Charleston Water System (Sc1010001)
PWSID SC1010001 · Charleston, South Carolina · serves 278,771 people · surface water source
F
Failing
PFAS test results (EPA UCMR 5)
| Contaminant | Result | Federal limit (MCL) | Sampled |
|---|---|---|---|
| PFOS | 6.5 ppt | 4 ppt | 9/17/2025 |
| PFOS | 5.9 ppt | 4 ppt | 12/9/2025 |
| PFOS | 5.7 ppt | 4 ppt | 3/24/2025 |
| PFOS | 5.2 ppt | 4 ppt | 6/16/2025 |
| PFPeA | 5 ppt | — | 12/9/2025 |
| PFPeA | 4.7 ppt | — | 6/16/2025 |
| PFOA | 4.7 ppt | 4 ppt | 12/9/2025 |
| PFHxA | 4.6 ppt | — | 12/9/2025 |
| PFPeA | 4.4 ppt | — | 3/24/2025 |
| PFOA | 4.4 ppt | 4 ppt | 3/24/2025 |
| PFPeA | 4.4 ppt | — | 9/17/2025 |
| PFHxA | 4.3 ppt | — | 6/16/2025 |
| PFBS | 4.3 ppt | — | 12/9/2025 |
| PFOA | 4.1 ppt | 4 ppt | 6/16/2025 |
| PFOA | 4.1 ppt | 4 ppt | 9/17/2025 |
| PFHxA | 3.9 ppt | — | 9/17/2025 |
| PFHxA | 3.8 ppt | — | 3/24/2025 |
| PFBS | 3.8 ppt | — | 6/16/2025 |
| PFBS | 3.8 ppt | — | 9/17/2025 |
| PFBS | 3.7 ppt | — | 3/24/2025 |
ppt = parts per trillion (ng/L). Rows highlighted red meet or exceed the 2024 federal limit.
Violation history
| Date | Violation | Type | Health-based | Status |
|---|---|---|---|---|
| 2025-07-01 | Lead and Copper Rule | TT | Yes | Archived |
| 2025-01-01 | Lead and Copper Rule | TT | Yes | Archived |