Water quality by county
in Oklahoma
EPA sampled public water systems across Oklahoma for PFAS under its UCMR 5 programme. Of the 77 counties, 9 have a reading above a federal limit and 18 have not been sampled at all — which is not a clean result, only an absence of one. Each county below shows what was found, at what concentration, and at which utility.
| county | Population | Worst result | Compound |
|---|---|---|---|
| Tulsa County | 693,514 | 13× | PFOS · 51.3 ng/L |
| Wagoner County | 91,257 | 8.5× | PFOS · 34 ng/L |
| Kay County | 43,437 | 5.8× | PFOS · 23 ng/L |
| Mayes County | 40,144 | 4.4× | PFOS · 17.7 ng/L |
| Nowata County | 9,561 | 2.4× | PFOS · 9.4 ng/L |
| Pottawatomie County | 74,446 | 2.2× | PFHxS · 22 ng/L |
| Payne County | 84,199 | 2.1× | PFOS · 8.6 ng/L |
| Oklahoma County | 816,490 | 1.6× | PFOS · 6.4 ng/L |
| Logan County | 53,860 | 1.1× | PFOA · 4.3 ng/L |
| Cleveland County | 303,952 | under the limit | PFHxS · 7.1 ng/L |
| Jackson County | 24,541 | under the limit | PFHxS · 3.3 ng/L |
| Tillman County | 6,736 | under the limit | PFHxS · 3 ng/L |
| Adair County | 19,821 | not sampled | — |
| Alfalfa County | 5,712 | under the limit | — |
| Atoka County | 14,600 | not sampled | — |
| Beaver County | 5,025 | not sampled | — |
| Beckham County | 22,248 | under the limit | — |
| Blaine County | 8,573 | under the limit | — |
| Bryan County | 50,305 | under the limit | — |
| Caddo County | 26,337 | under the limit | — |
| Canadian County | 181,760 | under the limit | — |
| Carter County | 49,135 | under the limit | — |
| Cherokee County | 48,729 | under the limit | — |
| Choctaw County | 14,174 | under the limit | — |
| Cimarron County | 2,133 | not sampled | — |
| Coal County | 5,414 | not sampled | — |
| Comanche County | 121,396 | under the limit | — |
| Cotton County | 5,503 | under the limit | — |
| Craig County | 14,506 | under the limit | — |
| Creek County | 73,971 | under the limit | — |
| Custer County | 28,266 | under the limit | — |
| Delaware County | 41,771 | under the limit | — |
| Dewey County | 4,268 | under the limit | — |
| Ellis County | 3,601 | not sampled | — |
| Garfield County | 62,007 | under the limit | — |
| Garvin County | 26,149 | under the limit | — |
| Grady County | 58,353 | under the limit | — |
| Grant County | 4,123 | not sampled | — |
| Greer County | 5,433 | not sampled | — |
| Harmon County | 2,315 | not sampled | — |
| Harper County | 3,209 | not sampled | — |
| Haskell County | 11,811 | not sampled | — |
| Hughes County | 13,371 | under the limit | — |
| Jefferson County | 5,374 | under the limit | — |
| Johnston County | 10,293 | not sampled | — |
| Kingfisher County | 15,820 | under the limit | — |
| Kiowa County | 8,257 | under the limit | — |
| Latimer County | 9,509 | not sampled | — |
| Le Flore County | 49,854 | under the limit | — |
| Lincoln County | 34,972 | not sampled | — |
| Love County | 10,423 | not sampled | — |
| Major County | 7,569 | not sampled | — |
| Marshall County | 16,147 | under the limit | — |
| McClain County | 48,434 | under the limit | — |
| McCurtain County | 30,805 | under the limit | — |
| McIntosh County | 19,710 | under the limit | — |
| Murray County | 13,754 | under the limit | — |
| Muskogee County | 66,752 | under the limit | — |
| Noble County | 10,896 | under the limit | — |
| Okfuskee County | 11,364 | under the limit | — |
| Okmulgee County | 37,084 | under the limit | — |
| Osage County | 46,495 | under the limit | — |
| Ottawa County | 30,404 | under the limit | — |
| Pawnee County | 16,111 | under the limit | — |
| Pittsburg County | 43,395 | under the limit | — |
| Pontotoc County | 38,310 | under the limit | — |
| Pushmataha County | 10,800 | under the limit | — |
| Roger Mills County | 3,304 | not sampled | — |
| Rogers County | 101,371 | under the limit | — |
| Seminole County | 23,351 | under the limit | — |
| Sequoyah County | 40,555 | under the limit | — |
| Stephens County | 44,075 | under the limit | — |
| Texas County | 20,577 | under the limit | — |
| Washington County | 54,060 | under the limit | — |
| Washita County | 10,839 | not sampled | — |
| Woods County | 8,582 | under the limit | — |
| Woodward County | 19,991 | under the limit | — |