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Radon zones in West Virginia

The EPA assigns every county in West Virginia to one of three radon potential zones. 20 are in Zone 1, the highest category, home to about 39% of the state's residents.

55
Counties
20
Zone 1 counties
Predicted average above 4 pCi/L
29
Zone 2 counties
Predicted average 2-4 pCi/L
6
Zone 3 counties
Predicted average below 2 pCi/L

The map

Radon potential across West Virginia

Every county in West Virginia, 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 · 20Zone 2 · 29Zone 3 · 6

Hover a county · click to open it

County by county

All 55 West Virginia counties

Zone 1 · > 4 pCi/LZone 2 · 2 - 4 pCi/LZone 3 · < 2 pCi/L
CountyZonePopulationCOPDSmokingLung ca. deaths
Berkeley County1132k8.4%17.4%51.3
Brooke County121k9.8%16.9%48.6
Grant County111k11.2%19.2%31.4
Greenbrier County132k12.4%20.8%55.5
Hampshire County124k11.3%20.3%39.8
Hancock County128k10.8%18.6%49.9
Hardy County114k12.6%21.6%32.0
Jefferson County160k7.6%15.1%47.6
Marshall County129k11.1%20.4%42.5
Mercer County158k12.1%21.1%45.7
Mineral County127k9.8%17.5%31.1
Monongalia County1108k6.7%13.9%28.7
Monroe County112k12.3%20.5%50.6
Morgan County118k11.1%19.4%57.5
Ohio County141k9.4%16.3%46.7
Pendleton County16,02912.2%19.3%37.5
Pocahontas County17,76513.9%22.2%43.3
Preston County134k10.5%20.6%33.4
Summers County112k13.9%22.6%43.8
Wetzel County114k11.7%20.6%57.8
Barbour County215k11.9%21.4%50.2
Braxton County212k14.3%24.1%46.3
Cabell County292k9.8%17.8%47.1
Calhoun County25,95916.2%26.2%43.7
Clay County27,78314.0%24.3%48.6
Doddridge County27,68011.5%21.5%54.1
Fayette County239k12.2%21.7%56.1
Gilmer County27,25410.1%20.7%67.1
Harrison County265k10.2%18.8%53.9
Jackson County228k11.1%19.7%46.2
Lewis County217k11.6%21.2%60.2
Lincoln County220k13.8%24.6%85.5
Marion County256k9.3%17.7%52.5
Mason County225k12.5%21.9%55.5
Nicholas County224k11.9%20.7%41.8
Pleasants County27,42810.0%19.7%55.2
Putnam County257k8.8%16.3%38.9
Raleigh County272k12.1%20.5%50.3
Randolph County227k10.9%20.0%47.6
Ritchie County28,16713.4%23.3%45.9
Roane County214k14.4%23.9%53.0
Taylor County216k11.2%20.5%52.8
Tucker County26,60411.3%18.5%52.8
Tyler County27,91911.9%20.2%43.8
Upshur County224k11.5%20.9%41.7
Wayne County238k12.0%21.5%56.1
Webster County28,04514.8%24.2%43.4
Wirt County25,00012.7%21.4%41.3
Wood County283k10.8%18.9%49.9
Boone County321k12.4%21.9%64.6
Kanawha County3175k9.8%18.9%47.1
Logan County331k13.5%24.0%51.1
McDowell County317k16.5%28.7%59.1
Mingo County322k16.1%27.6%71.2
Wyoming County320k14.0%24.6%52.7

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 West Virginia

These 20 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