Is Winthrop, Massachusetts tap water safe?
1 water system report serving Winthrop. Your water depends on which one serves your address. Check your bill if unsure.
A
Winthrop Water Division, (MWRA)
Serves 19,316 people · Surface water · Full report →
No health-based violations in the last 5 years; 1 monitoring/reporting violation; 1 not yet resolved; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).