EPA radon zones
Wisconsin radon map: every county's zone
28 of Wisconsin's 72 counties are EPA radon zone 1 (predicted average above 4 pCi/L), 44 are zone 2 and 0 are zone 3. High readings occur in every zone, so EPA recommends testing every home.
Adams CountyZone 2
Ashland CountyZone 2
Barron CountyZone 2
Bayfield CountyZone 2
Brown CountyZone 2
Buffalo CountyZone 1
Burnett CountyZone 2
Calumet CountyZone 2
Chippewa CountyZone 2
Clark CountyZone 2
Columbia CountyZone 2
Crawford CountyZone 1
Dane CountyZone 1
Dodge CountyZone 1
Door CountyZone 1
Douglas CountyZone 2
Dunn CountyZone 2
Eau Claire CountyZone 2
Florence CountyZone 2
Fond du Lac CountyZone 1
Forest CountyZone 2
Grant CountyZone 1
Green CountyZone 1
Green Lake CountyZone 1
Iowa CountyZone 1
Iron CountyZone 2
Jackson CountyZone 2
Jefferson CountyZone 1
Juneau CountyZone 2
Kenosha CountyZone 2
Kewaunee CountyZone 2
La Crosse CountyZone 2
Lafayette CountyZone 1
Langlade CountyZone 1
Lincoln CountyZone 2
Manitowoc CountyZone 2
Marathon CountyZone 1
Marinette CountyZone 2
Marquette CountyZone 2
Menominee CountyZone 1
Milwaukee CountyZone 2
Monroe CountyZone 2
Oconto CountyZone 2
Oneida CountyZone 2
Outagamie CountyZone 2
Ozaukee CountyZone 2
Pepin CountyZone 1
Pierce CountyZone 1
Polk CountyZone 2
Portage CountyZone 1
Price CountyZone 2
Racine CountyZone 2
Richland CountyZone 1
Rock CountyZone 1
Rusk CountyZone 2
Sauk CountyZone 2
Sawyer CountyZone 2
Shawano CountyZone 1
Sheboygan CountyZone 2
St. Croix CountyZone 1
Taylor CountyZone 2
Trempealeau CountyZone 2
Vernon CountyZone 1
Vilas CountyZone 2
Walworth CountyZone 1
Washburn CountyZone 2
Washington CountyZone 1
Waukesha CountyZone 1
Waupaca CountyZone 1
Waushara CountyZone 2
Winnebago CountyZone 2
Wood 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.
Wisconsin cities: water and radon
Source: EPA Map of Radon Zones.