg/LJan 20261,465 served Mcintosh Co. Rwd #3 (Victor)purchased waterNatural background0.82 mg/LMar 2025920 served Mcintosh Co. Rwd #5purchased waterNatural background0.82 mg/LMar 20251,900 served Mcintosh Co. Rwd #6 (Vivian)Human impact clear3.06 mg/LFeb 20261,500 served Mcintosh Co. Rwd #7purchased waterNatural background0.82 mg/LMar 2025200 served Mcintosh Co. Rwd #8 (Texanna)Natural background0.12 mg/LMar 20263,574 served Mcintosh Co. Rws & Swmd #2 (Onapa)Natural background0.10 mg/LFeb 20262,774 served Mcintosh Co. Rws & Swmd #9purchased waterNatural background0.82 mg/LMar 20251,761 served McloudNatural background0.86 mg/LSep 20252,939 served MedfordHealth-study range7.22 mg/LMay 20261,172 served Medicine Parkpurchased waterNatural background0.79 mg/LMar 2026382 served Meeker Public Works Authoritypurchased waterNatural background0.25 mg/LApr 20261,044 served MenoHuman impact clear3.03 mg/LDec 2025195 served Merritt Mobile Home & Rv ParkHealth-study range8.67 mg/LMay 202670 served MiamiNatural background0.33 mg/LApr 202613,704 served Midwest CityNatural background0.25 mg/LJan 202655,935 served Milburn Public Works Authoritypurchased waterHuman impact likely2.90 mg/LJan 2026317 served Mill CreekHuman impact likely1.62 mg/LFeb 2026310 served MincoNatural background0.94 mg/LDec 20251,632 served Moore Public Works AuthorityNatural background0.64 mg/LMar 202655,083 served MoorelandHealth-study range9.10 mg/LMar 20261,226 served Morrispurchased waterNatural background0.12 mg/LMay 20261,460 served Morrison Public Works Auth.purchased waterHuman impact likely1.26 mg/LJan 2026950 served Mountain Park Public Works Authpurchased waterHuman impact likely2.54 mg/LJan 2025473 served Mountain View PwaHuman impact clear3.26 mg/LJan 2026880 served Mountain Village DevelopmentNatural background0.25 mg/LDec 202377 served Muldrow PwaNatural background0.12 mg/LMar 20253,104 served Mulhallpurchased waterHealth-study range8.57 mg/LJun 2026225 served Murray Co Rwd # 1Natural background0.74 mg/LMar 20264,800 served Murray State CollegeNatural background0.10 mg/LFeb 20261,150 served MuskogeeNatural background0.29 mg/LApr 202538,310 served Muskogee Co. Rwd #1 (Oktaha)purchased waterNatural background0.29 mg/LApr 20252,280 served Muskogee Co. Rwd #14purchased waterNatural background0.29 mg/LApr 202560 served Muskogee Co. Rwd #2 (Gooseneck)purchased waterNatural background0.29 mg/LApr 20251,000 served Muskogee Co. Rwd #3Natural background0.12 mg/LAug 20251,300 served Muskogee Co. Rwd #4purchased waterNatural background0.34 mg/LDec 2025783 served Muskogee Co. Rwd #5purchased waterNatural background0.29 mg/LApr 20254,135 served Muskogee Co. Rwd #6purchased waterNatural background0.29 mg/LApr 20252,550 served Muskogee Co. Rwd #7purchased waterNatural background0.34 mg/LDec 20251,710 served Muskogee Co. Rwd #9purchased waterNatural background0.29 mg/LApr 2025300 served MustangNatural background0.57 mg/LDec 202518,576 served

