Radon Levels in South Carolina

46 counties — 1 high risk, 8 moderate, 37 low risk

1
8
37
Zone 1 High (2.2%) Zone 2 Moderate (17.4%) Zone 3 Low (80.4%)

South Carolina Radon Zone Map

Counties colored by EPA radon zone. Red = Zone 1, Orange = Zone 2, Green = Zone 3.

Highest-Risk Counties

Greenville31.7% above action level

Check Your South Carolina ZIP Code

All 46 Counties — By Radon Risk

CountyEPA ZoneTests% Above 4 pCi/L
Greenville High 82 31.7%
Abbeville Moderate 5 —
Anderson Moderate 43 25.6%
Cherokee Moderate 8 62.5%
Laurens Moderate 16 25%
Oconee Moderate 17 41.2%
Pickens Moderate 19 31.6%
Spartanburg Moderate 46 32.6%
York Moderate 38 34.2%
Aiken Low 34 32.4%
Allendale Low — —
Bamberg Low — —
Barnwell Low 4 —
Beaufort Low 39 33.3%
Berkeley Low 31 32.3%
Calhoun Low — —
Charleston Low 71 38%
Chester Low 5 —
Chesterfield Low 9 44.4%
Clarendon Low 6 —
Colleton Low 10 —
Darlington Low 14 —
Dillon Low 8 —
Dorchester Low 25 36%
Edgefield Low 5 —
Fairfield Low 5 —
Florence Low 25 40%
Georgetown Low 18 27.8%
Greenwood Low 10 —
Hampton Low 4 —
Horry Low 68 41.2%
Jasper Low 4 —
Kershaw Low 7 57.1%
Lancaster Low 17 41.2%
Lee Low — —
Lexington Low 47 31.9%
Marion Low 7 —
Marlboro Low 6 —
McCormick Low — —
Newberry Low 8 —
Orangeburg Low 22 27.3%
Richland Low 56 30.4%
Saluda Low — —
Sumter Low 21 23.8%
Union Low 5 —
Williamsburg Low 7 —

Sources: EPA Map of Radon Zones, CDC Environmental Health Tracking Network

Frequently Asked Questions

How many counties in South Carolina have high radon risk?

South Carolina has 1 counties classified as EPA Zone 1 (high radon risk), 8 as Zone 2 (moderate), and 37 as Zone 3 (low risk).

Is radon a problem in South Carolina?

South Carolina has 1 high-risk counties where elevated radon is likely. The EPA recommends all homes in South Carolina be tested for radon, regardless of which zone they're in.

How do I check radon levels for my South Carolina address?

Enter your ZIP code in the search box above to see your county's EPA radon zone and available testing data. For your specific home's radon level, you'll need a radon test kit.