Is Hannibal, Ohio tap water safe?
2 water systems report serving Hannibal. Your water depends on which one serves your address. Check your bill if unsure. This list is matched from the ZIP codes in this place, so it may include nearby systems.
B
Monroe Water Systems
Serves 4,334 people · Groundwater · Full report →
1 health-based violation in the last 5 years; 3 monitoring/reporting violations; 2 not yet resolved; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
A
Ohio and Lee Twp Water Authority
Serves 1,620 people · Groundwater · Full report →
No health-based violations in the last 5 years; 1 monitoring/reporting violation; 1 not yet resolved; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2025).