Castle Rock Town Of
PWSID CO0118010 · Castle Rock, Colorado · serves 110,298 people · surface water source
C
Fair
PFAS test results (EPA UCMR 5)
| Contaminant | Result | Federal limit (MCL) | Sampled |
|---|---|---|---|
| PFBA | 5.1 ppt | — | 8/28/2023 |
| PFPeA | 4.7 ppt | — | 8/28/2023 |
| PFPeA | 3 ppt | — | 2/21/2024 |
ppt = parts per trillion (ng/L). Rows highlighted red meet or exceed the 2024 federal limit.
Violation history
| Date | Violation | Type | Health-based | Status |
|---|---|---|---|---|
| 2025-06-01 | Surface Water Treatment Rule | MR | No | Resolved |
| 2025-05-01 | Surface Water Treatment Rule | MR | No | Resolved |
| 2022-04-01 | Gross Alpha, Excl. Radon and U | MR | No | Resolved |
| 2022-04-01 | Gross Alpha, Excl. Radon and U | MR | No | Resolved |
| 2022-04-01 | Combined Uranium | MR | No | Resolved |
| 2022-04-01 | Combined Uranium | MR | No | Resolved |
| 2022-04-01 | Combined Radium (-226 and -228) | MR | No | Resolved |
| 2022-04-01 | Combined Radium (-226 and -228) | MR | No | Resolved |