Wisconsin Tap Water Quality: Is It Safe to Drink?
2026 EPA water quality data for 0 community water systems serving residents in Wisconsin. Find your water system to see violations, PFAS results, lead testing, and a safety grade — free.
Wisconsin draws drinking water primarily from groundwater wells, with Lake Michigan serving Milwaukee and several other eastern cities. Naturally occurring radium in deep sandstone wells has caused widespread violations, particularly in Waukesha and other communities in the radium belt. Nitrate from dairy farming and manure spreading affects shallow wells in agricultural areas.
Find Your Water System in Wisconsin
Enter your ZIP code to see EPA violations, lead test results, PFAS data, and a safety grade for your water.
📊 Data from EPA’s SDWIS
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🔄 Updated quarterly
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🏛️ 0+ water systems in Wisconsin