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Counties with the Highest Radon Potential in Michigan

The top 25 of 83 Michigan counties on GIS Map, ranked by EPA radon zone, where zone 1 carries the highest predicted indoor radon potential and zone 3 the lowest.

#CountyEPA radon zone
1Allegan County
3
2Arenac County
3
3Bay County
3
4Benzie County
3
5Berrien County
3
6Cheboygan County
3
7Chippewa County
3
8Clare County
3
9Crawford County
3
10Delta County
3
11Gladwin County
3
12Grand Traverse County
3
13Gratiot County
3
14Huron County
3
15Iosco County
3
16Isabella County
3
17Kalkaska County
3
18Lake County
3
19Luce County
3
20Mackinac County
3
21Macomb County
3
22Manistee County
3
23Mason County
3
24Mecosta County
3
25Midland County
3

Source: EPA Map of Radon Zones (September 2025). All counties with data are ranked. Estimates carry margins of error.

Citing this page: GIS Map, “Counties with the Highest Radon Potential in Michigan”, https://gismap.land/rankings/michigan/highest-radon-counties. Figures from EPA Map of Radon Zones (September 2025).

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