Calistoga, City Of
PWSID CA2810002 · Calistoga, California · serves 5,610 people · surface water source
F
Failing
PFAS test results (EPA UCMR 5)
| Contaminant | Result | Federal limit (MCL) | Sampled |
|---|---|---|---|
| PFOS | 12.2 ppt | 4 ppt | 6/4/2024 |
| PFOA | 6.4 ppt | 4 ppt | 6/4/2024 |
| PFPeA | 4.2 ppt | — | 6/4/2024 |
| PFHxA | 3.2 ppt | — | 6/4/2024 |
ppt = parts per trillion (ng/L). Rows highlighted red meet or exceed the 2024 federal limit.
Violation history
| Date | Violation | Type | Health-based | Status |
|---|---|---|---|---|
| 2025-10-31 | Lead and Copper Rule | MR | No | Unaddressed |
| 2025-06-01 | Lead and Copper Rule | MR | No | Unaddressed |
| 2023-07-01 | Total Haloacetic Acids (HAA5) | MCL | Yes | Resolved |
| 2023-04-01 | Total Haloacetic Acids (HAA5) | MCL | Yes | Resolved |
| 2023-01-01 | Total Haloacetic Acids (HAA5) | MCL | Yes | Resolved |