Lake Royale S/D
PWSID NC0235108 · Des Peres, Missouri · serves 5,890 people · surface water source
F
Failing
PFAS test results (EPA UCMR 5)
| Contaminant | Result | Federal limit (MCL) | Sampled |
|---|---|---|---|
| PFOS | 4.8 ppt | 4 ppt | 7/19/2023 |
| PFOS | 4.1 ppt | 4 ppt | 3/25/2024 |
ppt = parts per trillion (ng/L). Rows highlighted red meet or exceed the 2024 federal limit.
Violation history
| Date | Violation | Type | Health-based | Status |
|---|---|---|---|---|
| 2025-10-01 | Lead and Copper Rule | MR | No | Addressed |
| 2025-07-01 | TTHM | MR | No | Resolved |
| 2025-07-01 | Total Haloacetic Acids (HAA5) | MR | No | Resolved |
| 2024-10-01 | TTHM | MR | No | Resolved |
| 2024-10-01 | Total Haloacetic Acids (HAA5) | MR | No | Resolved |
| 2024-07-01 | TTHM | MR | No | Resolved |
| 2024-07-01 | Total Haloacetic Acids (HAA5) | MR | No | Resolved |
| 2024-07-01 | Consumer Confidence Rule | Other | No | Resolved |
| 2023-11-01 | Revised Total Coliform Rule | RPT | No | Addressed |
| 2022-12-11 | Revised Total Coliform Rule | RPT | No | Resolved |
| 2022-10-01 | Revised Total Coliform Rule | RPT | No | Resolved |
| 2022-03-01 | Total Haloacetic Acids (HAA5) | MR | No | Resolved |