Is Mount Vernon, Illinois tap water safe?
2 water systems report serving Mount Vernon. Your water depends on which one serves your address. Check your bill if unsure.
A
Mount Vernon
Serves 15,793 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
Oak Grove Village
Serves 385 people · Surface water · Full report →
No health-based violations in the last 5 years; 1 monitoring/reporting violation; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2025).