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Counties with the Highest Radon Potential in Minnesota

The top 25 of 87 Minnesota 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
1Aitkin County
2
2Anoka County
2
3Beltrami County
2
4Benton County
2
5Carlton County
2
6Cass County
2
7Chisago County
2
8Clearwater County
2
9Cook County
2
10Crow Wing County
2
11Isanti County
2
12Itasca County
2
13Koochiching County
2
14Lake County
2
15Lake of the Woods County
2
16Mille Lacs County
2
17Morrison County
2
18Pine County
2
19St. Louis County
2
20Becker County
1
21Big Stone County
1
22Blue Earth County
1
23Brown County
1
24Carver County
1
25Chippewa County
1

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 Minnesota”, https://gismap.land/rankings/minnesota/highest-radon-counties. Figures from EPA Map of Radon Zones (September 2025).

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