St Charles
PWSID IL0894830 · St. Charles, Illinois · serves 33,081 people · groundwater source
B
Good
PFAS test results (EPA UCMR 5)
| Contaminant | Result | Federal limit (MCL) | Sampled |
|---|---|---|---|
| PFPeA | 7.5 ppt | — | 2/5/2026 |
| PFBS | 6.2 ppt | — | 2/5/2026 |
| PFHxA | 5.3 ppt | — | 2/5/2026 |
| PFBS | 4.3 ppt | — | 8/26/2025 |
| PFBS | 3.1 ppt | — | 12/5/2024 |
ppt = parts per trillion (ng/L). Rows highlighted red meet or exceed the 2024 federal limit.
Violation history
| Date | Violation | Type | Health-based | Status |
|---|---|---|---|---|
| 2026-01-01 | Lead and Copper Rule | MR | No | Unaddressed |
| 2025-07-01 | Consumer Confidence Rule | Other | No | Unaddressed |