Is Nantucket, Massachusetts tap water safe?
2 water systems report serving Nantucket. Your water depends on which one serves your address. Check your bill if unsure.
B
Wannacomet Water Company
Serves 27,703 people · Groundwater · Full report →
No health-based violations in the last 5 years; 68 monitoring/reporting violations; 2 not yet resolved; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
B
Siasconset Water Department
Serves 3,000 people · Groundwater · Full report →
No health-based violations in the last 5 years; 33 monitoring/reporting violations; 1 not yet resolved; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2025).