Radon zones in Ohio
Zone 1: 53, Zone 2: 35, Zone 3: 0. A zone is an area estimate; EPA says all homes should be tested.
- Adams County Zone 1
- Allen County Zone 1
- Ashland County Zone 1
- Ashtabula County Zone 2
- Athens County Zone 2
- Auglaize County Zone 1
- Belmont County Zone 1
- Brown County Zone 2
- Butler County Zone 1
- Carroll County Zone 1
- Champaign County Zone 1
- Clark County Zone 1
- Clermont County Zone 2
- Clinton County Zone 1
- Columbiana County Zone 1
- Coshocton County Zone 1
- Crawford County Zone 1
- Cuyahoga County Zone 2
- Darke County Zone 1
- Defiance County Zone 2
- Delaware County Zone 1
- Erie County Zone 2
- Fairfield County Zone 1
- Fayette County Zone 1
- Franklin County Zone 1
- Fulton County Zone 2
- Gallia County Zone 2
- Geauga County Zone 2
- Greene County Zone 1
- Guernsey County Zone 1
- Hamilton County Zone 1
- Hancock County Zone 1
- Hardin County Zone 1
- Harrison County Zone 1
- Henry County Zone 2
- Highland County Zone 2
- Hocking County Zone 2
- Holmes County Zone 1
- Huron County Zone 1
- Jackson County Zone 2
- Jefferson County Zone 1
- Knox County Zone 1
- Lake County Zone 2
- Lawrence County Zone 2
- Licking County Zone 1
- Logan County Zone 1
- Lorain County Zone 2
- Lucas County Zone 2
- Madison County Zone 1
- Mahoning County Zone 2
- Marion County Zone 1
- Medina County Zone 2
- Meigs County Zone 2
- Mercer County Zone 1
- Miami County Zone 1
- Monroe County Zone 2
- Montgomery County Zone 1
- Morgan County Zone 2
- Morrow County Zone 1
- Muskingum County Zone 1
- Noble County Zone 2
- Ottawa County Zone 2
- Paulding County Zone 2
- Perry County Zone 1
- Pickaway County Zone 1
- Pike County Zone 1
- Portage County Zone 2
- Preble County Zone 1
- Putnam County Zone 2
- Richland County Zone 1
- Ross County Zone 1
- Sandusky County Zone 2
- Scioto County Zone 2
- Seneca County Zone 1
- Shelby County Zone 1
- Stark County Zone 1
- Summit County Zone 1
- Trumbull County Zone 2
- Tuscarawas County Zone 1
- Union County Zone 1
- Van Wert County Zone 1
- Vinton County Zone 2
- Warren County Zone 1
- Washington County Zone 2
- Wayne County Zone 1
- Williams County Zone 2
- Wood County Zone 2
- Wyandot County Zone 1
County not listed? See what we left out and why. Leave your email to hear if this data changes.