North Carolina has 100 counties, with 8 classified as EPA Zone 1 (highest risk). With an average radon level of 7.42 pCi/L, North Carolina state testing data reveals significantly elevated risks across multiple counties. Testing is highly recommended.
North Carolina is the 28th most expansive state in terms of size and the 10th most populous in the entire US.
North Carolina does have an active radon program, dedicated to educating citizens about the risks associated with the deadly gas. You can find more information on Radon, testing and mitigation at the official page.
Explore radon data organized by metro region, including average levels, hotspot cities, and local mitigation professionals.
Cities with the most user-submitted radon test data, ranked by number of submissions.
| City | Avg User Radon Level | Submissions |
|---|---|---|
| Murphy | 12.83 pCi/L | 6 |
| Blowing Rock | 10.17 pCi/L | 6 |
| Brevard | 7.50 pCi/L | 4 |
| Cary | 5.00 pCi/L | 4 |
| Highlands | 4.50 pCi/L | 4 |
| Mooresville | 4.00 pCi/L | 4 |
| Banner Elk | 9.33 pCi/L | 3 |
| Charlotte | 7.33 pCi/L | 3 |
| Denver | 4.33 pCi/L | 3 |
| Hendersonville | 9.00 pCi/L | 2 |
| Wake Forest | 4.50 pCi/L | 2 |
| Apex | 3.50 pCi/L | 2 |
| Huntersville | 3.50 pCi/L | 2 |
| Raleigh | 9.00 pCi/L | 1 |
| Fayetteville | 5.00 pCi/L | 1 |
| Waxhaw | 4.00 pCi/L | 1 |
| Chapel Hill | 3.00 pCi/L | 1 |
| Clayton | No submissions | 0 |
| Fuquay Varina | No submissions | 0 |
| Holly Springs | No submissions | 0 |
All 100 North Carolina counties with their EPA radon zone classification and user-submitted average radon levels.
Browse radon data for individual cities across North Carolina. Each city page includes user-submitted radon levels, local contractors, and mitigation resources.