Radon Mitigation in Madison, WI
Madison sits in Dane County, which the EPA places in Radon Zone 1, the higher of the two EPA categories that apply in Wisconsin (predicted average indoor level at or above 4 pCi/L). Wisconsin DHS notes Dane County runs closer to one in five homes above the action level, higher than the statewide rate of about one in 10. Whether a high test just surfaced during a home sale or you are planning ahead after a cold-weather reading, Badger State Radon connects Madison homeowners with independent local radon professionals. We are a free matching service, not a contractor, and this page lays out what radon looks like here and what to do about it.
Radon in Madison and Dane County
Dane County is EPA Radon Zone 1, the higher of the two EPA categories that apply in Wisconsin (predicted average indoor level at or above 4 pCi/L), cited to the EPA Map of Radon Zones. The housing stock is a mix of older near-campus and isthmus homes and newer suburban construction, most with full basements, and older and newer homes alike can test high because radon is driven by the soil underneath, not the age of the house. Zone is a countywide screening designation, so your street and even your next-door neighbor can differ. The reliable move is to test your own home. You can check area results on the WI DHS radon results map.
Testing your Madison home
Public Health Madison and Dane County serves as the area radon resource, and statewide 17 Radon Information Centers offer kits for about $15 including lab analysis. A short-term charcoal test takes just a few days, which suits a sale, while a long-term test gives a better year-round average. Winter is peak testing season here, since closed-up homes let radon build. If a short-term test is at or above 4.0 pCi/L, the EPA recommends confirming with a follow-up test. See radon testing for the full rundown.
Mitigation and cost
If your level is high, the common fix is active sub-slab depressurization: a pipe and a continuously running fan that vents radon above the roofline. Wisconsin DHS estimates a system typically costs $1,000 to $2,000, and Madison homes fall in that range by foundation and design. Learn how systems work on the radon mitigation page, and see the cost guide for the breakdown. The independent professionals we match you with can hold the voluntary NRPP or NRSB credentials; we do not perform the work or hold any certification ourselves.
Radon and a Madison home sale
In a Dane County transaction, radon is usually tested during the inspection contingency, and a high result moves fast. Systems often install within a few days, and who pays is negotiable between buyer and seller. Our page on radon mitigation at a home sale covers the Wisconsin disclosure and timing. For the statewide picture, the Wisconsin radon guide ties it all together.