Radon by ZIP

Radon zones in South Carolina

Last updated

EPA’s Map of Radon Zones places 46 South Carolina counties in its three radon potential zones: 1 in Zone 1 (highest), 8 in Zone 2 (moderate), and 37 in Zone 3 (low).

1Zone 1 · Highest potential
8Zone 2 · Moderate potential
37Zone 3 · Low potential

What this means for South Carolina homes

Most South Carolina counties fall in Zone 3. EPA predicts lower average indoor levels (below 2 pCi/L) across much of South Carolina. That does not mean your home is low: EPA notes that elevated levels are found in Zone 3 counties too.

EPA’s guidance is the same everywhere: test your home, fix it if the level is 4 pCi/L or higher, and consider fixing between 2 and 4 pCi/L. The zone map is from 1993 and should not be used to decide whether a single home needs testing.

South Carolina radon program

EPA lists the following state contact for South Carolina: SC Department of Environmental Services, phone 800-768-0362. Website: des.sc.gov/programs/bureau-air-quality/air-pollution/radon. State programs can tell you about local testing data, free or discounted test kits, disclosure rules for home sales, and credentialed radon professionals.

South Carolina counties and their EPA radon zones

CountyEPA radon zone
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

County names follow the 2020 Census. Zones from the EPA Map of Radon Zones (text version). Rows marked “zone of” use the zone EPA gave the predecessor or surrounding county.

Next steps: read how to test your home, check a result with the level calculator, or look up a single address by ZIP code.

Sources

  1. U.S. EPA, EPA Map of Radon Zones (text version)
  2. U.S. EPA, EPA Map of Radon Zones and Supplemental Information (state radon contacts)
  3. U.S. EPA, EPA Maps of Radon Zones and Supporting Documents by State