N

NashHuman impact likely2.06 mg/LDec 2025224 served New Cordell Utility AuthorityHealth-study range8.54 mg/LMay 20262,903 served New Life Ranch, Flint ValleyNatural background0.26 mg/LJan 202635 served NewcastleNatural background0.71 mg/LAug 20257,900 served NewkirkNatural background0.25 mg/LDec 20252,243 served Nichols HillsNatural background0.25 mg/LDec 20234,020 served Nicoma ParkHuman impact likely1.40 mg/LFeb 2024318 served Noble Co Rwd # 4purchased waterHuman impact likely2.24 mg/LDec 2025142 served Noble Co Rwd #1 (Lucien)purchased waterHealth-study range8.57 mg/LJun 2026335 served Noble Co Rwd #3Human impact likely1.22 mg/LDec 2025250 served Noble County Rwd #2purchased waterHuman impact likely1.26 mg/LJan 20262,100 served Noble Estates MhpHuman impact likely1.97 mg/LAug 202475 served Noble Utilities AuthorityHuman impact likely2.37 mg/LMar 20265,750 served Norge Water And Sewer Co., Incpurchased waterNatural background0.46 mg/LJan 2026890 served Norman Utilities AuthorityNatural background0.48 mg/LApr 2026104,868 served North Blaine Water CorpHealth-study range8.43 mg/LJun 2026960 served North Latta Park, LlcNatural background0.12 mg/LDec 202539 served North Miamipurchased waterNatural background0.33 mg/LApr 2026433 served North Vinita Water Coop Incpurchased waterNatural background0.23 mg/LOct 2025162 served Nowata Co Rw & S Dist #1purchased waterNatural background0.12 mg/LDec 2025500 served Nowata Co Rwd #2purchased waterNatural background0.12 mg/LJul 2025205 served Nowata Co Rwd #5purchased waterNatural background0.12 mg/LJul 202570 served Nowata Co Rwd #6purchased waterNatural background0.12 mg/LJul 2025450 served Nowata Co Rwd #7purchased waterNatural background0.53 mg/LApr 20251,050 served Nowata County Rwd # 3purchased waterNatural background0.12 mg/LJul 2025225 served Nowata Municipal AuthorityNatural background0.12 mg/LJul 20253,971 served

O

Oak Ridge Estates I & Ii Water Assoc.Natural background0.12 mg/LAug 202562 served Oakland Pwapurchased waterNatural background0.25 mg/LDec 20251,050 served Oaks Mobile Home Parkpurchased waterNatural background0.16 mg/LFeb 2026250 served Oakview Water CorpHealth-study range5.58 mg/LMay 2026925 served Ochelata Utility Authoritypurchased waterNatural background0.12 mg/LDec 2025494 served OiltonNatural background0.25 mg/LMar 20261,435 served OkarcheHealth-study range6.17 mg/LApr 20261,110 served Okarche Rwd, IncAbove the federal limit14.10 mg/LMay 2026250 served Okay Pwapurchased waterNatural background0.29 mg/LApr 2025767 served OkeeneNatural background0.70 mg/LMar 20261,240 served Okemah Utilities AuthorityNatural background0.25 mg/LFeb 20263,113 served Okfuskee Co. Rwd #1 (Boley)Human impact likely2.89 mg/LApr 20261,000 served Okfuskee Co. Rwd #2purchased waterNatural background0.25 mg/LFeb 20262,250 served Okfuskee Co. Rwd #3purchased waterNatural background0.25 mg/LFeb 20261,823 served Okla Christian UniversityNatural background0.05 mg/LSep 20251,800 served Okla Ordnance Works AuthorityNatural background0.30 mg/LNov 20254,000 served Oklahoma CityNatural background0.68 mg/LJan 2025644,000 served Oklahoma State Reformatorypurchased waterHealth-study range8.97 mg/LApr 2026999 served Oklahoma Universitypurchased waterNatural background0.48 mg/LApr 202634,000 served Okmulgee Co. Rwd #1purchased waterNatural background0.12 mg/LMay 20261,890 served Okmulgee Co. Rwd #2 (Preston)purchased waterNatural background0.12 mg/LMay 20262,355 served Okmulgee Co. Rwd #20purchased waterNatural background0.12 mg/LMay 20262,377 served Okmulgee Co. Rwd #21purchased waterNatural background0.21 mg/LJan 2026625 served Okmulgee Co. Rwd #4purchased waterNatural background0.12 mg/LMay 20261,913 served Okmulgee Co. Rwd #5 (Bryant)Human impact likely1.36 mg/LDec 2025750 served Okmulgee Co. Rwd #6 (Hectorville)purchased waterNatural background0.12 mg/LMay 20268,370 served Okmulgee Co. Rwd #7 (Nuyaka)purchased waterNatural background0.12 mg/LMay 20262,357 served Okmulgee PwaNatural background0.12 mg/LMay 202613,495 served Olustee Public Works Authoritypurchased waterNatural background0.25 mg/LApr 2025607 served OptimaHuman impact clear3.51 mg/LApr 2025400 served Orlandopurchased waterHealth-study range8.57 mg/LJun 2026201 served Osage Co Rwd # 1purchased waterNatural background0.12 mg/LDec 2025930 served Osage Co Rwd # 5purchased waterNatural background0.12 mg/LJan 2025561 served Osage Co Rwd #15purchased waterNatural background0.12 mg/LJan 20266,647 served Osage Co Rwd #18 (Evergreen)purchased waterNatural background0.12 mg/LFeb 2026302 served Osage Co Rwd #20 (Hulah)purchased waterNatural background0.37 mg/LDec 2024350 served Osage Co Rwd #21Human impact likely2.25 mg/LDec 20241,500 served Osage Co Rws & Swd #3 (Braden)purchased waterNatural background0.94 mg/LDec 2025700 served Osage PwaNatural background0.25 mg/LDec 2025275 served Osu Water PlantNatural background0.25 mg/LJan 202613,000 served Otoe-Missouria TribeHuman impact likely1.18 mg/LJan 2025250 served Ottawa Co Rwd # 1Natural background0.05 mg/LApr 2025458 served Ottawa Co Rwd # 2Natural background0.12 mg/LMar 2026700 served Ottawa Co Rwd # 4Natural background0.12 mg/LMar 2026652 served Ottawa Co Rwd #5Natural background0.05 mg/LApr 2025750 served Ottawa Co Rwd #6Natural background0.12 mg/LApr 2026560 served Ottawa Co Rwd #7Natural background0.12 mg/LApr 2026500 served Owassopurchased waterNatural background0.10 mg/LJan 202623,000 served Ozark Rural Water Incpurchased waterNatural background0.34 mg/LDec 202599 served

