EPA Zone Data 2026
OH Radon Levels
View EPA radon zone classifications for every county in OH. Select your county to see detailed risk data, testing recommendations, and mitigation cost estimates.
53
Zone 1
High Risk
High Risk
35
Zone 2
Moderate
Moderate
0
Zone 3
Low Risk
Low Risk
Adams
Zone 1
Allen
Zone 1
Ashland
Zone 1
Ashtabula
Zone 2
Athens
Zone 2
Auglaize
Zone 1
Belmont
Zone 1
Brown
Zone 2
Butler
Zone 1
Carroll
Zone 1
Champaign
Zone 1
Clark
Zone 1
Clermont
Zone 2
Clinton
Zone 1
Columbiana
Zone 1
Coshocton
Zone 1
Crawford
Zone 1
Cuyahoga
Zone 2
Darke
Zone 1
Defiance
Zone 2
Delaware
Zone 1
Erie
Zone 2
Fairfield
Zone 1
Fayette
Zone 1
Franklin
Zone 1
Fulton
Zone 2
Gallia
Zone 2
Geauga
Zone 2
Greene
Zone 1
Guernsey
Zone 1
Hamilton
Zone 1
Hancock
Zone 1
Hardin
Zone 1
Harrison
Zone 1
Henry
Zone 2
Highland
Zone 2
Hocking
Zone 2
Holmes
Zone 1
Huron
Zone 1
Jackson
Zone 2
Jefferson
Zone 1
Knox
Zone 1
Lake
Zone 2
Lawrence
Zone 2
Licking
Zone 1
Logan
Zone 1
Lorain
Zone 2
Lucas
Zone 2
Madison
Zone 1
Mahoning
Zone 2
Marion
Zone 1
Medina
Zone 2
Meigs
Zone 2
Mercer
Zone 1
Miami
Zone 1
Monroe
Zone 2
Montgomery
Zone 1
Morgan
Zone 2
Morrow
Zone 1
Muskingum
Zone 1
Noble
Zone 2
Ottawa
Zone 2
Paulding
Zone 2
Perry
Zone 1
Pickaway
Zone 1
Pike
Zone 1
Portage
Zone 2
Preble
Zone 1
Putnam
Zone 2
Richland
Zone 1
Ross
Zone 1
Sandusky
Zone 2
Scioto
Zone 2
Seneca
Zone 1
Shelby
Zone 1
Stark
Zone 1
Summit
Zone 1
Trumbull
Zone 2
Tuscarawas
Zone 1
Union
Zone 1
Van Wert
Zone 1
Vinton
Zone 2
Warren
Zone 1
Washington
Zone 2
Wayne
Zone 1
Williams
Zone 2
Wood
Zone 2
Wyandot
Zone 1
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