City Of Stockton
PWSID CA3910012 · Stockton, California · serves 192,702 people · surface water source
F
Failing
PFAS test results (EPA UCMR 5)
| Contaminant | Result | Federal limit (MCL) | Sampled |
|---|---|---|---|
| PFOS | 28 ppt | 4 ppt | 12/2/2025 |
| PFOA | 6.7 ppt | 4 ppt | 12/2/2025 |
| PFBS | 6.2 ppt | — | 12/2/2025 |
| PFOS | 4.8 ppt | 4 ppt | 2/28/2023 |
| PFOS | 4.2 ppt | 4 ppt | 2/28/2023 |
ppt = parts per trillion (ng/L). Rows highlighted red meet or exceed the 2024 federal limit.
Violation history
| Date | Violation | Type | Health-based | Status |
|---|---|---|---|---|
| 2024-01-01 | Nitrate | MR | No | Resolved |
| 2023-04-01 | TTHM | MCL | Yes | Resolved |
| 2023-01-01 | TTHM | MCL | Yes | Resolved |