Is Jefferson, Wisconsin tap water safe?
1 water system report serving Jefferson. Your water depends on which one serves your address. Check your bill if unsure.
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Jefferson Waterworks
Serves 7,926 people · Groundwater · Full report →
7 health-based violations in the last 5 years; 1 monitoring/reporting violation; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2024).