P

PadenHuman impact likely2.21 mg/LJan 2026446 served Panama Pwapurchased waterNatural background0.05 mg/LApr 20251,400 served Panhandle State UniversityHealth-study range5.12 mg/LJun 20261,200 served PaoliHuman impact clear3.23 mg/LFeb 2026610 served Pauls ValleyNatural background0.42 mg/LMar 20256,256 served PawhuskaNatural background0.12 mg/LFeb 20263,800 served PawneeNatural background0.40 mg/LMar 20262,230 served Pawnee Co Rwd #1Human impact likely1.57 mg/LOct 20243,200 served Pawnee Co Rwd #2Natural background0.05 mg/LAug 20241,775 served Pawnee Co Rwd #3purchased waterNatural background0.40 mg/LMar 2026685 served Pawnee Co Rwd #4purchased waterNatural background0.25 mg/LMay 2025415 served Pawnee County Rwd #5purchased waterNatural background0.57 mg/LSep 2024225 served Payne Co Rw Corp #3purchased waterHuman impact likely1.26 mg/LJan 20263,000 served Payne Co Rwd #3Human impact likely1.46 mg/LFeb 20251,400 served Payne Co Rwd #4purchased waterNatural background0.25 mg/LMay 2025820 served Pecan Tree Water AssnNatural background0.33 mg/LSep 202422 served Pecan Valley Rwdpurchased waterNatural background0.79 mg/LMar 20261,000 served Peggs Water CompanyNatural background0.90 mg/LJan 20261,925 served Peppers RanchHealth-study range8.87 mg/LDec 202599 served PerkinsHealth-study range6.60 mg/LDec 20252,572 served Perry Water & Light DeptNatural background0.25 mg/LApr 20255,230 served Pettit Mountain Waterpurchased waterNatural background0.78 mg/LFeb 202690 served Phillips Rwd #1purchased waterNatural background0.10 mg/LJan 2026140 served Piedmont Municipal AuthorityNatural background0.99 mg/LMar 20257,542 served Pine Country Living MhpNatural background0.52 mg/LOct 2025100 served PittsburgNatural background0.10 mg/LJan 2026280 served Pittsburg Co. Pwa (Crowder)Natural background0.10 mg/LJan 20262,203 served Pittsburg Co. Rwd #11 (Kiowa)purchased waterNatural background0.10 mg/LFeb 2026790 served Pittsburg Co. Rwd #14purchased waterNatural background0.26 mg/LDec 20251,680 served Pittsburg Co. Rwd #16purchased waterNatural background0.05 mg/LDec 20251,268 served Pittsburg Co. Rwd #20 (Carlton Landing)purchased waterNatural background0.10 mg/LJan 202638 served Pittsburg Co. Rwd #5purchased waterNatural background0.05 mg/LDec 20251,750 served Pittsburg Co. Rwd #6 (Alderson)purchased waterNatural background0.05 mg/LDec 2025300 served Pittsburg Co. Rwd #7 (Arpelar)purchased waterNatural background0.05 mg/LDec 20252,040 served Pittsburg Co. Rwd #9 (Mcalester)purchased waterNatural background0.05 mg/LDec 2025872 served Pittsburg Co. Water AuthorityNatural background0.26 mg/LDec 20255 served Ponca City Mun WaterNatural background0.94 mg/LDec 202527,155 served Pond CreekHuman impact likely2.84 mg/LDec 2025982 served Pontotoc Co Rwd # 1 (Homer)purchased waterNatural background0.79 mg/LJan 2026441 served Pontotoc Co Rwd # 6 (Fittstown)purchased waterNatural background0.79 mg/LJan 2026896 served Pontotoc Co Rwd # 7purchased waterNatural background0.79 mg/LJan 20264,863 served Pontotoc Co Rwd # 8Human impact likely2.72 mg/LFeb 20264,250 served Pontotoc Co Rwd # 9purchased waterNatural background0.79 mg/LJan 20261,162 served Porter Pwapurchased waterNatural background0.12 mg/LAug 20252,400 served Porum PwaNatural background0.18 mg/LDec 20255,000 served Poteau Pwapurchased waterNatural background0.05 mg/LApr 20257,939 served Poteau Valley Improvement AuthorityNatural background0.05 mg/LApr 202510 served Pottawatomie Co Development Authpurchased waterNatural background0.25 mg/LApr 20261,200 served Pottawatomie County Rwd #3Natural background0.10 mg/LJan 2026560 served Potters Trailer ParkHealth-study range6.77 mg/LDec 2025150 served PragueNatural background0.10 mg/LOct 20252,395 served Prairie Creek Village MhpNatural background0.40 mg/LAug 2025145 served Prue PwaHuman impact likely2.40 mg/LApr 2025387 served Pryorpurchased waterNatural background0.30 mg/LNov 20258,784 served PurcellNatural background0.25 mg/LJul 20256,693 served Pushmataha Co. Rwd #1purchased waterNatural background0.10 mg/LJan 20261,200 served Pushmataha Co. Rwd #2 (Albion)purchased waterNatural background0.10 mg/LJan 2026959 served Pushmataha Co. Rwd #3Natural background0.10 mg/LFeb 20264,825 served Pushmataha Co. Rwd #5 (Nashoba)purchased waterNatural background0.10 mg/LJan 2026725 served

Q

QuapawNatural background0.05 mg/LMar 2025906 served Quapaw TribeNatural background0.05 mg/LJun 202555 served Quartz Mountain Reg Water AuthHealth-study range8.97 mg/LApr 20265 served Quinlan Community Rwd #1Health-study range6.78 mg/LMar 2026185 served Quintonpurchased waterNatural background0.12 mg/LJan 20261,071 served

