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 | 2012-10-01 → 2012-10-31 |
| MCL | Health-based | Resolved | 2012-10-01 → 2012-10-31 |
| MCL | Health-based | Resolved | 2012-10-01 → 2012-10-31 |
| MCL | Health-based | Resolved | 2012-10-01 → 2012-10-31 |
| MR | Monitoring | Resolved | 2023-01-01 → 2025-12-31 |
| MR | Monitoring | Resolved | 2023-01-01 → 2025-12-31 |
| MR | Monitoring | Resolved | 2023-01-01 → 2025-12-31 |
| MR | Monitoring | Resolved | 2023-01-01 → 2025-12-31 |
| MR | Monitoring | Resolved | 2023-01-01 → 2025-12-31 |
| MR | Monitoring | Resolved | 2023-01-01 → 2025-12-31 |
PFAS detected
Other contaminants detected
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Bromodichloromethane | 17.1 µg/L No EPA limit set
worst single sample: 22.7 µg/L | 133/141 | SYR4 | 2012–2019 |
| Chloroform | 31.02 µg/L No EPA limit set
worst single sample: 40.6 µg/L | 133/141 | SYR4 | 2012–2019 |
| Dibromochloromethane | 9.2 µg/L No EPA limit set
worst single sample: 11.5 µg/L | 133/141 | SYR4 | 2012–2019 |
| TTHM | 55.86 µg/L 70% of the EPA limit 80 µg/L
worst single sample: 75.3 µg/L | 133/133 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 39.26 µg/L 65% of the EPA limit 60 µg/L
worst single sample: 54.6 µg/L | 105/133 | SYR4 | 2012–2019 |
| Copper | 435.2 µg/L 33% of the EPA limit 1300 µg/L
worst single sample: 1230 µg/L | 95/130 | SYR4 | 2012–2018 |
| Dichloroacetic Acid | 23.58 µg/L No EPA limit set
worst single sample: 28.8 µg/L | 93/133 | SYR4 | 2012–2019 |
| Bromoform | 1.854 µg/L No EPA limit set
worst single sample: 2.2 µg/L | 89/141 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 8.828 µg/L No EPA limit set
worst single sample: 13.9 µg/L | 87/133 | SYR4 | 2012–2019 |
| Lead | 18.7 µg/L 125% of the EPA limit, at the 95th percentile of samples — 15 µg/L
worst single sample: 427 µg/L | 55/122 | SYR4 | 2012–2018 |
| Dibromoacetic Acid | 8.104 µg/L No EPA limit set
worst single sample: 9.75 µg/L | 43/133 | SYR4 | 2012–2019 |
| Lead | 0.0044 mg/L 29% of the EPA limit 0.0150 mg/L | 34/34 | LCR | 2024 |
| Monobromoacetic Acid | 14.985 µg/L No EPA limit set
worst single sample: 15.3 µg/L | 8/133 | SYR4 | 2012–2019 |
| Monochloroacetic Acid | 32.755 µg/L No EPA limit set
worst single sample: 36.5 µg/L | 8/133 | SYR4 | 2012–2019 |
| Lithium | 33.1 µg/L No EPA limit set | 1/11 | UCMR-5 | 2025 |
22 contaminants tested, none detected
Utility contact
Frequently asked questions about Mahwah Water Department
Is Mahwah Water Department tap water safe to drink?
EPA monitoring detected 22 contaminants in Mahwah Water Department'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 Mahwah Water Department's water?
EPA monitoring detected Bromodichloromethane, Chloroform, Dibromochloromethane, TTHM, Total Haloacetic Acids (HAA5), and others. The full list with the level and data source for each is above.
How many people does Mahwah Water Department serve?
Mahwah Water Department reports serving 26,777 people in New Jersey, per its EPA record.
Has Mahwah Water Department had any water quality violations?
The EPA has 104 violations on file for Mahwah Water Department, of which 4 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.