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Counties with the Highest Radon Potential in Tennessee

The top 25 of 95 Tennessee 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
1Bledsoe County
3
2Campbell County
3
3Carroll County
3
4Crockett County
3
5Cumberland County
3
6Dyer County
3
7Fayette County
3
8Franklin County
3
9Gibson County
3
10Grundy County
3
11Hardeman County
3
12Haywood County
3
13Henry County
3
14Lake County
3
15Lauderdale County
3
16Maury County
3
17Morgan County
3
18Obion County
3
19Rhea County
3
20Scott County
3
21Sequatchie County
3
22Shelby County
3
23Tipton County
3
24Weakley County
3
25Benton 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 Tennessee”, https://gismap.land/rankings/tennessee/highest-radon-counties. Figures from EPA Map of Radon Zones (September 2025).

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