Radon zones in Tennessee
Last updated
EPA’s Map of Radon Zones places 95 Tennessee counties in its three radon potential zones: 39 in Zone 1 (highest), 32 in Zone 2 (moderate), and 24 in Zone 3 (low).
What this means for Tennessee homes
Most Tennessee counties fall in Zone 1. EPA predicts average indoor screening levels above 4 pCi/L across much of Tennessee, so elevated radon is common. Testing is especially worthwhile here, and radon-resistant construction features make sense for new homes.
EPA’s guidance is the same everywhere: test your home, fix it if the level is 4 pCi/L or higher, and consider fixing between 2 and 4 pCi/L. The zone map is from 1993 and should not be used to decide whether a single home needs testing.
Tennessee radon program
EPA lists the following state contact for Tennessee: TN Radon Program, phone 615-532-0738. Website: www.tn.gov/content/tn/environment.html. State programs can tell you about local testing data, free or discounted test kits, disclosure rules for home sales, and credentialed radon professionals.
Tennessee counties and their EPA radon zones
| County | EPA radon zone |
|---|---|
| Anderson County | Zone 1 |
| Bedford County | Zone 1 |
| Benton County | Zone 2 |
| Bledsoe County | Zone 3 |
| Blount County | Zone 1 |
| Bradley County | Zone 1 |
| Campbell County | Zone 3 |
| Cannon County | Zone 2 |
| Carroll County | Zone 3 |
| Carter County | Zone 2 |
| Cheatham County | Zone 2 |
| Chester County | Zone 2 |
| Claiborne County | Zone 1 |
| Clay County | Zone 2 |
| Cocke County | Zone 2 |
| Coffee County | Zone 2 |
| Crockett County | Zone 3 |
| Cumberland County | Zone 3 |
| Davidson County | Zone 1 |
| Decatur County | Zone 2 |
| DeKalb County | Zone 2 |
| Dickson County | Zone 2 |
| Dyer County | Zone 3 |
| Fayette County | Zone 3 |
| Fentress County | Zone 2 |
| Franklin County | Zone 3 |
| Gibson County | Zone 3 |
| Giles County | Zone 1 |
| Grainger County | Zone 1 |
| Greene County | Zone 1 |
| Grundy County | Zone 3 |
| Hamblen County | Zone 1 |
| Hamilton County | Zone 2 |
| Hancock County | Zone 1 |
| Hardeman County | Zone 3 |
| Hardin County | Zone 2 |
| Hawkins County | Zone 1 |
| Haywood County | Zone 3 |
| Henderson County | Zone 2 |
| Henry County | Zone 3 |
| Hickman County | Zone 1 |
| Houston County | Zone 2 |
| Humphreys County | Zone 1 |
| Jackson County | Zone 1 |
| Jefferson County | Zone 1 |
| Johnson County | Zone 2 |
| Knox County | Zone 1 |
| Lake County | Zone 3 |
| Lauderdale County | Zone 3 |
| Lawrence County | Zone 1 |
| Lewis County | Zone 1 |
| Lincoln County | Zone 1 |
| Loudon County | Zone 1 |
| Macon County | Zone 1 |
| Madison County | Zone 1 |
| Marion County | Zone 2 |
| Marshall County | Zone 1 |
| Maury County | Zone 3 |
| McMinn County | Zone 1 |
| McNairy County | Zone 2 |
| Meigs County | Zone 1 |
| Monroe County | Zone 1 |
| Montgomery County | Zone 2 |
| Moore County | Zone 1 |
| Morgan County | Zone 3 |
| Obion County | Zone 3 |
| Overton County | Zone 2 |
| Perry County | Zone 1 |
| Pickett County | Zone 2 |
| Polk County | Zone 2 |
| Putnam County | Zone 2 |
| Rhea County | Zone 3 |
| Roane County | Zone 1 |
| Robertson County | Zone 2 |
| Rutherford County | Zone 1 |
| Scott County | Zone 3 |
| Sequatchie County | Zone 3 |
| Sevier County | Zone 2 |
| Shelby County | Zone 3 |
| Smith County | Zone 1 |
| Stewart County | Zone 2 |
| Sullivan County | Zone 1 |
| Sumner County | Zone 2 |
| Tipton County | Zone 3 |
| Trousdale County | Zone 1 |
| Unicoi County | Zone 2 |
| Union County | Zone 1 |
| Van Buren County | Zone 2 |
| Warren County | Zone 2 |
| Washington County | Zone 1 |
| Wayne County | Zone 1 |
| Weakley County | Zone 3 |
| White County | Zone 2 |
| Williamson County | Zone 1 |
| Wilson County | Zone 1 |
County names follow the 2020 Census. Zones from the EPA Map of Radon Zones (text version). Rows marked “zone of” use the zone EPA gave the predecessor or surrounding county.
Next steps: read how to test your home, check a result with the level calculator, or look up a single address by ZIP code.