Colchester Sewer & Water Commission
PWSID CT0280011 · Colchester, Connecticut · serves 4,020 people · groundwater source
F
Failing
PFAS test results (EPA UCMR 5)
| Contaminant | Result | Federal limit (MCL) | Sampled |
|---|---|---|---|
| PFOS | 9 ppt | 4 ppt | 9/11/2023 |
| PFOS | 8.8 ppt | 4 ppt | 9/11/2023 |
| PFOS | 7.2 ppt | 4 ppt | 3/7/2023 |
| PFOS | 7.2 ppt | 4 ppt | 3/7/2023 |
| PFHxS | 3.6 ppt | 10 ppt | 9/11/2023 |
| PFHxS | 3.3 ppt | 10 ppt | 3/7/2023 |
| PFHxS | 3.3 ppt | 10 ppt | 9/11/2023 |
| PFHxS | 3 ppt | 10 ppt | 3/7/2023 |
ppt = parts per trillion (ng/L). Rows highlighted red meet or exceed the 2024 federal limit.
Violation history
| Date | Violation | Type | Health-based | Status |
|---|---|---|---|---|
| 2026-03-01 | E. COLI | MR | No | Archived |
| 2025-08-10 | Consumer Confidence Rule | Other | No | Resolved |
| 2025-07-01 | Consumer Confidence Rule | Other | No | Resolved |
| 2025-06-15 | Public Notice | Other | No | Resolved |
| 2025-06-15 | Public Notice | Other | No | Resolved |
| 2024-05-25 | Public Notice | Other | No | Resolved |
| 2024-03-01 | E. COLI | MR | No | Resolved |
| 2024-01-01 | E. COLI | MR | No | Resolved |
| 2024-01-01 | TTHM | MR | No | Resolved |
| 2024-01-01 | Total Haloacetic Acids (HAA5) | MR | No | Resolved |
| 2023-07-01 | Consumer Confidence Rule | Other | No | Resolved |
| 2022-10-01 | Chlorine | MR | No | Resolved |