West Virginia: 55 counties covered
Of 55 rated West Virginia counties, 20 are in EPA's highest radon-potential zone (Zone 1) — but every county page links to testing guidance regardless of zone, because a county rating is a county-wide average, not a reading for any one house.
- Kanawha County
- Berkeley County
- Monongalia County
- Cabell County
- Wood County
- Raleigh County
- Harrison County
- Jefferson County
- Mercer County
- Putnam County
- Marion County
- Ohio County
- Fayette County
- Wayne County
- Preston County
- Greenbrier County
- Logan County
- Marshall County
- Hancock County
- Jackson County
- Randolph County
- Mineral County
- Mason County
- Nicholas County
- Hampshire County
- Upshur County
- Mingo County
- Brooke County
- Boone County
- Wyoming County
- Lincoln County
- Morgan County
- McDowell County
- Lewis County
- Taylor County
- Barbour County
- Hardy County
- Wetzel County
- Roane County
- Monroe County
- Braxton County
- Summers County
- Grant County
- Ritchie County
- Webster County
- Tyler County
- Clay County
- Pocahontas County
- Doddridge County
- Pleasants County
- Gilmer County
- Tucker County
- Pendleton County
- Calhoun County
- Wirt County