EPA radon zones
Ohio radon map: every county's zone
53 of Ohio's 88 counties are EPA radon zone 1 (predicted average above 4 pCi/L), 35 are zone 2 and 0 are zone 3. High readings occur in every zone, so EPA recommends testing every home.
Adams CountyZone 1
Allen CountyZone 1
Ashland CountyZone 1
Ashtabula CountyZone 2
Athens CountyZone 2
Auglaize CountyZone 1
Belmont CountyZone 1
Brown CountyZone 2
Butler CountyZone 1
Carroll CountyZone 1
Champaign CountyZone 1
Clark CountyZone 1
Clermont CountyZone 2
Clinton CountyZone 1
Columbiana CountyZone 1
Coshocton CountyZone 1
Crawford CountyZone 1
Cuyahoga CountyZone 2
Darke CountyZone 1
Defiance CountyZone 2
Delaware CountyZone 1
Erie CountyZone 2
Fairfield CountyZone 1
Fayette CountyZone 1
Franklin CountyZone 1
Fulton CountyZone 2
Gallia CountyZone 2
Geauga CountyZone 2
Greene CountyZone 1
Guernsey CountyZone 1
Hamilton CountyZone 1
Hancock CountyZone 1
Hardin CountyZone 1
Harrison CountyZone 1
Henry CountyZone 2
Highland CountyZone 2
Hocking CountyZone 2
Holmes CountyZone 1
Huron CountyZone 1
Jackson CountyZone 2
Jefferson CountyZone 1
Knox CountyZone 1
Lake CountyZone 2
Lawrence CountyZone 2
Licking CountyZone 1
Logan CountyZone 1
Lorain CountyZone 2
Lucas CountyZone 2
Madison CountyZone 1
Mahoning CountyZone 2
Marion CountyZone 1
Medina CountyZone 2
Meigs CountyZone 2
Mercer CountyZone 1
Miami CountyZone 1
Monroe CountyZone 2
Montgomery CountyZone 1
Morgan CountyZone 2
Morrow CountyZone 1
Muskingum CountyZone 1
Noble CountyZone 2
Ottawa CountyZone 2
Paulding CountyZone 2
Perry CountyZone 1
Pickaway CountyZone 1
Pike CountyZone 1
Portage CountyZone 2
Preble CountyZone 1
Putnam CountyZone 2
Richland CountyZone 1
Ross CountyZone 1
Sandusky CountyZone 2
Scioto CountyZone 2
Seneca CountyZone 1
Shelby CountyZone 1
Stark CountyZone 1
Summit CountyZone 1
Trumbull CountyZone 2
Tuscarawas CountyZone 1
Union CountyZone 1
Van Wert CountyZone 1
Vinton CountyZone 2
Warren CountyZone 1
Washington CountyZone 2
Wayne CountyZone 1
Williams CountyZone 2
Wood CountyZone 2
Wyandot CountyZone 1
How much does radon mitigation cost?
Most single-family systems cost $800 to $2,500 installed, depending on foundation type and how many suction points are needed. A follow-up test confirms the system works.
What do the zones mean?
EPA radon zones describe counties, not houses. Zone 1 counties have a predicted average indoor level above 4 picocuries per liter (pCi/L), Zone 2 between 2 and 4, Zone 3 below 2. Homes with high levels are found in every zone, which is why EPA recommends that every home be tested, and fixed at 4 pCi/L or above.
Ohio cities: water and radon
Source: EPA Map of Radon Zones.