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Radon zones in Kentucky

The EPA assigns every county in Kentucky to one of three radon potential zones. 30 are in Zone 1, the highest category, home to about 45% of the state's residents.

120
Counties
30
Zone 1 counties
Predicted average above 4 pCi/L
82
Zone 2 counties
Predicted average 2-4 pCi/L
8
Zone 3 counties
Predicted average below 2 pCi/L

The map

Radon potential across Kentucky

Every county in Kentucky, filled by the zone the EPA assigns it. Zones follow geology rather than county lines, so the colour usually changes where the bedrock does, not where the border is.

Zone 1 · 30Zone 2 · 82Zone 3 · 8

Hover a county · click to open it

County by county

All 120 Kentucky counties

Zone 1 · > 4 pCi/LZone 2 · 2 - 4 pCi/LZone 3 · < 2 pCi/L
CountyZonePopulationCOPDSmokingLung ca. deaths
Adair County119k11.6%19.1%57.6
Allen County121k11.9%20.8%61.0
Barren County145k11.7%18.3%60.4
Bourbon County120k11.7%19.2%41.0
Boyle County131k9.7%16.6%42.1
Bullitt County184k9.8%19.2%43.0
Casey County116k17.4%26.1%58.0
Clark County137k10.4%19.2%49.9
Cumberland County15,94615.1%23.1%65.4
Fayette County1320k7.7%15.4%33.8
Franklin County152k8.9%15.6%36.7
Green County111k14.9%25.1%61.5
Harrison County119k10.5%19.4%59.7
Hart County120k14.1%24.3%57.9
Jefferson County1773k8.2%16.4%41.6
Jessamine County154k8.5%14.6%43.2
Lincoln County124k12.8%20.4%61.3
Marion County120k11.8%21.5%54.6
Mercer County123k10.8%17.3%54.4
Metcalfe County110k12.5%23.1%76.1
Monroe County111k11.7%20.5%63.2
Nelson County147k8.9%16.1%46.5
Pendleton County115k12.2%20.9%70.8
Pulaski County166k13.2%22.6%54.7
Robertson County12,22914.9%23.0% -
Russell County118k16.6%25.6%70.7
Scott County159k7.7%15.8%42.4
Taylor County126k10.8%19.5%59.5
Warren County1140k8.1%14.7%48.8
Woodford County127k8.7%12.5%40.5
Anderson County224k10.4%20.0%40.4
Bath County213k10.1%19.2%58.7
Bell County224k15.5%24.9%73.8
Boone County2139k7.7%16.7%33.7
Boyd County248k11.2%19.1%48.2
Bracken County28,45211.3%19.4%62.3
Breathitt County213k14.2%24.0%74.0
Breckinridge County221k15.1%26.0%58.3
Butler County212k12.8%22.0%79.2
Caldwell County213k11.0%19.7%47.4
Campbell County293k8.3%15.2%44.0
Carroll County211k12.2%22.0%72.3
Carter County226k12.9%21.1%66.0
Christian County273k9.2%19.3%53.3
Clay County220k14.9%27.0%84.3
Clinton County29,12313.8%21.9%77.4
Crittenden County28,98112.2%19.6%45.1
Daviess County2103k10.2%18.5%47.5
Edmonson County212k13.1%22.6%58.9
Elliott County27,29314.5%22.9%59.6
Estill County214k14.6%25.3%62.4
Fleming County215k13.2%23.4%51.6
Floyd County235k12.8%22.2%77.0
Gallatin County28,76310.4%20.1%51.7
Garrard County218k12.9%20.8%55.1
Grant County226k10.2%21.0%51.9
Grayson County227k13.1%21.3%79.2
Greenup County235k11.8%19.0%47.1
Hancock County29,02110.1%17.9%50.2
Hardin County2112k9.4%17.5%51.0
Harlan County226k16.3%27.2%76.0
Henderson County244k8.9%16.3%45.1
Henry County216k12.9%20.7%50.9
Hopkins County245k13.5%22.2%53.2
Jackson County213k16.7%28.6%52.7
Johnson County222k14.5%25.7%54.4
Kenton County2170k8.3%15.4%47.6
Knott County214k16.9%25.3%64.9
Knox County230k13.9%23.3%73.5
Larue County215k13.0%23.6%49.1
Laurel County263k12.5%21.5%59.9
Lawrence County216k13.7%22.4%66.2
Lee County27,26117.2%29.7%65.2
Leslie County210k15.2%23.5%84.0
Letcher County221k12.6%20.1%52.2
Lewis County213k15.7%25.8%76.7
Livingston County28,96310.9%18.1%67.2
Logan County228k11.0%17.9%50.2
Lyon County29,10111.4%18.5%36.3
Madison County295k8.6%16.4%51.2
Magoffin County211k17.0%27.7%59.1
Martin County211k15.6%29.1%66.0
Mason County217k11.7%21.0%52.1
McCreary County217k15.3%25.9%81.4
McLean County29,10511.0%19.3%64.0
Meade County230k9.4%19.0%52.7
Menifee County26,25014.4%24.4%66.1
Montgomery County228k12.0%21.6%66.9
Morgan County214k12.5%23.9%61.1
Muhlenberg County230k12.1%21.3%51.4
Nicholas County27,80512.4%21.8%34.7
Ohio County224k12.2%21.5%59.1
Oldham County269k6.1%12.1%30.9
Owen County211k11.6%20.5%52.1
Owsley County23,92914.7%24.6%90.8
Perry County227k13.1%21.7%83.1
Pike County256k13.2%23.6%66.7
Powell County213k11.1%20.6%73.3
Rockcastle County216k14.7%25.2%67.4
Rowan County224k10.9%18.5%60.2
Shelby County249k8.3%15.5%43.6
Simpson County220k9.9%18.6%50.5
Spencer County220k9.6%18.8%37.8
Todd County212k13.4%23.1%64.6
Trigg County214k13.9%20.1%57.8
Trimble County28,53910.6%19.4%46.2
Union County213k12.0%23.1%49.2
Washington County212k11.0%17.8%36.7
Wayne County220k16.1%25.1%50.8
Webster County213k12.2%22.1%54.4
Whitley County237k11.5%21.3%73.6
Wolfe County26,40019.4%30.4%60.7
Ballard County37,65012.4%21.0%49.1
Calloway County338k9.4%15.2%59.9
Carlisle County34,72011.9%20.9%73.9
Fulton County36,38215.5%25.9%73.8
Graves County336k10.8%19.7%51.1
Hickman County34,42211.7%17.8%62.0
Marshall County332k11.0%17.7%56.2
McCracken County367k12.0%19.5%42.0

Zones from the EPA Map of Radon Zones. COPD and smoking are CDC PLACES model-based estimates of adult prevalence. Lung cancer death rates are age-adjusted deaths per 100,000 per year, 2019-2023, from NCI State Cancer Profiles. A dash means the source does not report a value for that county.

Highest potential

Zone 1 counties in Kentucky

These 30 counties have a predicted average indoor radon screening level above the EPA action level. The EPA recommends every home in them be tested.

Other states

Radon zones elsewhere