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Counties with the Highest Radon Potential in South Carolina

The top 25 of 46 South Carolina 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
1Aiken County
3
2Allendale County
3
3Bamberg County
3
4Barnwell County
3
5Beaufort County
3
6Berkeley County
3
7Calhoun County
3
8Charleston County
3
9Chester County
3
10Chesterfield County
3
11Clarendon County
3
12Colleton County
3
13Darlington County
3
14Dillon County
3
15Dorchester County
3
16Edgefield County
3
17Fairfield County
3
18Florence County
3
19Georgetown County
3
20Greenwood County
3
21Hampton County
3
22Horry County
3
23Jasper County
3
24Kershaw County
3
25Lancaster 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 South Carolina”, https://gismap.land/rankings/south-carolina/highest-radon-counties. Figures from EPA Map of Radon Zones (September 2025).

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