West Virginia Radon Levels
20Zone 1 (High)
29Zone 2 (Moderate)
6Zone 3 (Low)
36% of counties in West Virginia 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 |
|---|---|---|
| Barbour County | Zone 2 | Moderate Potential |
| Berkeley County | Zone 1 | Highest Potential |
| Boone County | Zone 3 | Lowest Potential |
| Braxton County | Zone 2 | Moderate Potential |
| Brooke County | Zone 1 | Highest Potential |
| Cabell County | Zone 2 | Moderate Potential |
| Calhoun County | Zone 2 | Moderate Potential |
| Clay County | Zone 2 | Moderate Potential |
| Doddridge County | Zone 2 | Moderate Potential |
| Fayette County | Zone 2 | Moderate Potential |
| Gilmer County | Zone 2 | Moderate Potential |
| Grant County | Zone 1 | Highest Potential |
| Greenbrier County | Zone 1 | Highest Potential |
| Hampshire County | Zone 1 | Highest Potential |
| Hancock County | Zone 1 | Highest Potential |
| Hardy County | Zone 1 | Highest Potential |
| Harrison County | Zone 2 | Moderate Potential |
| Jackson County | Zone 2 | Moderate Potential |
| Jefferson County | Zone 1 | Highest Potential |
| Kanawha County | Zone 3 | Lowest Potential |
| Lewis County | Zone 2 | Moderate Potential |
| Lincoln County | Zone 2 | Moderate Potential |
| Logan County | Zone 3 | Lowest Potential |
| McDowell County | Zone 3 | Lowest Potential |
| Marion County | Zone 2 | Moderate Potential |
| Marshall County | Zone 1 | Highest Potential |
| Mason County | Zone 2 | Moderate Potential |
| Mercer County | Zone 1 | Highest Potential |
| Mineral County | Zone 1 | Highest Potential |
| Mingo County | Zone 3 | Lowest Potential |
| Monongalia County | Zone 1 | Highest Potential |
| Monroe County | Zone 1 | Highest Potential |
| Morgan County | Zone 1 | Highest Potential |
| Nicholas County | Zone 2 | Moderate Potential |
| Ohio County | Zone 1 | Highest Potential |
| Pendleton County | Zone 1 | Highest Potential |
| Pleasants County | Zone 2 | Moderate Potential |
| Pocahontas County | Zone 1 | Highest Potential |
| Preston County | Zone 1 | Highest Potential |
| Putnam County | Zone 2 | Moderate Potential |
| Raleigh County | Zone 2 | Moderate Potential |
| Randolph County | Zone 2 | Moderate Potential |
| Ritchie County | Zone 2 | Moderate Potential |
| Roane County | Zone 2 | Moderate Potential |
| Summers County | Zone 1 | Highest Potential |
| Taylor County | Zone 2 | Moderate Potential |
| Tucker County | Zone 2 | Moderate Potential |
| Tyler County | Zone 2 | Moderate Potential |
| Upshur County | Zone 2 | Moderate Potential |
| Wayne County | Zone 2 | Moderate Potential |
| Webster County | Zone 2 | Moderate Potential |
| Wetzel County | Zone 1 | Highest Potential |
| Wirt County | Zone 2 | Moderate Potential |
| Wood County | Zone 2 | Moderate Potential |
| Wyoming County | Zone 3 | Lowest Potential |