Stillwater Utilities Authority
PWSID OK1021220 · Stillwater, Oklahoma · serves 53,000 people · surface water source
F
Failing
PFAS test results (EPA UCMR 5)
| Contaminant | Result | Federal limit (MCL) | Sampled |
|---|---|---|---|
| PFOS | 8.6 ppt | 4 ppt | 12/4/2023 |
| PFHxS | 6.4 ppt | 10 ppt | 12/4/2023 |
| PFOS | 6.3 ppt | 4 ppt | 9/3/2024 |
| PFHxA | 4.9 ppt | — | 12/4/2023 |
| PFOS | 4.9 ppt | 4 ppt | 3/18/2024 |
| PFOS | 4.7 ppt | 4 ppt | 6/3/2024 |
| PFPeA | 4.4 ppt | — | 12/4/2023 |
| PFHxS | 4.4 ppt | 10 ppt | 3/18/2024 |
| PFHxS | 4.1 ppt | 10 ppt | 9/3/2024 |
| PFHxS | 3.4 ppt | 10 ppt | 6/3/2024 |
| PFPeA | 3.2 ppt | — | 3/18/2024 |
| PFHxA | 3.2 ppt | — | 3/18/2024 |
| PFHxA | 3.2 ppt | — | 9/3/2024 |
| PFBS | 3 ppt | — | 12/4/2023 |
ppt = parts per trillion (ng/L). Rows highlighted red meet or exceed the 2024 federal limit.
Violation history
| Date | Violation | Type | Health-based | Status |
|---|---|---|---|---|
| 2023-02-01 | Surface Water Treatment Rule | TT | Yes | Resolved |
| 2023-02-01 | Surface Water Treatment Rule | TT | Yes | Resolved |
| 2022-10-01 | CARBON, TOTAL | TT | Yes | Resolved |
| 2022-07-01 | CARBON, TOTAL | TT | Yes | Resolved |
| 2022-01-01 | CARBON, TOTAL | TT | Yes | Resolved |