St Charles County Pwsd 2
PWSID MO6024530 · O'fallon, Missouri · serves 100,587 people · surface water source
B
Good
PFAS test results (EPA UCMR 5)
| Contaminant | Result | Federal limit (MCL) | Sampled |
|---|---|---|---|
| PFBA | 6.5 ppt | — | 4/9/2024 |
| PFBA | 5.2 ppt | — | 4/9/2024 |
ppt = parts per trillion (ng/L). Rows highlighted red meet or exceed the 2024 federal limit.
Violation history
| Date | Violation | Type | Health-based | Status |
|---|---|---|---|---|
| 2025-06-01 | Groundwater Rule | MR | No | Resolved |