Radon in Kentucky

Of Kentucky's 120 counties and county equivalents, EPA places 30 in Zone 1, 82 in Zone 2, 8 in Zone 3. Zones are county-wide predictions; testing is the only way to know your home's level.

Radon in the news

Kentucky stories

UK researchers expand access to radon mitigation in Kentucky with $2.6 million grant
UKNow · 2024-11-13
Radon is No. 2 cause of lung cancer in Kentucky but less than 1% of houses have been tested
Hoptown Chronicle · 2023-05-31

Headlines link to the original publishers via Google News. Updated 2026-10-27.

All 120 counties

County	EPA 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

Source: EPA radon zones spreadsheet (EPA 402/A-16/001).