Testing · Wisconsin

How to test your tap water in Wisconsin

What's worth testing for in Wisconsin, based on the state's reported EPA findings, and how to reach a state-certified lab. For a step-by-step walkthrough, see the full testing guide.

977
community water systems in Wisconsin
22
systems reported PFAS above an EPA limit
116
systems with a lead action-level violation

What to prioritize in Wisconsin

Because Wisconsin's records flag PFAS and lead, start there — then add the standard panel below. These are system-level findings, so your own tap can differ in either direction.

PFASLeadNitrateArsenicTrihalomethanes (TTHMs)

Find a state-certified lab

Wisconsin certifies the laboratories allowed to run official drinking-water tests. Use the EPA directory to find a certified lab in Wisconsin, or call the hotline with questions about a contaminant or method.

Find your state's certified labs (EPA) ↗ EPA Safe Drinking Water Hotline: 800-426-4791

For results you'll act on — a filter purchase, a real-estate disclosure, or a health concern — a state-certified lab is the gold standard. Many Wisconsin counties also run free or low-cost well-testing programs; ask your local health department.

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Counts reflect reported EPA data for community water systems in Wisconsin — a snapshot, not a live measurement of your tap, and they don't cover private wells. PurityRadar doesn't sell tests or earn commissions. Confirm anything concerning with your utility or Wisconsin health department.