EPA radon zones
South Carolina radon map: every county's zone
1 of South Carolina's 46 counties are EPA radon zone 1 (predicted average above 4 pCi/L), 8 are zone 2 and 37 are zone 3. High readings occur in every zone, so EPA recommends testing every home.
Abbeville CountyZone 2
Aiken CountyZone 3
Allendale CountyZone 3
Anderson CountyZone 2
Bamberg CountyZone 3
Barnwell CountyZone 3
Beaufort CountyZone 3
Berkeley CountyZone 3
Calhoun CountyZone 3
Charleston CountyZone 3
Cherokee CountyZone 2
Chester CountyZone 3
Chesterfield CountyZone 3
Clarendon CountyZone 3
Colleton CountyZone 3
Darlington CountyZone 3
Dillon CountyZone 3
Dorchester CountyZone 3
Edgefield CountyZone 3
Fairfield CountyZone 3
Florence CountyZone 3
Georgetown CountyZone 3
Greenville CountyZone 1
Greenwood CountyZone 3
Hampton CountyZone 3
Horry CountyZone 3
Jasper CountyZone 3
Kershaw CountyZone 3
Lancaster CountyZone 3
Laurens CountyZone 2
Lee CountyZone 3
Lexington CountyZone 3
Marion CountyZone 3
Marlboro CountyZone 3
McCormick CountyZone 3
Newberry CountyZone 3
Oconee CountyZone 2
Orangeburg CountyZone 3
Pickens CountyZone 2
Richland CountyZone 3
Saluda CountyZone 3
Spartanburg CountyZone 2
Sumter CountyZone 3
Union CountyZone 3
Williamsburg CountyZone 3
York CountyZone 2
How much does radon mitigation cost?
Most single-family systems cost $800 to $2,500 installed, depending on foundation type and how many suction points are needed. A follow-up test confirms the system works.
What do the zones mean?
EPA radon zones describe counties, not houses. Zone 1 counties have a predicted average indoor level above 4 picocuries per liter (pCi/L), Zone 2 between 2 and 4, Zone 3 below 2. Homes with high levels are found in every zone, which is why EPA recommends that every home be tested, and fixed at 4 pCi/L or above.
South Carolina cities: water and radon
Source: EPA Map of Radon Zones.