Radon Zone Map

All counties

Radon zones in Ohio

Adams CountyOhio1
Allen CountyOhio1
Ashland CountyOhio1
Ashtabula CountyOhio2
Athens CountyOhio2
Auglaize CountyOhio1
Belmont CountyOhio1
Brown CountyOhio2
Butler CountyOhio1
Carroll CountyOhio1
Champaign CountyOhio1
Clark CountyOhio1
Clermont CountyOhio2
Clinton CountyOhio1
Columbiana CountyOhio1
Coshocton CountyOhio1
Crawford CountyOhio1
Cuyahoga CountyOhio2
Darke CountyOhio1
Defiance CountyOhio2
Delaware CountyOhio1
Erie CountyOhio2
Fairfield CountyOhio1
Fayette CountyOhio1
Franklin CountyOhio1
Fulton CountyOhio2
Gallia CountyOhio2
Geauga CountyOhio2
Greene CountyOhio1
Guernsey CountyOhio1
Hamilton CountyOhio1
Hancock CountyOhio1
Hardin CountyOhio1
Harrison CountyOhio1
Henry CountyOhio2
Highland CountyOhio2
Hocking CountyOhio2
Holmes CountyOhio1
Huron CountyOhio1
Jackson CountyOhio2
Jefferson CountyOhio1
Knox CountyOhio1
Lake CountyOhio2
Lawrence CountyOhio2
Licking CountyOhio1
Logan CountyOhio1
Lorain CountyOhio2
Lucas CountyOhio2
Madison CountyOhio1
Mahoning CountyOhio2
Marion CountyOhio1
Medina CountyOhio2
Meigs CountyOhio2
Mercer CountyOhio1
Miami CountyOhio1
Monroe CountyOhio2
Montgomery CountyOhio1
Morgan CountyOhio2
Morrow CountyOhio1
Muskingum CountyOhio1
Noble CountyOhio2
Ottawa CountyOhio2
Paulding CountyOhio2
Perry CountyOhio1
Pickaway CountyOhio1
Pike CountyOhio1
Portage CountyOhio2
Preble CountyOhio1
Putnam CountyOhio2
Richland CountyOhio1
Ross CountyOhio1
Sandusky CountyOhio2
Scioto CountyOhio2
Seneca CountyOhio1
Shelby CountyOhio1
Stark CountyOhio1
Summit CountyOhio1
Trumbull CountyOhio2
Tuscarawas CountyOhio1
Union CountyOhio1
Van Wert CountyOhio1
Vinton CountyOhio2
Warren CountyOhio1
Washington CountyOhio2
Wayne CountyOhio1
Williams CountyOhio2
Wood CountyOhio2
Wyandot CountyOhio1

Sources

  1. Ohio: EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
  2. EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
  3. Ohio: EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
  4. EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
  5. Ohio: EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
  6. EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
  7. Ohio: EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
  8. EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
  9. Ohio: EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
  10. EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
  11. Ohio: EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
  12. EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026

"Secondary" marks a source used only because the official page could not be read.