Is Williamsport, Pennsylvania tap water safe?
2 water systems report serving Williamsport. 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.
A
Williamsport Mun Water Auth
Serves 51,000 people · Surface water · Full report →
No health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
B
Collomsville Mutual Waterworks
Serves 250 people · Groundwater · Full report →
No health-based violations in the last 5 years; 40 monitoring/reporting violations; No UCMR 5 PFAS results on file; Latest lead 90th percentile on file is from 1996 (older than 5 years, not graded).