Alabama Radon Levels
13Zone 1 (High)
33Zone 2 (Moderate)
21Zone 3 (Low)
19% of counties in Alabama 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 |
|---|---|---|
| Autauga County | Zone 2 | Moderate Potential |
| Baldwin County | Zone 3 | Lowest Potential |
| Barbour County | Zone 2 | Moderate Potential |
| Bibb County | Zone 2 | Moderate Potential |
| Blount County | Zone 2 | Moderate Potential |
| Bullock County | Zone 2 | Moderate Potential |
| Butler County | Zone 3 | Lowest Potential |
| Calhoun County | Zone 1 | Highest Potential |
| Chambers County | Zone 3 | Lowest Potential |
| Cherokee County | Zone 2 | Moderate Potential |
| Chilton County | Zone 2 | Moderate Potential |
| Choctaw County | Zone 3 | Lowest Potential |
| Clarke County | Zone 3 | Lowest Potential |
| Clay County | Zone 1 | Highest Potential |
| Cleburne County | Zone 1 | Highest Potential |
| Coffee County | Zone 3 | Lowest Potential |
| Colbert County | Zone 1 | Highest Potential |
| Conecuh County | Zone 3 | Lowest Potential |
| Coosa County | Zone 1 | Highest Potential |
| Covington County | Zone 3 | Lowest Potential |
| Crenshaw County | Zone 3 | Lowest Potential |
| Cullman County | Zone 2 | Moderate Potential |
| Dale County | Zone 3 | Lowest Potential |
| Dallas County | Zone 2 | Moderate Potential |
| DeKalb County | Zone 2 | Moderate Potential |
| Elmore County | Zone 2 | Moderate Potential |
| Escambia County | Zone 3 | Lowest Potential |
| Etowah County | Zone 2 | Moderate Potential |
| Fayette County | Zone 2 | Moderate Potential |
| Franklin County | Zone 1 | Highest Potential |
| Geneva County | Zone 3 | Lowest Potential |
| Greene County | Zone 2 | Moderate Potential |
| Hale County | Zone 2 | Moderate Potential |
| Henry County | Zone 3 | Lowest Potential |
| Houston County | Zone 3 | Lowest Potential |
| Jackson County | Zone 1 | Highest Potential |
| Jefferson County | Zone 2 | Moderate Potential |
| Lamar County | Zone 2 | Moderate Potential |
| Lauderdale County | Zone 1 | Highest Potential |
| Lawrence County | Zone 1 | Highest Potential |
| Lee County | Zone 2 | Moderate Potential |
| Limestone County | Zone 1 | Highest Potential |
| Lowndes County | Zone 2 | Moderate Potential |
| Macon County | Zone 2 | Moderate Potential |
| Madison County | Zone 1 | Highest Potential |
| Marengo County | Zone 3 | Lowest Potential |
| Marion County | Zone 2 | Moderate Potential |
| Marshall County | Zone 2 | Moderate Potential |
| Mobile County | Zone 3 | Lowest Potential |
| Monroe County | Zone 3 | Lowest Potential |
| Montgomery County | Zone 2 | Moderate Potential |
| Morgan County | Zone 1 | Highest Potential |
| Perry County | Zone 2 | Moderate Potential |
| Pickens County | Zone 2 | Moderate Potential |
| Pike County | Zone 3 | Lowest Potential |
| Randolph County | Zone 2 | Moderate Potential |
| Russell County | Zone 2 | Moderate Potential |
| St. Clair County | Zone 2 | Moderate Potential |
| Shelby County | Zone 2 | Moderate Potential |
| Sumter County | Zone 2 | Moderate Potential |
| Talladega County | Zone 1 | Highest Potential |
| Tallapoosa County | Zone 3 | Lowest Potential |
| Tuscaloosa County | Zone 2 | Moderate Potential |
| Walker County | Zone 2 | Moderate Potential |
| Washington County | Zone 3 | Lowest Potential |
| Wilcox County | Zone 3 | Lowest Potential |
| Winston County | Zone 2 | Moderate Potential |