Is Oak Brook, Illinois tap water safe?
2 water systems report serving Oak Brook. Your water depends on which one serves your address. Check your bill if unsure.
A
Oak Brook
Serves 9,400 people · Surface water · Full report →
No health-based violations in the last 5 years; 3 monitoring/reporting violations; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
A
Aqua Illinois-Oak Brook
Serves 5,361 people · Surface water · Full report →
No health-based violations in the last 5 years; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2025).