R

R&C Water Corppurchased waterHealth-study range7.22 mg/LMay 2026400 served RalstonNatural background0.57 mg/LSep 2024335 served Ramona Public Works Authoritypurchased waterNatural background0.12 mg/LDec 2025564 served Randlett Pwapurchased waterAbove the federal limit11.60 mg/LApr 2026320 served Ratliff CityNatural background0.10 mg/LMar 2025131 served RaviaNatural background0.93 mg/LMar 2025459 served Red Bird Pwapurchased waterNatural background0.12 mg/LAug 2025153 served Red Oak PwaNatural background0.27 mg/LFeb 2026581 served Red Rockpurchased waterHuman impact likely1.18 mg/LJan 2025293 served Red Wagon MhpHuman impact likely1.46 mg/LDec 202546 served Reed Water Corppurchased waterHealth-study range9.01 mg/LJun 2026175 served RinglingNatural background0.10 mg/LMar 20261,200 served RingwoodHealth-study range5.06 mg/LDec 2025424 served Ripley PwaHuman impact clear4.80 mg/LJan 2026376 served Riverbend Mhppurchased waterNatural background0.10 mg/LJan 2026500 served Rock CreekHuman impact likely1.75 mg/LOct 202433 served Rockypurchased waterAbove the federal limit10.20 mg/LApr 2026202 served RoffNatural background0.10 mg/LMar 2026800 served Roger Mills Rwd # 2 (Red Star)Health-study range6.70 mg/LFeb 2024800 served Roger Mills Rws & Swmd #1Health-study range8.07 mg/LDec 2024200 served Roger Mills Rws & Swmd #3 (Reydon)Human impact clear3.43 mg/LJun 2025177 served Rogers Co Rwd # 2purchased waterNatural background0.12 mg/LApr 20262,750 served Rogers Co Rwd # 3 Cot Stapurchased waterNatural background0.10 mg/LJan 202610,750 served Rogers Co Rwd # 3 Lake PlantNatural background0.12 mg/LDec 202510,470 served Rogers Co Rwd # 4Natural background0.12 mg/LMar 20257,725 served Rogers Co Rwd # 5Natural background0.12 mg/LSep 202511,782 served Rogers Co Rwd # 6purchased waterNatural background0.30 mg/LNov 20251,560 served Rogers Co Rwd # 7purchased waterNatural background0.30 mg/LNov 20253,040 served Rogers Co Rwd # 8purchased waterNatural background0.12 mg/LApr 20263,375 served Rogers Co Rwd # 9purchased waterNatural background0.30 mg/LNov 20251,037 served Rogers Co Rwd #12purchased waterNatural background0.10 mg/LJan 2026176 served RolandNatural background0.12 mg/LMar 20262,842 served Roosevelt PwaNatural background0.10 mg/LFeb 2025280 served Roundhill Rwd #4purchased waterNatural background0.10 mg/LJan 2026219 served Rush SpringsHuman impact clear3.98 mg/LFeb 20261,278 served Ryan Utilities Authoritypurchased waterNatural background0.25 mg/LDec 2025800 served

