Radon Levels in North Carolina
North Carolina is classified as an EPA Zone 2 state with a moderate risk for radon. Average indoor radon levels range from 1 to 4.5 pCi/L, and approximately 14% of North Carolina homes test above the EPA action level of 4.0 pCi/L.
North Carolina Radon Summary
Key Facts About Radon in North Carolina
- Western NC (Mountain region) has EPA Zone 1 levels
- The Piedmont region is Zone 2
- Coastal plain is Zone 3 (low risk)
- NC DHHS provides radon testing kits at reduced cost
North Carolina Testing Requirements & Recommendations
NC recommends testing all homes, particularly in the western counties. Disclosure required in home sales.
The mountain region of NC requires specialized mitigation in some geological formations.
Major Cities in North Carolina
Radon levels can vary significantly within North 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 North 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 North 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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