Radon zones in Kentucky
Last updated
EPA’s Map of Radon Zones places 120 Kentucky counties in its three radon potential zones: 30 in Zone 1 (highest), 82 in Zone 2 (moderate), and 8 in Zone 3 (low).
What this means for Kentucky homes
Most Kentucky counties fall in Zone 2. EPA predicts moderate average indoor levels (2 to 4 pCi/L) across much of Kentucky. Many homes will be below the action level, but many will not, and only a test can tell which.
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.
Kentucky radon program
EPA lists the following state contact for Kentucky: the state radon program. Website: kentucky.gov/Pages/home.aspx. State programs can tell you about local testing data, free or discounted test kits, disclosure rules for home sales, and credentialed radon professionals.
Kentucky counties and their EPA radon zones
| County | EPA radon zone |
|---|---|
| Adair County | Zone 1 |
| Allen County | Zone 1 |
| Anderson County | Zone 2 |
| Ballard County | Zone 3 |
| Barren County | Zone 1 |
| Bath County | Zone 2 |
| Bell County | Zone 2 |
| Boone County | Zone 2 |
| Bourbon County | Zone 1 |
| Boyd County | Zone 2 |
| Boyle County | Zone 1 |
| Bracken County | Zone 2 |
| Breathitt County | Zone 2 |
| Breckinridge County | Zone 2 |
| Bullitt County | Zone 1 |
| Butler County | Zone 2 |
| Caldwell County | Zone 2 |
| Calloway County | Zone 3 |
| Campbell County | Zone 2 |
| Carlisle County | Zone 3 |
| Carroll County | Zone 2 |
| Carter County | Zone 2 |
| Casey County | Zone 1 |
| Christian County | Zone 2 |
| Clark County | Zone 1 |
| Clay County | Zone 2 |
| Clinton County | Zone 2 |
| Crittenden County | Zone 2 |
| Cumberland County | Zone 1 |
| Daviess County | Zone 2 |
| Edmonson County | Zone 2 |
| Elliott County | Zone 2 |
| Estill County | Zone 2 |
| Fayette County | Zone 1 |
| Fleming County | Zone 2 |
| Floyd County | Zone 2 |
| Franklin County | Zone 1 |
| Fulton County | Zone 3 |
| Gallatin County | Zone 2 |
| Garrard County | Zone 2 |
| Grant County | Zone 2 |
| Graves County | Zone 3 |
| Grayson County | Zone 2 |
| Green County | Zone 1 |
| Greenup County | Zone 2 |
| Hancock County | Zone 2 |
| Hardin County | Zone 2 |
| Harlan County | Zone 2 |
| Harrison County | Zone 1 |
| Hart County | Zone 1 |
| Henderson County | Zone 2 |
| Henry County | Zone 2 |
| Hickman County | Zone 3 |
| Hopkins County | Zone 2 |
| Jackson County | Zone 2 |
| Jefferson County | Zone 1 |
| Jessamine County | Zone 1 |
| Johnson County | Zone 2 |
| Kenton County | Zone 2 |
| Knott County | Zone 2 |
| Knox County | Zone 2 |
| Larue County | Zone 2 |
| Laurel County | Zone 2 |
| Lawrence County | Zone 2 |
| Lee County | Zone 2 |
| Leslie County | Zone 2 |
| Letcher County | Zone 2 |
| Lewis County | Zone 2 |
| Lincoln County | Zone 1 |
| Livingston County | Zone 2 |
| Logan County | Zone 2 |
| Lyon County | Zone 2 |
| Madison County | Zone 2 |
| Magoffin County | Zone 2 |
| Marion County | Zone 1 |
| Marshall County | Zone 3 |
| Martin County | Zone 2 |
| Mason County | Zone 2 |
| McCracken County | Zone 3 |
| McCreary County | Zone 2 |
| McLean County | Zone 2 |
| Meade County | Zone 2 |
| Menifee County | Zone 2 |
| Mercer County | Zone 1 |
| Metcalfe County | Zone 1 |
| Monroe County | Zone 1 |
| Montgomery County | Zone 2 |
| Morgan County | Zone 2 |
| Muhlenberg County | Zone 2 |
| Nelson County | Zone 1 |
| Nicholas County | Zone 2 |
| Ohio County | Zone 2 |
| Oldham County | Zone 2 |
| Owen County | Zone 2 |
| Owsley County | Zone 2 |
| Pendleton County | Zone 1 |
| Perry County | Zone 2 |
| Pike County | Zone 2 |
| Powell County | Zone 2 |
| Pulaski County | Zone 1 |
| Robertson County | Zone 1 |
| Rockcastle County | Zone 2 |
| Rowan County | Zone 2 |
| Russell County | Zone 1 |
| Scott County | Zone 1 |
| Shelby County | Zone 2 |
| Simpson County | Zone 2 |
| Spencer County | Zone 2 |
| Taylor County | Zone 1 |
| Todd County | Zone 2 |
| Trigg County | Zone 2 |
| Trimble County | Zone 2 |
| Union County | Zone 2 |
| Warren County | Zone 1 |
| Washington County | Zone 2 |
| Wayne County | Zone 2 |
| Webster County | Zone 2 |
| Whitley County | Zone 2 |
| Wolfe County | Zone 2 |
| Woodford 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.