S

Salina Pwapurchased waterNatural background0.30 mg/LNov 20251,422 served SallisawNatural background0.57 mg/LJan 20268,510 served Salt Fork Water Authoritypurchased waterHealth-study range8.68 mg/LMay 202686 served Sand SpringsNatural background0.12 mg/LMar 202628,774 served SapulpaNatural background0.16 mg/LFeb 202619,702 served Sapulpa Rural Water Companypurchased waterNatural background0.16 mg/LFeb 20265,810 served Sardis Lake Water AuthorityNatural background0.10 mg/LJan 2026307 served Sasakwa PwaNatural background0.10 mg/LFeb 2026150 served Sasakwa RwdNatural background0.10 mg/LFeb 2026210 served Savannapurchased waterNatural background0.16 mg/LMay 2025800 served SayreHealth-study range7.35 mg/LFeb 20264,375 served SeilingHuman impact clear3.58 mg/LJun 2026860 served SeminoleNatural background0.10 mg/LMar 20266,899 served Seminole Co. Rw&Swmd #3purchased waterNatural background0.25 mg/LFeb 2026337 served Seminole Co. Rwd #1purchased waterNatural background0.39 mg/LJan 2026387 served Seminole Co. Rwd #2purchased waterNatural background0.39 mg/LJan 2026315 served Seminole Co. Rwd #7Natural background0.05 mg/LJun 2025450 served Seneca-Cayuga NationNatural background0.05 mg/LMar 2025400 served Sentinel Pwspurchased waterAbove the federal limit10.20 mg/LApr 2026859 served Sequoyah Co. Rwd #3purchased waterNatural background0.57 mg/LJan 20261,040 served Sequoyah Co. Rwd #4purchased waterNatural background0.57 mg/LJan 20261,750 served Sequoyah Co. Rwd #5purchased waterNatural background0.25 mg/LNov 20251,075 served Sequoyah Co. Rwd #5purchased waterNatural background0.12 mg/LSep 2025250 served Sequoyah Co. Rwd #8Natural background0.12 mg/LSep 202513,460 served Shady Acres Custer CountyHealth-study range9.04 mg/LApr 202540 served Sharon UtilitiesHuman impact clear3.64 mg/LAug 2025175 served ShattuckHuman impact clear4.05 mg/LApr 20251,200 served Shawnee Municipal AuthorityNatural background0.25 mg/LApr 202629,990 served Shell Creek Rwd #12, Mcintosh Co.Human impact clear3.18 mg/LMar 2025175 served Sherwood Forest Mobile EstatesNatural background0.18 mg/LDec 2025172 served ShidlerNatural background0.18 mg/LMar 2025404 served Skiatook PwaNatural background0.12 mg/LJan 20268,110 served Skyline MhpHuman impact clear3.42 mg/LAug 2025120 served Skyview Mobile Home ParkHuman impact clear3.90 mg/LNov 202424 served Slickpurchased waterHealth-study range5.58 mg/LDec 2025148 served Snyder Public Works AuthorityHuman impact likely2.54 mg/LJan 20251,509 served Sooner Utilities - Circle C EstatesHuman impact likely1.41 mg/LDec 2025155 served Sooner Utilities - Sleepy HollowHuman impact likely1.34 mg/LMar 2026438 served Sooner Utilities-Crosby #1Human impact likely1.55 mg/LDec 2025168 served Sooner Utilities-Crosby #2Human impact likely2.09 mg/LDec 2025385 served Sooner Utilities-CrutchoNatural