Westerly Water Department
PWSID RI1559512 · Westerly, Rhode Island · serves 35,298 people · groundwater source
F
Failing
PFAS test results (EPA UCMR 5)
| Contaminant | Result | Federal limit (MCL) | Sampled |
|---|---|---|---|
| PFBA | 10 ppt | — | 5/14/2025 |
| PFOA | 9 ppt | 4 ppt | 9/2/2025 |
| PFOS | 7 ppt | 4 ppt | 9/2/2025 |
| PFOA | 7 ppt | 4 ppt | 9/2/2025 |
| PFOA | 6 ppt | 4 ppt | 9/2/2025 |
| PFOA | 6 ppt | 4 ppt | 5/14/2025 |
| PFPeA | 6 ppt | — | 9/2/2025 |
| PFOA | 6 ppt | 4 ppt | 9/2/2025 |
| PFPeA | 6 ppt | — | 5/14/2025 |
| PFOS | 5 ppt | 4 ppt | 9/2/2025 |
| PFHxA | 5 ppt | — | 9/2/2025 |
| PFOS | 5 ppt | 4 ppt | 5/14/2025 |
| PFPeA | 5 ppt | — | 9/2/2025 |
| PFHxA | 5 ppt | — | 9/2/2025 |
| PFOA | 5 ppt | 4 ppt | 5/14/2025 |
| PFOA | 4 ppt | 4 ppt | 5/14/2025 |
| PFOS | 4 ppt | 4 ppt | 9/2/2025 |
| PFOS | 4 ppt | 4 ppt | 5/14/2025 |
| PFHxA | 4 ppt | — | 5/14/2025 |
| PFHxA | 3 ppt | — | 9/2/2025 |
| PFPeA | 3 ppt | — | 9/2/2025 |
| PFHxA | 3 ppt | — | 5/14/2025 |
| PFBS | 3 ppt | — | 5/14/2025 |
| PFHpA | 3 ppt | — | 9/2/2025 |
| PFBS | 3 ppt | — | 9/2/2025 |
| PFBS | 3 ppt | — | 5/14/2025 |
| PFBS | 3 ppt | — | 9/2/2025 |
| PFHxA | 3 ppt | — | 9/2/2025 |
ppt = parts per trillion (ng/L). Rows highlighted red meet or exceed the 2024 federal limit.
Violation history
| Date | Violation | Type | Health-based | Status |
|---|---|---|---|---|
| 2025-01-01 | Lead and Copper Rule | MR | No | Resolved |
| 2024-07-01 | 1,2,4-Trichlorobenzene | MR | No | Resolved |
| 2024-07-01 | cis-1,2-Dichloroethylene | MR | No | Resolved |
| 2024-07-01 | Xylenes, Total | MR | No | Resolved |
| 2024-07-01 | DICHLOROMETHANE | MR | No | Resolved |
| 2024-07-01 | o-Dichlorobenzene | MR | No | Resolved |
| 2024-07-01 | p-Dichlorobenzene | MR | No | Resolved |
| 2024-07-01 | Vinyl chloride | MR | No | Resolved |
| 2024-07-01 | 1,1-Dichloroethylene | MR | No | Resolved |
| 2024-07-01 | trans-1,2-Dichloroethylene | MR | No | Resolved |
| 2024-07-01 | 1,2-Dichloroethane | MR | No | Resolved |
| 2024-07-01 | 1,1,1-Trichloroethane | MR | No | Resolved |
| 2024-07-01 | Carbon tetrachloride | MR | No | Resolved |
| 2024-07-01 | 1,2-Dichloropropane | MR | No | Resolved |
| 2024-07-01 | Trichloroethylene | MR | No | Resolved |
| 2024-07-01 | 1,1,2-Trichloroethane | MR | No | Resolved |
| 2024-07-01 | Tetrachloroethylene | MR | No | Resolved |
| 2024-07-01 | CHLOROBENZENE | MR | No | Resolved |
| 2024-07-01 | Benzene | MR | No | Resolved |
| 2024-07-01 | Toluene | MR | No | Resolved |
| 2024-07-01 | Ethylbenzene | MR | No | Resolved |
| 2024-07-01 | Styrene | MR | No | Resolved |
| 2023-01-11 | Revised Total Coliform Rule | RPT | No | Resolved |
| 2022-12-12 | E. COLI | MR | No | Resolved |