Radon Levels in South Carolina
South Carolina is classified as an EPA Zone 3 state with a low risk for radon. Average indoor radon levels range from 0.5 to 3 pCi/L, and approximately 7% of South Carolina homes test above the EPA action level of 4.0 pCi/L.
South Carolina Radon Summary
Key Facts About Radon in South Carolina
- Most of South Carolina is EPA Zone 3 (low risk)
- The Upstate region (Greenville, Spartanburg) has slightly higher levels
- SCDHEC provides radon information and resources
South Carolina Testing Requirements & Recommendations
No mandate. SC recommends testing all homes.
Radon mitigation is less common in SC but services are available statewide.
Major Cities in South Carolina
Radon levels can vary significantly within South Carolina depending on local geology. All residents — regardless of city — should test their specific home, as neighborhood-level radon varies independently of broader state and county averages.
What Should South Carolina Residents Do?
Test Your Home
Use a short-term charcoal test kit ($15–$25) for an initial reading, or a continuous radon detector for ongoing monitoring. Test in your basement or lowest livable area.
Understand Your Result
If your result is below 2.0 pCi/L: monitor periodically. Between 2.0–4.0 pCi/L: consider mitigation. Above 4.0 pCi/L: the EPA recommends mitigation. Above 8.0 pCi/L: take action promptly.
Hire a Certified Contractor if Needed
Look for NRPP or NRSB-certified radon mitigation contractors in South Carolina. Mitigation systems typically cost $800–$2,500 and can reduce radon levels by 50–99%.
Verify with a Follow-Up Test
After mitigation, test again to confirm the system is working. Retest every 2 years, or after significant home renovations.
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