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 | Archived | 1985-12-06 → 1989-12-05 |
| MCL | Health-based | Archived | 1985-12-06 → 1989-12-05 |
| MCL | Health-based | Archived | 1985-12-06 → 1989-12-05 |
| MCL | Health-based | Archived | 1985-12-06 → 1989-12-05 |
| MCL | Health-based | Archived | 1985-12-06 → 1989-12-05 |
| MCL | Health-based | Archived | 1985-12-06 → 1989-12-05 |
| MCL | Health-based | Archived | 1985-12-06 → 1989-12-05 |
| RPT | Monitoring | Unaddressed | 2025-07-02 |
| RPT | Monitoring | Unaddressed | 2025-07-02 |
| Other | Monitoring | Unaddressed | 2025-07-01 |
Other contaminants detected
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Copper | 380 µg/L 29% of the EPA limit 1300 µg/L | 29/40 | SYR4 | 2014–2017 |
| Bromodichloromethane | 12.4 µg/L No EPA limit set | 17/17 | SYR4 | 2012–2019 |
| Chloroform | 27 µg/L No EPA limit set | 17/17 | SYR4 | 2012–2019 |
| Dibromochloromethane | 6.28 µg/L No EPA limit set | 17/17 | SYR4 | 2012–2019 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 17/17 | LCR | 2025 |
| TTHM | 45 µg/L 56% of the EPA limit 80 µg/L | 17/17 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 26 µg/L 43% of the EPA limit 60 µg/L | 17/17 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 13 µg/L No EPA limit set | 15/17 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 14.8 µg/L No EPA limit set | 14/17 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 2.1 µg/L No EPA limit set | 9/17 | SYR4 | 2012–2019 |
| Lead | 3.3 µg/L 22% of the EPA limit 15 µg/L | 7/40 | SYR4 | 2014–2017 |
| Monobromoacetic Acid | 1.92 µg/L No EPA limit set | 1/17 | SYR4 | 2012–2019 |
32 contaminants tested, none detected
Utility contact
Frequently asked questions about Willowbrook
Is Willowbrook tap water safe to drink?
EPA monitoring detected 12 contaminants in Willowbrook'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 Willowbrook's water?
EPA monitoring detected Copper, Bromodichloromethane, Chloroform, Dibromochloromethane, Lead, and others. The full list with the level and data source for each is above.
How many people does Willowbrook serve?
Willowbrook reports serving 9,000 people in Illinois, per its EPA record.
Has Willowbrook had any water quality violations?
The EPA has 32 violations on file for Willowbrook, of which 7 are health-based (a contaminant limit or required treatment was breached) and 3 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.