Compliance record
Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.
| Violation | Type | Status | Period |
|---|---|---|---|
| MCL | Health-based | Resolved | 1999-01-01 → 1999-12-31 |
| MCL | Health-based | Resolved | 1999-01-01 → 1999-12-31 |
PFAS detected
Other contaminants detected
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Bromoform | 10.1 µg/L No EPA limit set
worst single sample: 17 µg/L | 223/224 | SYR4 | 2012–2019 |
| TTHM | 47.74 µg/L 60% of the EPA limit 80 µg/L
worst single sample: 55.2 µg/L | 223/224 | SYR4 | 2012–2019 |
| Dibromochloromethane | 16.8 µg/L No EPA limit set
worst single sample: 20.3 µg/L | 200/224 | SYR4 | 2012–2019 |
| Bromodichloromethane | 14.14 µg/L No EPA limit set
worst single sample: 16.5 µg/L | 165/224 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 15.195 µg/L 25% of the EPA limit 60 µg/L
worst single sample: 26.8 µg/L | 162/224 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 5.655 µg/L No EPA limit set
worst single sample: 7.8 µg/L | 150/224 | SYR4 | 2012–2019 |
| Chloroform | 13.2 µg/L No EPA limit set
worst single sample: 24 µg/L | 121/224 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 8.39 µg/L No EPA limit set
worst single sample: 17.4 µg/L | 103/224 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 5.93 µg/L No EPA limit set
worst single sample: 7.3 µg/L | 70/224 | SYR4 | 2012–2019 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 42/42 | LCR | 2022 |
| Tetrachloroethylene | 3.4 µg/L 68% of the EPA limit 5 µg/L
worst single sample: 3.8 µg/L | 41/90 | SYR4 | 2012–2019 |
| Trichloroethylene | 2.73 µg/L 55% of the EPA limit 5 µg/L
worst single sample: 3.2 µg/L | 39/90 | SYR4 | 2012–2019 |
| Nitrate | 3616 µg/L 36% of the EPA limit 10000 µg/L | 32/46 | SYR4 | 2012–2019 |
| Arsenic | 3.79 µg/L 38% of the EPA limit 10 µg/L
worst single sample: 3.9 µg/L | 23/30 | SYR4 | 2012–2019 |
| Lithium | 59 µg/L No EPA limit set | 16/20 | UCMR-5 | 2024 |
| Fluoride | 379.5 µg/L 9.5% of the EPA limit 4000 µg/L
worst single sample: 390 µg/L | 8/8 | SYR4 | 2012–2019 |
| Combined Uranium | 8.5973 µg/L 29% of the EPA limit 30 µg/L
worst single sample: 8.642 µg/L | 4/14 | SYR4 | 2012–2019 |
| Barium | 120 µg/L 6% of the EPA limit 2000 µg/L | 1/8 | SYR4 | 2012–2019 |
88 contaminants tested, none detected
Utility contact
Frequently asked questions about Norwalk - City, Water Dept.
Is Norwalk - City, Water Dept. tap water safe to drink?
EPA monitoring detected 23 contaminants in Norwalk - City, Water Dept.'s water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.
What contaminants were detected in Norwalk - City, Water Dept.'s water?
EPA monitoring detected Bromoform, TTHM, Dibromochloromethane, Bromodichloromethane, Total Haloacetic Acids (HAA5), and others. The full list with the level and data source for each is above.
How many people does Norwalk - City, Water Dept. serve?
Norwalk - City, Water Dept. reports serving 20,283 people in California, per its EPA record.
Has Norwalk - City, Water Dept. had any water quality violations?
The EPA has 2 violations on file for Norwalk - City, Water Dept., of which 2 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.