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Counties with the Highest Radon Potential in South Dakota

The top 25 of 65 South Dakota 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
1Bennett County
2
2Butte County
2
3Custer County
2
4Dewey County
2
5Fall River County
2
6Gregory County
2
7Haakon County
2
8Harding County
2
9Jackson County
2
10Jones County
2
11Lawrence County
2
12Meade County
2
13Mellette County
2
14Pennington County
2
15Todd County
2
16Tripp County
2
17Ziebach County
2
18Aurora County
1
19Beadle County
1
20Bon Homme County
1
21Brookings County
1
22Brown County
1
23Brule County
1
24Buffalo County
1
25Campbell 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 South Dakota”, https://gismap.land/rankings/south-dakota/highest-radon-counties. Figures from EPA Map of Radon Zones (September 2025).

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