North Carolina Radon Levels
8Zone 1 (High)
31Zone 2 (Moderate)
61Zone 3 (Low)
8% of counties in North Carolina are classified as EPA Zone 1 (highest radon potential), meaning predicted average indoor radon levels exceed 4 pCi/L — the EPA action level. The EPA recommends that all homes be tested for radon, regardless of zone classification.
| County | EPA Zone | Risk Level |
|---|---|---|
| Alamance County | Zone 3 | Lowest Potential |
| Alexander County | Zone 2 | Moderate Potential |
| Alleghany County | Zone 1 | Highest Potential |
| Anson County | Zone 3 | Lowest Potential |
| Ashe County | Zone 2 | Moderate Potential |
| Avery County | Zone 2 | Moderate Potential |
| Beaufort County | Zone 3 | Lowest Potential |
| Bertie County | Zone 3 | Lowest Potential |
| Bladen County | Zone 3 | Lowest Potential |
| Brunswick County | Zone 3 | Lowest Potential |
| Buncombe County | Zone 1 | Highest Potential |
| Burke County | Zone 2 | Moderate Potential |
| Cabarrus County | Zone 3 | Lowest Potential |
| Caldwell County | Zone 2 | Moderate Potential |
| Camden County | Zone 3 | Lowest Potential |
| Carteret County | Zone 3 | Lowest Potential |
| Caswell County | Zone 2 | Moderate Potential |
| Catawba County | Zone 2 | Moderate Potential |
| Chatham County | Zone 3 | Lowest Potential |
| Cherokee County | Zone 1 | Highest Potential |
| Chowan County | Zone 3 | Lowest Potential |
| Clay County | Zone 2 | Moderate Potential |
| Cleveland County | Zone 2 | Moderate Potential |
| Columbus County | Zone 3 | Lowest Potential |
| Craven County | Zone 3 | Lowest Potential |
| Cumberland County | Zone 3 | Lowest Potential |
| Currituck County | Zone 3 | Lowest Potential |
| Dare County | Zone 3 | Lowest Potential |
| Davidson County | Zone 3 | Lowest Potential |
| Davie County | Zone 3 | Lowest Potential |
| Duplin County | Zone 3 | Lowest Potential |
| Durham County | Zone 3 | Lowest Potential |
| Edgecombe County | Zone 3 | Lowest Potential |
| Forsyth County | Zone 2 | Moderate Potential |
| Franklin County | Zone 2 | Moderate Potential |
| Gaston County | Zone 2 | Moderate Potential |
| Gates County | Zone 3 | Lowest Potential |
| Graham County | Zone 2 | Moderate Potential |
| Granville County | Zone 3 | Lowest Potential |
| Greene County | Zone 3 | Lowest Potential |
| Guilford County | Zone 3 | Lowest Potential |
| Halifax County | Zone 3 | Lowest Potential |
| Harnett County | Zone 3 | Lowest Potential |
| Haywood County | Zone 2 | Moderate Potential |
| Henderson County | Zone 1 | Highest Potential |
| Hertford County | Zone 3 | Lowest Potential |
| Hoke County | Zone 3 | Lowest Potential |
| Hyde County | Zone 3 | Lowest Potential |
| Iredell County | Zone 2 | Moderate Potential |
| Jackson County | Zone 2 | Moderate Potential |
| Johnston County | Zone 3 | Lowest Potential |
| Jones County | Zone 3 | Lowest Potential |
| Lee County | Zone 3 | Lowest Potential |
| Lenoir County | Zone 3 | Lowest Potential |
| Lincoln County | Zone 2 | Moderate Potential |
| McDowell County | Zone 2 | Moderate Potential |
| Macon County | Zone 2 | Moderate Potential |
| Madison County | Zone 2 | Moderate Potential |
| Martin County | Zone 3 | Lowest Potential |
| Mecklenburg County | Zone 3 | Lowest Potential |
| Mitchell County | Zone 1 | Highest Potential |
| Montgomery County | Zone 3 | Lowest Potential |
| Moore County | Zone 3 | Lowest Potential |
| Nash County | Zone 3 | Lowest Potential |
| New Hanover County | Zone 3 | Lowest Potential |
| Northampton County | Zone 3 | Lowest Potential |
| Onslow County | Zone 3 | Lowest Potential |
| Orange County | Zone 3 | Lowest Potential |
| Pamlico County | Zone 3 | Lowest Potential |
| Pasquotank County | Zone 3 | Lowest Potential |
| Pender County | Zone 3 | Lowest Potential |
| Perquimans County | Zone 3 | Lowest Potential |
| Person County | Zone 3 | Lowest Potential |
| Pitt County | Zone 3 | Lowest Potential |
| Polk County | Zone 2 | Moderate Potential |
| Randolph County | Zone 3 | Lowest Potential |
| Richmond County | Zone 3 | Lowest Potential |
| Robeson County | Zone 3 | Lowest Potential |
| Rockingham County | Zone 1 | Highest Potential |
| Rowan County | Zone 3 | Lowest Potential |
| Rutherford County | Zone 2 | Moderate Potential |
| Sampson County | Zone 3 | Lowest Potential |
| Scotland County | Zone 3 | Lowest Potential |
| Stanly County | Zone 3 | Lowest Potential |
| Stokes County | Zone 2 | Moderate Potential |
| Surry County | Zone 2 | Moderate Potential |
| Swain County | Zone 2 | Moderate Potential |
| Transylvania County | Zone 1 | Highest Potential |
| Tyrrell County | Zone 3 | Lowest Potential |
| Union County | Zone 3 | Lowest Potential |
| Vance County | Zone 2 | Moderate Potential |
| Wake County | Zone 2 | Moderate Potential |
| Warren County | Zone 2 | Moderate Potential |
| Washington County | Zone 3 | Lowest Potential |
| Watauga County | Zone 1 | Highest Potential |
| Wayne County | Zone 3 | Lowest Potential |
| Wilkes County | Zone 2 | Moderate Potential |
| Wilson County | Zone 3 | Lowest Potential |
| Yadkin County | Zone 2 | Moderate Potential |
| Yancey County | Zone 2 | Moderate Potential |