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State overview
Radon in South Carolina
Of South Carolina's 46 counties and county equivalents, EPA places 1 in Zone 1, 8 in Zone 2, 37 in Zone 3. Zones are county-wide predictions; testing is the only way to know your home's level.
Radon in the news
South Carolina stories
- DHEC map shows average radon levels are higher in the Upstate than other parts of South CarolinaWYFF · 2023-05-23
Headlines link to the original publishers via Google News. Updated 2026-10-27.
All 46 counties
| County | EPA zone |
|---|---|
| Abbeville County | Zone 2 |
| Aiken County | Zone 3 |
| Allendale County | Zone 3 |
| Anderson County | Zone 2 |
| Bamberg County | Zone 3 |
| Barnwell County | Zone 3 |
| Beaufort County | Zone 3 |
| Berkeley County | Zone 3 |
| Calhoun County | Zone 3 |
| Charleston County | Zone 3 |
| Cherokee County | Zone 2 |
| Chester County | Zone 3 |
| Chesterfield County | Zone 3 |
| Clarendon County | Zone 3 |
| Colleton County | Zone 3 |
| Darlington County | Zone 3 |
| Dillon County | Zone 3 |
| Dorchester County | Zone 3 |
| Edgefield County | Zone 3 |
| Fairfield County | Zone 3 |
| Florence County | Zone 3 |
| Georgetown County | Zone 3 |
| Greenville County | Zone 1 |
| Greenwood County | Zone 3 |
| Hampton County | Zone 3 |
| Horry County | Zone 3 |
| Jasper County | Zone 3 |
| Kershaw County | Zone 3 |
| Lancaster County | Zone 3 |
| Laurens County | Zone 2 |
| Lee County | Zone 3 |
| Lexington County | Zone 3 |
| Marion County | Zone 3 |
| Marlboro County | Zone 3 |
| McCormick County | Zone 3 |
| Newberry County | Zone 3 |
| Oconee County | Zone 2 |
| Orangeburg County | Zone 3 |
| Pickens County | Zone 2 |
| Richland County | Zone 3 |
| Saluda County | Zone 3 |
| Spartanburg County | Zone 2 |
| Sumter County | Zone 3 |
| Union County | Zone 3 |
| Williamsburg County | Zone 3 |
| York County | Zone 2 |
Source: EPA radon zones spreadsheet (EPA 402/A-16/001).