Oklahoma Water Quality
According to EPA Safe Drinking Water Information System (SDWIS), Oklahoma has 882 active community water systems in this extract. PlainEnviro's health-based slice lists 29,177 violation records across 50 systems with at least one such row. These are historical EPA registry counts, not a statewide drinkability score.
Health-based violation records for 882 community water systems in Oklahoma. Source: EPA Safe Drinking Water Information System (SDWIS).
Water Systems with Most Health-Based Records
| # | Water System | Health-Based Records | Health |
|---|---|---|---|
| 1 | HOMINY Hominy | 584 | Yes |
| 2 | MAYSVILLE Maysville | 407 | Yes |
| 3 | BARNSDALL Barnsdall | 390 | Yes |
| 4 | WEWOKA PUBLIC WORKS AUTHORITY Wewoka | 385 | Yes |
| 5 | SARDIS LAKE WATER AUTHORITY Clayton | 367 | Yes |
| 6 | CLEVELAND MUNICIPAL AUTHORITY Cleveland | 342 | Yes |
| 7 | FAIRFAX Fairfax | 313 | Yes |
| 8 | RYAN UTILITIES AUTHORITY Ryan | 303 | Yes |
| 9 | WAURIKA PUBLIC WORKS AUTHORITY Waurika | 281 | Yes |
| 10 | BEGGS Beggs | 279 | Yes |
| 11 | GRANDFIELD Grandfield | 264 | Yes |
| 12 | OSAGE CO RWD #20 (HULAH) Bartlesville | 247 | Yes |
| 13 | CHOCTAW CO. RWSG & SWMD #6 Boswell | 239 | Yes |
| 14 | PUSHMATAHA CO. RWD #3 Antlers | 238 | Yes |
| 15 | EUFAULA PWA Eufaula | 237 | Yes |
| 16 | PITTSBURG CO. RWD #14 Mcalester | 229 | Yes |
| 17 | WAGONER CO. RWD #2 Wagoner | 213 | Yes |
| 18 | BOSWELL PUBLIC WORKS AUTHORITY Boswell | 211 | Yes |
| 19 | MUSKOGEE CO. RWD #3 Council Hill | 210 | Yes |
| 20 | STRINGTOWN PWA Stringtown | 206 | Yes |
| 21 | IDABEL PWA Idabel | 199 | Yes |
| 22 | MUSKOGEE CO. RWD #5 Muskogee | 197 | Yes |
| 23 | ASHER UTIL DEV AUTH Asher | 197 | Yes |
| 24 | COWETA PWA Coweta | 192 | Yes |
| 25 | SHIDLER Shidler | 189 | Yes |
| 26 | SOUTHERN OKLA WATER CORP Ardmore | 188 | Yes |
| 27 | PITTSBURG Pittsburg | 185 | Yes |
| 28 | SPIRO EAST WATER ASSOCIATION Spiro | 184 | Yes |
| 29 | MCCURTAIN MUNICIPAL AUTHORITY Mccurtain | 183 | Yes |
| 30 | OKMULGEE CO. RWD #2 (PRESTON) Preston | 181 | Yes |
| 31 | HASKELL PWA-SWP Haskell | 179 | Yes |
| 32 | PECAN TREE WATER ASSN Noble | 176 | Yes |
| 33 | MAJOR COUNTY RWD #1 Fairview | 176 | Yes |
| 34 | GRAYHORSE RWD Fairfax | 171 | Yes |
| 35 | WANETTE PUBLIC WORKS AUTHORITY Wanette | 171 | Yes |
| 36 | COMANCHE PUBLIC WORKS AUTHORITY Comanche | 170 | Yes |
| 37 | PAYNE CO RWD #4 Yale | 166 | Yes |
| 38 | HUGO MUNICIPAL AUTHORITY Hugo | 165 | Yes |
| 39 | ELM BEND RWD INC Nowata | 160 | Yes |
| 40 | ADAMSON RWD #8 Hartshorne | 160 | Yes |
| 41 | MCALESTER PWA Mcalester | 156 | Yes |
| 42 | TALIHINA PWA Talihina | 154 | Yes |
| 43 | EAKLY DEVELOPMENT CORP Eakly | 154 | Yes |
| 44 | HOLDENVILLE Holdenville | 152 | Yes |
| 45 | OSAGE CO RWD # 5 Barnsdall | 152 | Yes |
| 46 | ATOKA CO. RWS & SWMD #4 Atoka | 150 | Yes |
| 47 | AVANT UTILITIES AUTHORITY Avant | 149 | Yes |
| 48 | MCINTOSH CO. RWD #5 Checotah | 147 | Yes |
| 49 | PAWNEE Pawnee | 145 | Yes |
| 50 | OKARCHE RWD, INC Okarche | 145 | Yes |
Most Common Contaminants in Oklahoma
| Contaminant | Violations | Systems Affected |
|---|---|---|
| TTHM | 14,300 | 294 |
| Total Haloacetic Acids (HAA5) | 4,759 | 184 |
| CARBON, TOTAL | 1,631 | 78 |
| Coliform (Pre-TCR) | 1,511 | 455 |
| Nitrate-Nitrite | 1,433 | 51 |
| Interim Enhanced Surface Water Treatment Rule | 1,417 | 81 |
| Coliform (TCR) | 1,131 | 430 |
| Surface Water Treatment Rule | 809 | 73 |
| LEAD AND COPPER RULE REVISIONS | 474 | 470 |
| Arsenic | 359 | 13 |
| Nitrate | 333 | 53 |
| Combined Uranium | 232 | 10 |
| Gross Alpha, Excl. Radon and U | 161 | 17 |
| Long Term 2 Enhanced Surface Water Treatment Rule | 104 | 7 |
| Turbidity | 99 | 38 |
Cities with Water Quality Issues
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About This Data
Water quality data is from the EPA Safe Drinking Water Information System (SDWIS). Health-based violations include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations. Only community water systems (CWS) in Oklahoma are included.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.