Is Guilford, Connecticut tap water safe?
3 water systems report serving Guilford. Your water depends on which one serves your address. Check your bill if unsure.
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Ctwc - Shoreline Region-Guilford System
Serves 33,975 people · Surface water · Full report →
No health-based violations in the last 5 years; PFOA/PFOS average above the 4 ppt federal limit: PFOS, PFOA; Lead 90th percentile below the action level (2025).
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Quonnipaug Hills - Main System
Serves 564 people · Groundwater · Full report →
No health-based violations in the last 5 years; 1 monitoring/reporting violation; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2026).
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Quonnipaug Hills - Section I
Serves 27 people · Groundwater · Full report →
No health-based violations in the last 5 years; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2025).