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Badger State Radon

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 referral 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 low-cost test kits including lab analysis. Kit prices change, so check that page for current details. 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 send your request to 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.

Get a free quote from a Madison radon professional

Free and no obligation. Tell us your neighborhood or ZIP and your situation.

When you submit this form, your information is shared with the independent local radon professional we send your request to, for the purpose of following up on your radon testing or mitigation request.

What happens after you send the form

How fast will someone get back to me?
Calls and form submissions reach Compass Camper LLC directly. We read the request and pass it to an independent local radon mitigation contractor, usually within about an hour during the day. They then contact you to look at the house and price the work on their own schedule.

Frequently Asked Questions

Is radon a problem in Madison?

Yes. Dane County is EPA Radon Zone 1, the highest category, and WI DHS notes the county runs closer to one in five homes above the action level, higher than the statewide rate of about one in 10. Levels still vary house to house, so a Madison address is a reason to test, not to assume.

Where can I get a radon test in Madison?

Public Health Madison and Dane County serves as the local radon resource, and Wisconsin has 17 Radon Information Centers statewide that sell low-cost test kits including lab analysis. Kit prices change, so check the Wisconsin DHS radon information centers page for current details. You can also reach the state radon line at 1-888-LOW-RADON (1-888-569-7236). Winter is the best time to test in Wisconsin.

How much does radon mitigation cost in Madison?

Wisconsin DHS estimates a contractor-installed system typically costs $1,000 to $2,000 statewide, and Madison-area homes fall in that range depending on foundation type and system design. The professional we send your request to will quote your specific home. Ongoing cost is mainly the fan electricity.

Can you fix radon before a Madison home closes?

Often yes. A high radon test usually surfaces during the inspection contingency and leaves days, not weeks. Many systems install in a single day, which is why a quick quote matters. See our page on radon mitigation at a home sale for how the timing and negotiation usually work.

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