EPA Zone Data 2026
WI Radon Levels
View EPA radon zone classifications for every county in WI. Select your county to see detailed risk data, testing recommendations, and mitigation cost estimates.
28
Zone 1
High Risk
High Risk
44
Zone 2
Moderate
Moderate
0
Zone 3
Low Risk
Low Risk
Adams
Zone 2
Ashland
Zone 2
Barron
Zone 2
Bayfield
Zone 2
Brown
Zone 2
Buffalo
Zone 1
Burnett
Zone 2
Calumet
Zone 2
Chippewa
Zone 2
Clark
Zone 2
Columbia
Zone 2
Crawford
Zone 1
Dane
Zone 1
Dodge
Zone 1
Door
Zone 1
Douglas
Zone 2
Dunn
Zone 2
Eau Claire
Zone 2
Florence
Zone 2
Fond du Lac
Zone 1
Forest
Zone 2
Grant
Zone 1
Green
Zone 1
Green Lake
Zone 1
Iowa
Zone 1
Iron
Zone 2
Jackson
Zone 2
Jefferson
Zone 1
Juneau
Zone 2
Kenosha
Zone 2
Kewaunee
Zone 2
La Crosse
Zone 2
Lafayette
Zone 1
Langlade
Zone 1
Lincoln
Zone 2
Manitowoc
Zone 2
Marathon
Zone 1
Marinette
Zone 2
Marquette
Zone 2
Menominee
Zone 1
Milwaukee
Zone 2
Monroe
Zone 2
Oconto
Zone 2
Oneida
Zone 2
Outagamie
Zone 2
Ozaukee
Zone 2
Pepin
Zone 1
Pierce
Zone 1
Polk
Zone 2
Portage
Zone 1
Price
Zone 2
Racine
Zone 2
Richland
Zone 1
Rock
Zone 1
Rusk
Zone 2
Sauk
Zone 2
Sawyer
Zone 2
Shawano
Zone 1
Sheboygan
Zone 2
St. Croix
Zone 1
Taylor
Zone 2
Trempealeau
Zone 2
Vernon
Zone 1
Vilas
Zone 2
Walworth
Zone 1
Washburn
Zone 2
Washington
Zone 1
Waukesha
Zone 1
Waupaca
Zone 1
Waushara
Zone 2
Winnebago
Zone 2
Wood
Zone 1
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