PFAS · Oklahoma
PFAS in Oklahoma drinking water: EPA’s final survey results
EPA’s national PFAS survey (UCMR 5) tested 166 of the community water systems that serve homes in Oklahoma. 68 found at least one of 29 PFAS above the laboratory reporting level, and 9 had a PFOA or PFOS sampling-location yearly average at or above EPA’s 4.0 ppt limit. Samples were collected from January 2023 to March 2026.
Data as of EPA UCMR 5 final release, August 2026 (file dated Aug 28, 2026) · EPA SDWIS 2026Q2 (file dated Jul 9, 2026). How we build these pages
PFBA was the compound Oklahoma community systems found most often: 52 of 166 tested systems measured it above the reporting level. Across the country, 35% of surveyed community systems found at least one PFAS; in Oklahoma the share is 41%. The largest Oklahoma system with a detection, Oklahoma City, serves 644,000 people and found 1 of the 29 compounds.
Which PFAS were found most often in Oklahoma
Each row counts the Oklahoma community water systems where that compound was measured above the reporting level at least once. A detection is a measurement, not a violation: most of these compounds have no federal limit.
| Compound | Systems where found | Systems tested | Share |
|---|---|---|---|
| PFBA | 52 | 166 | 31% |
| PFPeA | 23 | 166 | 14% |
| PFHxA | 16 | 166 | 10% |
| PFHxS | 15 | 166 | 9% |
| PFBS | 14 | 166 | 8% |
| PFOS | 12 | 166 | 7% |
| PFOA | 2 | 166 | 1% |
| 6:2 FTS | 1 | 166 | 1% |
| 9Cl-PF3ONS | 1 | 166 | 1% |
| PFHpA | 1 | 166 | 1% |
Oklahoma systems with the most PFAS found
The 10 surveyed community water systems that found the most different PFAS, with PFOA and PFOS compared to EPA’s 4.0 ppt limits on the yearly average at the highest sampling location. Larger systems come first when counts tie.
| Water system | People served | PFAS found (of 29) | PFOA | PFOS |
|---|---|---|---|---|
| Broken Arrow Municipal Authority OK1021508 | 116,330 | 6 | — not detected above the reporting level | 17.0 ppt at or above the MCL |
| Edmond Pwa OK1020723 | 79,408 | 6 | — not detected above the reporting level | 4.03 ppt at or above the MCL |
| Wagoner Co. Rwd #5 OK1021528 | 4,251 | 6 | — not detected above the reporting level | 15.3 ppt at or above the MCL |
| Stillwater Utilities Authority OK1021220 | 53,000 | 5 | — not detected above the reporting level | 6.1 ppt at or above the MCL |
| Wagoner Co. Rwd #4 OK1021529 | 25,792 | 5 | — not detected above the reporting level | 16.8 ppt at or above the MCL |
| Logan Co Rwd #1 OK2004207 | 8,907 | 5 | 2.1 ppt below the MCL | — not detected above the reporting level |
| Ponca City Mun Water OK1021202 | 27,155 | 4 | — not detected above the reporting level | 6.8 ppt at or above the MCL |
| Duncan Public Utilities Authority OK1010809 | 23,000 | 4 | — not detected above the reporting level | — not detected above the reporting level |
| Bethany OK2005519 | 20,307 | 4 | 3.6 ppt below the MCL | 3.6 ppt below the MCL |
| Southern Okla Water Corp OK1010830 | 11,250 | 4 | — not detected above the reporting level | — not detected above the reporting level |
Counties with the most systems that found PFAS
- Oklahoma County 5 of 12 surveyed systems
- Pittsburg County 4 of 5 surveyed systems
- Creek County 3 of 7 surveyed systems
- Wagoner County 3 of 6 surveyed systems
- Pottawatomie County 3 of 3 surveyed systems
- Le Flore County 3 of 5 surveyed systems
- Washington County 3 of 3 surveyed systems
- Mayes County 3 of 6 surveyed systems