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Radon zones in South Carolina

The EPA assigns every county in South Carolina to one of three radon potential zones. 1 are in Zone 1, the highest category, home to about 10% of the state's residents.

46
Counties
1
Zone 1 counties
Predicted average above 4 pCi/L
8
Zone 2 counties
Predicted average 2-4 pCi/L
37
Zone 3 counties
Predicted average below 2 pCi/L

The map

Radon potential across South Carolina

Every county in South Carolina, filled by the zone the EPA assigns it. Zones follow geology rather than county lines, so the colour usually changes where the bedrock does, not where the border is.

Zone 1 · 1Zone 2 · 8Zone 3 · 37

Hover a county · click to open it

County by county

All 46 South Carolina counties

Zone 1 · > 4 pCi/LZone 2 · 2 - 4 pCi/LZone 3 · < 2 pCi/L
CountyZonePopulationCOPDSmokingLung ca. deaths
Greenville County1558k6.4%11.3%28.9
Abbeville County224k9.9%16.0%42.4
Anderson County2213k8.2%14.2%38.7
Cherokee County257k9.4%17.3%50.2
Laurens County269k9.0%16.5%46.7
Oconee County281k9.9%14.7%35.8
Pickens County2135k7.8%13.5%34.5
Spartanburg County2357k7.5%14.2%38.1
York County2298k6.0%11.3%36.4
Aiken County3177k7.5%13.4%34.6
Allendale County37,36910.7%19.0%43.9
Bamberg County313k9.9%16.3%42.2
Barnwell County320k11.6%19.5%37.4
Beaufort County3199k7.0%9.6%24.4
Berkeley County3255k6.2%12.9%35.0
Calhoun County314k8.8%14.1%35.7
Charleston County3424k5.7%10.5%28.7
Chester County332k9.9%17.8%63.4
Chesterfield County344k10.3%18.1%57.2
Clarendon County331k10.5%16.9%47.6
Colleton County339k10.0%17.6%53.9
Darlington County362k9.4%16.4%42.2
Dillon County328k11.8%21.0%65.3
Dorchester County3170k6.5%13.2%34.6
Edgefield County328k8.8%16.3%34.8
Fairfield County320k10.3%17.2%44.6
Florence County3137k8.1%14.8%40.2
Georgetown County366k8.6%11.9%33.0
Greenwood County369k8.6%15.0%39.5
Hampton County318k10.1%19.1%41.5
Horry County3397k9.0%14.6%38.2
Jasper County334k8.9%14.0%36.8
Kershaw County370k7.9%14.5%51.3
Lancaster County3108k7.5%12.6%37.3
Lee County316k10.4%18.6%56.9
Lexington County3310k6.9%13.0%38.4
Marion County329k11.8%20.1%50.9
Marlboro County326k11.4%21.0%57.7
McCormick County39,94111.0%14.6%31.3
Newberry County339k8.7%15.3%43.7
Orangeburg County383k9.6%16.4%33.9
Richland County3425k5.8%11.2%35.0
Saluda County319k9.6%15.9%32.8
Sumter County3104k8.0%15.0%44.0
Union County327k11.9%19.2%56.9
Williamsburg County330k10.0%17.5%39.0

Zones from the EPA Map of Radon Zones. COPD and smoking are CDC PLACES model-based estimates of adult prevalence. Lung cancer death rates are age-adjusted deaths per 100,000 per year, 2019-2023, from NCI State Cancer Profiles. A dash means the source does not report a value for that county.

Highest potential

Zone 1 counties in South Carolina

These 1 counties have a predicted average indoor radon screening level above the EPA action level. The EPA recommends every home in them be tested.

Other states

Radon zones elsewhere