Michigan Indoor Radon Results

EGLE created this map to show the radon information for first time tests, without active radon mitigation systems, by zip code. This map is based on results from the supplier that manufactures and analyzes short-term radon test kits purchased through the EGLE radon program. When sufficient data are available; the map will display minimum and maximum radon levels; total number of tests, mean and median values; the number of test results below a level of concern (2 picocuries per liter, pCi/L), in the recommended retest range (2 – 4 pCi/gL) and the recommended mitigation level (greater than 4 pCi/L); percentage of tests greater than 2 pCi/L; and percentage of tests greater than 4 pCi/L. The data set is updated approximately every quarter with the preceding 10 years’ worth of test results.