Radon Mitigation in Green Bay, WI
Green Bay anchors Brown County in northeastern Wisconsin, home to bay-area neighborhoods with a broad mix of housing ages. The EPA places Brown County in Radon Zone 2 (predicted average indoor level of 2 to 4 pCi/L). Every Wisconsin county is EPA Radon Zone 1 or Zone 2. The state has no Zone 3 county. Whether a reading just came back after a cold-weather test or a home sale put radon on the inspection list, Badger State Radon connects Green Bay 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 Green Bay and Brown County
Brown County is EPA Radon Zone 2 (predicted average indoor level of 2 to 4 pCi/L), cited to the EPA Map of Radon Zones. Zone 2 is the lower of the two designations found in Wisconsin, but it is not a clean bill of health: WI DHS reports that statewide about one in 10 Wisconsin homes is above 4.0 pCi/L, and levels swing house to house because radon rises from the soil under each foundation. Older near-downtown homes and newer subdivisions alike can read high. Zone is a countywide screening estimate, so your street, and even your next-door neighbor, can differ from the county average. You can check area readings on the WI DHS radon results map. The dependable step is to test your own home.
Testing your Green Bay home
The regional Radon Information Center serves Brown County, and statewide 17 Radon Information Centers offer kits for about $15 including lab analysis. A short-term charcoal test runs a few days and fits a sale timeline, while a long-term test gives a better year-round average. Winter is peak testing season in northeastern Wisconsin, since closed-up homes let radon accumulate. If a short-term test comes back at or above 4.0 pCi/L, the EPA recommends confirming with a follow-up test. See radon testing for the full walkthrough.
Mitigation and cost
When a level is high, the common fix is active sub-slab depressurization: a pipe and a continuously running fan that draw radon from beneath the slab and vent it above the roofline. Wisconsin DHS estimates a contractor-installed system typically costs $1,000 to $2,000, and Green Bay homes fall in that range depending on foundation type and layout. Sealing cracks alone is not a fix. Learn how these systems work on the radon mitigation page. 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 Green Bay home sale
In a Brown County transaction, radon usually gets tested during the inspection contingency, and a high result moves on a short clock, days rather than weeks. Many systems install within a few days, which is why a quick match helps, and who pays is negotiable between buyer and seller. Our page on radon mitigation at a home sale covers the Wisconsin disclosure and timing, and the Wisconsin radon guide ties the statewide picture together.