background0.37 mg/LDec 202393 served Sooner Utilities-RobertsonHuman impact likely1.75 mg/LDec 202583 served Sooner Utilities-Tinker TownNatural background0.64 mg/LDec 2025603 served Sooner Utilities-Valley BrookNatural background0.37 mg/LDec 2025853 served SoperNatural background0.05 mg/LJan 2024300 served South Coffeyvillepurchased waterNatural background0.53 mg/LApr 2025790 served South Delaware Co Regional Water Auth.Human impact likely1.86 mg/LDec 20251,500 served Southeast Water Associationpurchased waterNatural background0.79 mg/LMar 202651 served Southern Hills EstatesHuman impact likely1.00 mg/LFeb 2026200 served Southern Okla Water CorpNatural background0.21 mg/LFeb 202611,250 served SpavinawNatural background0.10 mg/LSep 2025432 served SpencerNatural background0.67 mg/LMar 20263,746 served Sperrypurchased waterNatural background0.10 mg/LJan 20261,200 served SpiroNatural background0.30 mg/LNov 20242,200 served Spiro East Water Associationpurchased waterNatural background0.05 mg/LApr 20251,817 served Sportsmen Acrespurchased waterNatural background0.30 mg/LNov 2025218 served St. Louis RwdHuman impact likely2.07 mg/LOct 2024225 served Steelman EstatesNatural background0.05 mg/LSep 202545 served Stephens Co Rw&Sd #1Natural background0.10 mg/LFeb 2026960 served Stephens Co Rwd #3 (Meridian)Natural background0.64 mg/LFeb 20261,610 served Stephens Co Rwd #5Health-study range5.63 mg/LMay 20256,426 served Sterling PwaNatural background0.99 mg/LMar 2025762 served Stickross Mountain Water Copurchased waterHuman impact likely1.98 mg/LFeb 20263,250 served StiglerNatural background0.12 mg/LMar 20252,731 served Stillwater Utilities AuthorityHuman impact likely1.26 mg/LJan 202653,000 served StilwellNatural background0.72 mg/LJan 20263,276 served Stonebrook Utility CompanyNatural background0.05 mg/LMar 2024136 served Stonetown Clearview MhcNatural background0.40 mg/LFeb 2026170 served Stonewall PwaNatural background0.10 mg/LJan 2026465 served StratfordHuman impact likely2.51 mg/LApr 20261,575 served Strike Axe (Chimney Rock)purchased waterNatural background0.12 mg/LDec 2025275 served Strike-Axe Hwy 60purchased waterNatural background0.12 mg/LDec 2025450 served Strikeaxe Airportpurchased waterNatural background0.12 mg/LDec 2025125 served Stringtown Pwapurchased waterNatural background0.29 mg/LJan 20261,105 served Stroud Utilities AuthorityNatural background0.25 mg/LJan 20262,811 served Suburban MhpNatural background0.86 mg/LMar 202450 served SulphurNatural background0.10 mg/LMay 20264,929 served Summit Ridge Retirement Center, Inc.Human impact likely2.29 mg/LSep 2025200 served Sunnylane EstatesNatural background0.73 mg/LApr 2026300 served Sunnyside Water Assocpurchased waterNatural background0.79 mg/LMar 202650 served Sw Water Incpurchased waterHuman impact likely2.84 mg/LDec 2025200 served

