Is Holliston, Massachusetts tap water safe?
1 water system report serving Holliston. Your water depends on which one serves your address. Check your bill if unsure.
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Holliston Water Department
Serves 15,139 people · Groundwater · Full report →
No health-based violations in the last 5 years; 64 monitoring/reporting violations; 2 not yet resolved; PFOA/PFOS average above the 4 ppt federal limit: PFOS, PFOA; Lead 90th percentile below the action level (2025).