Now: freeze-up. Pour before the ground freezes; clear the gutters once the leaves are down.

The Wisconsin year

EPA radon zones (1993 map)

Wisconsin radon zones by county

EPA radon zone for every Wisconsin county, with the EPA's own wording on what a zone means. Test your own home: a county zone is an average, not a reading.

A radon mitigation pipe rising from a sealed basement floor

Test your own home

EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").

Read the radon guide

What the zones mean

  • Zone 1. Highest potential. Counties have a predicted average indoor screening level greater than 4 pCi/L.
  • Zone 2. Moderate potential. Predicted average indoor screening level of 2 to 4 pCi/L (>= 2 and <= 4).
  • Zone 3. Low potential. Predicted average below 2 pCi/L. No Wisconsin county is Zone 3.

EPA radon zones (1993 map)

Radon by county, all 72

A zone is the EPA’s predicted county average. It says nothing certain about one house: test your own home.

EPA radon zone by Wisconsin county (1993 map), grouped by region (our grouping)
CountyEPA zonePredicted county average
Up Northyour region
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 1: highest potential > 4 pCi/L
Predicted county average
> 4 pCi/L
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 1: highest potential > 4 pCi/L
Predicted county average
> 4 pCi/L
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 1: highest potential > 4 pCi/L
Predicted county average
> 4 pCi/L
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 1: highest potential > 4 pCi/L
Predicted county average
> 4 pCi/L
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Northeast & Lakeshoreyour region
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 1: highest potential > 4 pCi/L
Predicted county average
> 4 pCi/L
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 1: highest potential > 4 pCi/L
Predicted county average
> 4 pCi/L
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 1: highest potential > 4 pCi/L
Predicted county average
> 4 pCi/L
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Fox Valleyyour region
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 1: highest potential > 4 pCi/L
Predicted county average
> 4 pCi/L
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 1: highest potential > 4 pCi/L
Predicted county average
> 4 pCi/L
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 1: highest potential > 4 pCi/L
Predicted county average
> 4 pCi/L
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Southeastyour region
Zone 1: highest potential > 4 pCi/L
Predicted county average
> 4 pCi/L
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 1: highest potential > 4 pCi/L
Predicted county average
> 4 pCi/L
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 1: highest potential > 4 pCi/L
Predicted county average
> 4 pCi/L
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 1: highest potential > 4 pCi/L
Predicted county average
> 4 pCi/L
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
South Centralyour region
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 1: highest potential > 4 pCi/L
Predicted county average
> 4 pCi/L
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 1: highest potential > 4 pCi/L
Predicted county average
> 4 pCi/L
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 1: highest potential > 4 pCi/L
Predicted county average
> 4 pCi/L
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 1: highest potential > 4 pCi/L
Predicted county average
> 4 pCi/L
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Driftless & Westyour region
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 1: highest potential > 4 pCi/L
Predicted county average
> 4 pCi/L
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 1: highest potential > 4 pCi/L
Predicted county average
> 4 pCi/L
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 1: highest potential > 4 pCi/L
Predicted county average
> 4 pCi/L
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 1: highest potential > 4 pCi/L
Predicted county average
> 4 pCi/L
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 1: highest potential > 4 pCi/L
Predicted county average
> 4 pCi/L
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 1: highest potential > 4 pCi/L
Predicted county average
> 4 pCi/L
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 1: highest potential > 4 pCi/L
Predicted county average
> 4 pCi/L
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 1: highest potential > 4 pCi/L
Predicted county average
> 4 pCi/L
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 1: highest potential > 4 pCi/L
Predicted county average
> 4 pCi/L
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 2: moderate potential 2 to 4 pCi/L (>= 2 and <= 4)
Predicted county average
2 to 4 pCi/L (>= 2 and <= 4)
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").
Zone 1: highest potential > 4 pCi/L
Predicted county average
> 4 pCi/L
Read
Oct 16, 2026
Your house
Test your own home. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L, and testing in every zone ("All homes should be tested, regardless of zone designation").

Source: U.S. EPA, "Wisconsin - EPA Map of Radon Zones" (state PDF of the 1993 Map of Radon Zones; the PDF on epa.gov was last modified 2025-05-02). Read by eye from the map and dated Oct 16, 2026. The Wisconsin DHS publishes measured test results as a map only; we link it instead of copying it: DHS radon map.

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