Cohasset Water Dept
PWSID MA4065000 · Cohasset, Massachusetts · serves 7,555 people · surface water source
F
Failing
PFAS test results (EPA UCMR 5)
| Contaminant | Result | Federal limit (MCL) | Sampled |
|---|---|---|---|
| PFBA | 7.3 ppt | — | 9/16/2025 |
| PFOA | 6.7 ppt | 4 ppt | 9/16/2025 |
| PFOA | 4.9 ppt | 4 ppt | 6/9/2025 |
| PFPeA | 4.6 ppt | — | 9/16/2025 |
| PFOA | 4.6 ppt | 4 ppt | 12/2/2025 |
| PFOS | 4.5 ppt | 4 ppt | 9/16/2025 |
| PFHxA | 4 ppt | — | 9/16/2025 |
ppt = parts per trillion (ng/L). Rows highlighted red meet or exceed the 2024 federal limit.
Violation history
| Date | Violation | Type | Health-based | Status |
|---|---|---|---|---|
| 2026-07-01 | TTHM | MCL | Yes | Addressed |
| 2026-04-01 | TTHM | MCL | Yes | Archived |
| 2026-01-01 | TTHM | MCL | Yes | Archived |
| 2025-10-01 | TTHM | MCL | Yes | Archived |
| 2025-07-01 | TTHM | MCL | Yes | Archived |
| 2022-07-01 | Consumer Confidence Rule | Other | No | Resolved |