Norwalk - City, Water Dept.
PWSID CA1910191 · Norwalk, California · serves 20,283 people · surface water source
D
Poor
PFAS test results (EPA UCMR 5)
| Contaminant | Result | Federal limit (MCL) | Sampled |
|---|---|---|---|
| PFOS | 26 ppt | 4 ppt | 8/26/2024 |
| PFOS | 24 ppt | 4 ppt | 2/27/2024 |
| PFOS | 22 ppt | 4 ppt | 8/26/2024 |
| PFOS | 20 ppt | 4 ppt | 2/27/2024 |
| PFHxS | 7.6 ppt | 10 ppt | 2/27/2024 |
| PFHxS | 7.3 ppt | 10 ppt | 8/26/2024 |
| PFHxS | 7.3 ppt | 10 ppt | 8/26/2024 |
| PFHxS | 7.1 ppt | 10 ppt | 2/27/2024 |
| PFBA | 5.6 ppt | — | 2/27/2024 |
| PFBA | 5.5 ppt | — | 8/26/2024 |
| PFOA | 5.2 ppt | 4 ppt | 2/27/2024 |
| PFOA | 5.1 ppt | 4 ppt | 8/26/2024 |
| PFOA | 4.9 ppt | 4 ppt | 8/26/2024 |
| PFOA | 4.7 ppt | 4 ppt | 2/27/2024 |
| PFPeA | 3.4 ppt | — | 8/26/2024 |
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 | Unaddressed |