Iowa has 98 counties, with 98 classified as EPA Zone 1 (highest risk). With an average radon level of 10.23 pCi/L, Iowa state testing data reveals significantly elevated risks across multiple counties. Testing is highly recommended.
Iowa is the 26th most expansive state in terms of area, and is also the 30th most populous. The state maintains a commendable radon program, and they have plenty of information listed on the official site. According to findings by the Iowa Radon Survey, Iowa has the largest percentage of homes well above the US EPA action level of 4pCi/L - a total of 71.6%.
Explore radon data organized by metro region, including average levels, hotspot cities, and local mitigation professionals.
Cities with the most user-submitted radon test data, ranked by number of submissions.
All 98 Iowa counties with their EPA radon zone classification and user-submitted average radon levels.
Browse radon data for individual cities across Iowa. Each city page includes user-submitted radon levels, local contractors, and mitigation resources.