T

Taftpurchased waterNatural background0.29 mg/LApr 2025250 served Tahlequah PwaHuman impact likely1.98 mg/LFeb 202614,458 served Talihina PwaNatural background0.10 mg/LJan 2026950 served TalogaHuman impact likely1.48 mg/LFeb 2026372 served Tecumseh Utility AuthorityNatural background0.25 mg/LJun 20266,098 served TempleNatural background0.25 mg/LDec 20251,146 served Tenkiller Waterworks, Inc.Natural background0.38 mg/LMar 2026860 served TerralHuman impact clear4.82 mg/LMay 2026386 served Texas County Rwd #1Human impact likely2.71 mg/LOct 2025135 served TexhomaHuman impact clear4.27 mg/LSep 2025935 served Texoma Hillspurchased waterNatural background0.17 mg/LMar 2026212 served ThackervilleNatural background0.10 mg/LFeb 20262,000 served Thirsty Water CorpAbove the federal limit12.70 mg/LFeb 202681 served ThomasNatural background0.10 mg/LJan 20261,238 served Tillman Co Rwd #1Above the federal limit11.50 mg/LApr 20261,500 served Timber Creek Mhp East & WestNatural background0.37 mg/LMar 202440 served Timberland MhcNatural background0.79 mg/LFeb 2026200 served Tinker Afb Family Housingpurchased waterNatural background0.45 mg/LMay 20262,100 served Tinker Air Force BaseNatural background0.45 mg/LMay 202624,645 served TiptonAbove the federal limit11.90 mg/LApr 2025916 served Tishomingo Municipal AuthorityNatural background0.10 mg/LFeb 20263,000 served Toland Acres MhpNatural background0.71 mg/LSep 202596 served TonkawaNatural background0.80 mg/LDec 20233,299 served Tri-County Rwd #2Natural background0.05 mg/LFeb 20255,172 served Tullahassee Waterpurchased waterNatural background0.12 mg/LAug 2025106 served TulsaNatural background0.10 mg/LJan 2026413,000 served Tulsa Co W Imp Dist #14purchased waterNatural background0.12 mg/LMar 20261,400 served Tupelo Pwapurchased waterNatural background0.79 mg/LJan 2026377 served TuttleHealth-study range7.09 mg/LJun 20264,500 served TyroneHuman impact clear3.78 mg/LDec 2025880 served

U

Union Citypurchased waterNatural background0.25 mg/LJun 2025618 served Us Army Ammunition PlantNatural background0.16 mg/LMay 20251,872 served

V

Valley Brook Mhppurchased waterNatural background0.16 mg/LFeb 2026114 served Valley View Estates Homeowners Assocpurchased waterNatural background0.79 mg/LMar 202642 served Valley View Water Associationpurchased waterNatural background0.79 mg/LMar 202625 served Valliant Pwapurchased waterNatural background0.10 mg/LFeb 2026971 served Vance Afbpurchased waterHealth-study range8.68 mg/LMay 20263,231 served VerdenHuman impact clear3.43 mg/LSep 2025659 served Vianpurchased waterNatural background0.12 mg/LSep 20251,445 served ViciHealth-study range8.61 mg/LFeb 2024668 served Vinita Utilities AuthorityNatural background0.23 mg/LOct 20256,472 served

