Hermiston, City Of
PWSID OR4100372 · Hermiston, Oregon · serves 20,000 people · groundwater source
F
Failing
PFAS test results (EPA UCMR 5)
| Contaminant | Result | Federal limit (MCL) | Sampled |
|---|---|---|---|
| PFOS | 12 ppt | 4 ppt | 6/10/2024 |
| PFHxS | 12 ppt | 10 ppt | 6/10/2024 |
| PFBS | 10 ppt | — | 6/20/2023 |
| PFHxS | 8.4 ppt | 10 ppt | 6/20/2023 |
| PFHxS | 8 ppt | 10 ppt | 6/20/2023 |
| PFOS | 7.8 ppt | 4 ppt | 6/20/2023 |
| PFBS | 7.5 ppt | — | 2/20/2024 |
| PFHxS | 7.5 ppt | 10 ppt | 2/20/2024 |
| PFHxS | 7.3 ppt | 10 ppt | 11/21/2023 |
| PFOS | 6 ppt | 4 ppt | 6/20/2023 |
| PFOS | 5.2 ppt | 4 ppt | 11/21/2023 |
| PFOS | 4.5 ppt | 4 ppt | 2/20/2024 |
| PFBS | 4.4 ppt | — | 6/10/2024 |
| PFPeA | 4.2 ppt | — | 6/20/2023 |
| PFHxA | 3.9 ppt | — | 6/20/2023 |
| PFBS | 3.4 ppt | — | 6/20/2023 |
| PFBS | 3 ppt | — | 11/21/2023 |
ppt = parts per trillion (ng/L). Rows highlighted red meet or exceed the 2024 federal limit.
Violation history
| Date | Violation | Type | Health-based | Status |
|---|---|---|---|---|
| 2025-02-01 | Revised Total Coliform Rule | MON | No | Resolved |
| 2023-07-01 | Nitrate | MR | No | Resolved |
| 2022-09-01 | COLIPHAGE | MR | No | Resolved |
| 2022-09-01 | COLIPHAGE | MR | No | Resolved |
| 2022-07-01 | COLIPHAGE | MR | No | Resolved |
| 2022-07-01 | COLIPHAGE | MR | No | Resolved |