Thornton City Of
PWSID CO0101150 · Thornton, Colorado · serves 226,465 people · surface water source
F
Failing
PFAS test results (EPA UCMR 5)
| Contaminant | Result | Federal limit (MCL) | Sampled |
|---|---|---|---|
| PFHxA | 12.6 ppt | — | 2/14/2023 |
| PFPeA | 12.4 ppt | — | 2/14/2023 |
| PFBA | 10.4 ppt | — | 2/14/2023 |
| PFHxA | 10.4 ppt | — | 5/30/2023 |
| PFPeA | 10 ppt | — | 5/30/2023 |
| PFBA | 9.6 ppt | — | 6/14/2023 |
| PFPeA | 8.8 ppt | — | 6/14/2023 |
| PFBA | 8.7 ppt | — | 5/30/2023 |
| PFBA | 8.3 ppt | — | 5/30/2023 |
| PFPeA | 8.2 ppt | — | 5/30/2023 |
| PFBA | 8.1 ppt | — | 8/14/2023 |
| PFBS | 8.1 ppt | — | 2/14/2023 |
| PFHxA | 7.5 ppt | — | 6/14/2023 |
| PFPeA | 7.5 ppt | — | 8/14/2023 |
| PFOA | 7.1 ppt | 4 ppt | 2/14/2023 |
| PFBS | 7.1 ppt | — | 5/30/2023 |
| PFOA | 6.5 ppt | 4 ppt | 5/30/2023 |
| PFBA | 6 ppt | — | 11/27/2023 |
| PFHxS | 5.9 ppt | 10 ppt | 2/14/2023 |
| PFHxA | 5.8 ppt | — | 8/14/2023 |
| PFHxA | 5.6 ppt | — | 11/27/2023 |
| PFPeA | 5.5 ppt | — | 11/27/2023 |
| PFOS | 5 ppt | 4 ppt | 2/14/2023 |
| PFBS | 4.8 ppt | — | 6/14/2023 |
| PFHxA | 4.8 ppt | — | 5/30/2023 |
| PFOS | 4.5 ppt | 4 ppt | 5/30/2023 |
| PFHxS | 4.2 ppt | 10 ppt | 5/30/2023 |
| PFBS | 4.2 ppt | — | 11/27/2023 |
| PFHxA | 4.1 ppt | — | 8/14/2023 |
| PFPeA | 4.1 ppt | — | 8/14/2023 |
| PFHpA | 3.7 ppt | — | 2/14/2023 |
| PFBS | 3.6 ppt | — | 8/14/2023 |
| PFBS | 3.2 ppt | — | 5/30/2023 |
| PFHpA | 3.2 ppt | — | 5/30/2023 |
| PFBS | 3.1 ppt | — | 8/14/2023 |
ppt = parts per trillion (ng/L). Rows highlighted red meet or exceed the 2024 federal limit.
Violation history
| Date | Violation | Type | Health-based | Status |
|---|---|---|---|---|
| 2023-11-01 | Interim Enhanced Surface Water Treatment Rule | MR | No | Resolved |
| 2023-10-01 | Interim Enhanced Surface Water Treatment Rule | MR | No | Resolved |
| 2023-09-01 | Interim Enhanced Surface Water Treatment Rule | MR | No | Resolved |
| 2023-07-01 | Lead and Copper Rule | MR | No | Resolved |
| 2022-04-01 | Combined Radium (-226 and -228) | MR | No | Resolved |
| 2022-04-01 | Combined Uranium | MR | No | Resolved |
| 2022-04-01 | Gross Alpha, Excl. Radon and U | MR | No | Resolved |