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State overview
Radon in Wisconsin
Of Wisconsin's 72 counties and county equivalents, EPA places 28 in Zone 1, 44 in Zone 2. Zones are county-wide predictions; testing is the only way to know your home's level.
Radon in the news
Wisconsin stories
- Wisconsin health experts encourage radon testing during winter monthsSpectrum News · 2026-01-23
- Northeast Wisconsin health officials urge home testing during Radon Action MonthWLUK · 2026-01-07
- Wisconsin health officials are urging residents to test their homes for cancer-causing radonMilwaukee Journal Sentinel · 2025-01-15
- High levels of radon found in northeast Wisconsin tribal homesWBAY · 2024-10-06
- Wisconsin health officials urge testing homes for radonWBAY · 2024-01-04
Headlines link to the original publishers via Google News. Updated 2026-10-27.
All 72 counties
Source: EPA radon zones spreadsheet (EPA 402/A-16/001).