W

WagonerNatural background0.43 mg/LMar 20257,982 served Wagoner Co. Rwd #1Natural background0.12 mg/LNov 2024397 served Wagoner Co. Rwd #2Natural background0.98 mg/LMay 20252,000 served Wagoner Co. Rwd #4Natural background0.33 mg/LDec 202525,792 served Wagoner Co. Rwd #5Natural background0.12 mg/LAug 20254,251 served Wagoner Co. Rwd #6purchased waterNatural background0.43 mg/LMar 20251,500 served Wagoner Co. Rwd #7 (New)Natural background0.30 mg/LDec 20251,110 served Wagoner Co. Rwd #9Natural background0.21 mg/LApr 20254,363 served WakitaHuman impact clear4.68 mg/LMar 2025344 served Walters Public Works AuthorityNatural background0.25 mg/LMar 20252,551 served Wanette Public Works Authoritypurchased waterNatural background0.10 mg/LJan 2026402 served WapanuckaNatural background0.41 mg/LApr 2026420 served WarnerNatural background0.12 mg/LJan 20252,020 served WashingtonHuman impact likely1.12 mg/LAug 2024600 served Washington Co Rwd #1purchased waterNatural background0.12 mg/LDec 20251,375 served Washington Co Rwd #2purchased waterNatural background0.12 mg/LDec 20252,250 served Washington Co Rwd #3 (New,#1)Natural background0.13 mg/LJul 202525,375 served Washington Co Rwd #5purchased waterNatural background0.12 mg/LDec 2025900 served Washington Co Rwd #7purchased waterNatural background0.37 mg/LDec 2024258 served Washita Co Rwd #2Health-study range6.08 mg/LMay 20261,032 served Water Improvement District #3purchased waterNatural background0.10 mg/LJan 20262,475 served WatongaHealth-study range9.51 mg/LMar 20262,816 served Waukomis PwaHealth-study range5.47 mg/LDec 20251,366 served Waurika Public Works AuthorityNatural background0.25 mg/LDec 20252,100 served WayneNatural background0.10 mg/LFeb 2026688 served WaynokaHealth-study range7.28 mg/LMay 2026993 served WeatherfordHealth-study range5.60 mg/LFeb 202610,833 served Welch PwaNatural background0.12 mg/LSep 2025800 served Weleetka Public Works AuthorityNatural background0.10 mg/LJan 2026998 served WellstonNatural background0.25 mg/LDec 2025825 served West Davis RwdNatural background0.10 mg/LJun 2026500 served Western Carter Co Water CorpNatural background0.10 mg/LJan 20262,000 served Westport Utility Authority TrustHuman impact likely1.08 mg/LJul 2025289 served WetumkaNatural background0.10 mg/LJan 20261,451 served Wewoka Public Works AuthorityNatural background0.39 mg/LJan 20263,450 served Whippoorwill EstatesNatural background0.71 mg/LFeb 202583 served Whispering OaksNatural background0.89 mg/LAug 2025350 served WilburtonNatural background0.12 mg/LFeb 20263,025 served Wildfire Estates HomeownersNatural background0.30 mg/LMay 2026285 served WillowHealth-study range7.70 mg/LJun 2026114 served Willow Creek MhpHuman impact likely1.88 mg/LSep 202599 served Wilson Municipal AuthorityNatural background0.10 mg/LFeb 20261,600 served Winter Creek Water Company, LlcNatural background0.96 mg/LDec 202446 served Wisterpurchased waterNatural background0.05 mg/LApr 20251,002 served Woods Co Rwd #2purchased waterHealth-study range6.10 mg/LJan 202542 served Woods County Rwd # 1purchased waterHealth-study range8.30 mg/LApr 2026426 served Woods County Rwd # 3purchased waterHealth-study range7.28 mg/LMay 2026356 served WoodwardHealth-study range5.29 mg/LAug 202515,000 served Woodward Co Rwd #1Health-study range8.66 mg/LMay 2026315 served Woodward Co Rwd #2Health-study range8.99 mg/LMay 2026920 served Wright City Pwapurchased waterNatural background0.10 mg/LFeb 2026792 served Wyandotte Tribe of OklahomaNatural background0.05 mg/LAug 202551 served Wynnewood Water & LightNatural background0.31 mg/LFeb 20262,307 served WynonaNatural background0.12 mg/LApr 2026450 served

Y

Yalepurchased waterNatural background0.25 mg/LMay 20251,227 served YukonNatural background0.24 mg/LFeb 202622,498 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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