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Counties with the Highest Radon Potential in Missouri

The top 25 of 114 Missouri 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
1Butler County
3
2Dunklin County
3
3Mississippi County
3
4New Madrid County
3
5Pemiscot County
3
6Scott County
3
7Stoddard County
3
8Adair County
2
9Audrain County
2
10Barry County
2
11Barton County
2
12Bates County
2
13Benton County
2
14Bollinger County
2
15Boone County
2
16Caldwell County
2
17Callaway County
2
18Camden County
2
19Cape Girardeau County
2
20Carroll County
2
21Carter County
2
22Cedar County
2
23Chariton County
2
24Christian County
2
25Clark County
2

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

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