Mashantucket Pequot Water System
PWSID 010106001 · Mashantucket, Connecticut · serves 22,171 people · surface water source
D
Poor
PFAS test results (EPA UCMR 5)
| Contaminant | Result | Federal limit (MCL) | Sampled |
|---|---|---|---|
| PFPeA | 19.1 ppt | — | 5/13/2024 |
| PFPeA | 18.5 ppt | — | 2/7/2024 |
| PFPeA | 18.2 ppt | — | 9/27/2023 |
| PFHxA | 9.9 ppt | — | 2/7/2024 |
| PFHxA | 9.7 ppt | — | 5/13/2024 |
| PFHxA | 9.2 ppt | — | 9/27/2023 |
| PFOA | 7.4 ppt | 4 ppt | 9/27/2023 |
| PFOA | 7.1 ppt | 4 ppt | 2/7/2024 |
| PFOA | 6.6 ppt | 4 ppt | 5/13/2024 |
| PFBA | 6.5 ppt | — | 5/13/2024 |
| PFBA | 6.3 ppt | — | 9/27/2023 |
| PFBA | 6.2 ppt | — | 2/7/2024 |
| PFBS | 3.6 ppt | — | 9/27/2023 |
| PFPeA | 3.6 ppt | — | 10/10/2023 |
| PFHpA | 3.6 ppt | — | 2/7/2024 |
| PFBS | 3.6 ppt | — | 2/7/2024 |
| PFHpA | 3.5 ppt | — | 9/27/2023 |
| PFBS | 3.4 ppt | — | 5/13/2024 |
| PFHpA | 3.3 ppt | — | 5/13/2024 |
ppt = parts per trillion (ng/L). Rows highlighted red meet or exceed the 2024 federal limit.
Violation history
| Date | Violation | Type | Health-based | Status |
|---|---|---|---|---|
| 2025-07-01 | Consumer Confidence Rule | Other | No | Resolved |
| 2024-07-01 | Consumer Confidence Rule | Other | No | Resolved |