U.S. safety records, as the agencies wrote them. Independent.
Tap water

Oklahoma: drinking water systems

The 901 active community water systems in Oklahoma on EPA's record, serving 3,685,980 people (EPA's counts). Systems serving more than 500 people have their own page; find yours by name, city, county, ZIP code or PWS ID. EPA's file dated Oct. 23, 2026.

610

610 of 901 systems have a health-based violation on EPA's record since Oct. 23, 2023, serving 1,624,159 of the state's 3,685,980 people (44%); 46 are an EPA enforcement priority. EPA lists 101 as currently in violation (EPA's system file of Oct. 23, 2026).

Health-based violations, in EPA's words: “Violations of maximum contaminant levels (MCLs) or maximum residual disinfectant levels (MRDLs), which specify the highest concentrations of contaminants or disinfectants, respectively, allowed in drinking water; or of treatment technique (TT) rules, which specify required processes intended to reduce the amounts of contaminants in drinking water. MCLs, MRDLs, and treatment technique rules are all health-based drinking water standards.”

Find your water system

    Health-based violations since Oct. 23, 2023, by contaminant or rule

    TTHM2,838Total Haloacetic Acids (HAA5)993LEAD AND COPPER RULE REVISIONS481Nitrate-Nitrite422CARBON, TOTAL234Interim Enhanced Surface Water Treatment Rule176Surface Water Treatment Rule126Arsenic55

    Cities and counties EPA lists, A to Z

    The cities EPA lists as served by each system, with the number of systems that list each; a system for which EPA lists no city is under its county.

    Adair (county) 9Alfalfa (county) 9Atoka (county) 8Beckham (county) 9Blaine (county) 8Bryan (county) 13Caddo (county) 15Canadian (county) 13Carter (county) 8Cherokee (county) 24Choctaw (county) 9Cleveland (county) 15Comanche (county) 23Cotton (county) 5Craig (county) 10Creek (county) 16Custer (county) 11Delaware (county) 26Garfield (county) 21Garvin (county) 13Grady (county) 17Greer (county) 7Haskell (county) 4Hughes (county) 9Jackson (county) 11Jefferson (county) 6Johnston (county) 10Kay (county) 12Kingfisher (county) 8Kiowa (county) 9Latimer (county) 6Le Flore (county) 20Lincoln (county) 13Logan (county) 14Marshall (county) 8Mayes (county) 20McClain (county) 12McCurtain (county) 12McIntosh (county) 11Murray (county) 7Muskogee (county) 18Noble (county) 10Nowata (county) 12Okfuskee (county) 6Oklahoma (county) 40Okmulgee (county) 15Osage (county) 27Ottawa (county) 15Pawnee (county) 13Payne (county) 12Pittsburg (county) 22Pontotoc (county) 10Pottawatomie (county) 15Pushmataha (county) 7Roger Mills (county) 5Rogers (county) 15Seminole (county) 11Sequoyah (county) 14Stephens (county) 6Texas (county) 11Tillman (county) 7Tulsa (county) 15Wagoner (county) 13Washington (county) 11Washita (county) 10Woodward (county) 9

    Counties

    A page for each county EPA lists for three or more systems with a page of their own: the systems that serve it and how each stands on EPA's record.

    Adair County 9Alfalfa County 9Atoka County 8Beckham County 9Blaine County 8Bryan County 13Caddo County 15Canadian County 13Carter County 8Cherokee County 24Choctaw County 9Cleveland County 15Comanche County 23Cotton County 5Craig County 10Creek County 16Custer County 11Delaware County 26Garfield County 21Garvin County 13Grady County 17Greer County 7Haskell County 4Hughes County 9Jackson County 11Jefferson County 6Johnston County 10Kay County 12Kingfisher County 8Kiowa County 9Latimer County 6Le Flore County 20Lincoln County 13Logan County 14Marshall County 8Mayes County 20McClain County 12McCurtain County 13McIntosh County 11Murray County 7Muskogee County 18Noble County 10Nowata County 12Okfuskee County 6Oklahoma County 40Okmulgee County 15Osage County 27Ottawa County 15Pawnee County 13Payne County 12Pittsburg County 22Pontotoc County 10Pottawatomie County 15Pushmataha County 7Roger Mills County 5Rogers County 15Seminole County 11Sequoyah County 14Stephens County 6Texas County 11Tillman County 7Tulsa County 15Wagoner County 13Washington County 11Washita County 10Woodward County 9

    Systems with no city or county on EPA's record, A to Z (11)

    • Cherokee Kenwood Water District487 peoplePWS ID 062002156
    • Chickasaw Winstar Casino8,376 peoplePWS ID 062004336
    • Eastern Shawnee796 peoplePWS ID 061000101
    • Jones Academy290 peoplePWS ID 063006122
    • Kickapoo Housing Complex499 peoplePWS ID 062004183
    • Pawnee Tribal Complex485 peoplePWS ID 064026001
    • Ponca Tribe Of Oklahoma360 peoplePWS ID 063003614
    • Pottawatomie Co. Rwd #3 (dale Plant)5,780 peoplePWS ID 061020808
    • Sac & Fox Nation479 peoplePWS ID 062004108
    • Tonkawa Tribe Of Oklahoma400 peoplePWS ID 062005885
    • Wyandotte Nation1,886 peoplePWS ID 062005883
    Water systems with a page of their own, A to Z (533)

    From EPA's Safe Drinking Water Information System (SDWIS), through EPA ECHO's drinking water system download. Health-based violations from EPA Envirofacts, downloaded Nov. 2, 2026. EPA's file dated Oct. 23, 2026. EPA: “All compliance and enforcement data displayed on ECHO are current as of the last official quarterly refresh of the source data system, SDWIS, which may lag by three to six months.” These are records of violations, not a test of your tap water today: your water system's annual Consumer Confidence Report has its test results. Names and values are shown as EPA writes them. EPA ECHO drinking water search.