Is Posen, Illinois tap water safe?
1 water system report serving Posen. Your water depends on which one serves your address. Check your bill if unsure.
A
Posen
Serves 5,331 people · Surface water · Full report →
No health-based violations in the last 5 years; 4 monitoring/reporting violations; 1 not yet resolved; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2026).