EPA Zone Data 2026
Wisconsin Radon Map, Levels & Testing Guide
View EPA radon zone classifications for every county in Wisconsin. Open your county to compare basement test meaning, EPA action thresholds, and when mitigation pricing becomes worth checking.
28
Zone 1
High Risk
High Risk
44
Zone 2
Moderate
Moderate
0
Zone 3
Low Risk
Low Risk
Already Tested
View Wisconsin Cost Estimates
If you already have a radon result, skip the directory and move straight to local price guidance.
Need a Number First
Read the Testing Guide
Use the fastest valid radon test setup before you compare quotes or ask whether mitigation is worth it.
Browse Counties
Jump to the Directory
Open your county to see its EPA zone, testing meaning, and the point where mitigation becomes worth pricing.
Adams County
Zone 2
Ashland County
Zone 2
Barron County
Zone 2
Bayfield County
Zone 2
Brown County
Zone 2
Buffalo County
Zone 1
Burnett County
Zone 2
Calumet County
Zone 2
Chippewa County
Zone 2
Clark County
Zone 2
Columbia County
Zone 2
Crawford County
Zone 1
Dane County
Zone 1
Dodge County
Zone 1
Door County
Zone 1
Douglas County
Zone 2
Dunn County
Zone 2
Eau Claire County
Zone 2
Florence County
Zone 2
Fond du Lac County
Zone 1
Forest County
Zone 2
Grant County
Zone 1
Green County
Zone 1
Green Lake County
Zone 1
Iowa County
Zone 1
Iron County
Zone 2
Jackson County
Zone 2
Jefferson County
Zone 1
Juneau County
Zone 2
Kenosha County
Zone 2
Kewaunee County
Zone 2
La Crosse County
Zone 2
Lafayette County
Zone 1
Langlade County
Zone 1
Lincoln County
Zone 2
Manitowoc County
Zone 2
Marathon County
Zone 1
Marinette County
Zone 2
Marquette County
Zone 2
Menominee County
Zone 1
Milwaukee County
Zone 2
Monroe County
Zone 2
Oconto County
Zone 2
Oneida County
Zone 2
Outagamie County
Zone 2
Ozaukee County
Zone 2
Pepin County
Zone 1
Pierce County
Zone 1
Polk County
Zone 2
Portage County
Zone 1
Price County
Zone 2
Racine County
Zone 2
Richland County
Zone 1
Rock County
Zone 1
Rusk County
Zone 2
Sauk County
Zone 2
Sawyer County
Zone 2
Shawano County
Zone 1
Sheboygan County
Zone 2
St. Croix County
Zone 1
Taylor County
Zone 2
Trempealeau County
Zone 2
Vernon County
Zone 1
Vilas County
Zone 2
Walworth County
Zone 1
Washburn County
Zone 2
Washington County
Zone 1
Waukesha County
Zone 1
Waupaca County
Zone 1
Waushara County
Zone 2
Winnebago County
Zone 2
Wood County
Zone 1
Already tested? Get your itemized mitigation cost estimate.
View Wisconsin Mitigation Cost Estimates ->