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Badger State Radon

Radon Mitigation in Janesville, WI

Janesville anchors Rock County in south-central Wisconsin, where the Rock River runs past a downtown lined with older homes and where newer subdivisions have spread toward the edges of the city. The EPA places Rock County 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). Whether you are relocating into the area, listing a house, or just settling in after a move, Badger State Radon connects Janesville 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 a reading.

Radon in Janesville and Rock County

Rock 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 local housing stock is a range of older near-downtown homes and newer subdivisions along the Rock River, and older and newer homes alike can test high because radon is driven by the soil beneath the foundation, not the age of the house. Zone 1 is a county-wide screening prediction, so your street and even your next-door neighbor can differ. Statewide, WI DHS reports that about one in 10 Wisconsin homes tests above the action level, and readings vary widely from address to address. Rather than lean on any single county figure, check how homes near you have actually tested on the WI DHS radon results map, which breaks reported results down to the ZIP level. The reliable move is still to test your own home.

Testing your Janesville home

For Janesville and the surrounding area, the regional Radon Information Center serves Rock County, 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 pending 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 comes back at or above 4.0 pCi/L, the EPA recommends confirming with a follow-up test. You can also reach the state radon line at 1-888-LOW-RADON (1-888-569-7236). See radon testing for the full rundown on kits, timing, and closed-building conditions.

Mitigation and cost

If your level is high, the common fix is active sub-slab depressurization: a pipe and a continuously running fan that draws radon from under the slab and vents it above the roofline. Sealing cracks alone is not a complete fix. Wisconsin DHS estimates a contractor-installed system typically costs $1,000 to $2,000, and Janesville homes fall in that range depending on foundation type and system design, with ongoing cost mainly the a few dollars a month fan electricity. Learn how systems work on the radon mitigation page, and see the Wisconsin 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 Janesville home sale

Janesville is a common relocation and home-sale market, and in a Rock County transaction radon is usually tested during the inspection contingency. A high result moves fast: it tends to leave days, not weeks, before closing, 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 how the timing usually plays out. For the statewide picture, from action levels to county zones, the Wisconsin radon guide ties it all together. If a test just came back high or a deadline is bearing down, a quick get a free quote from a local professional is the fastest way forward.

Get a free quote from a Janesville 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

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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 high in Janesville and Rock County?

Rock County is EPA Radon Zone 1, the highest screening category, which means the predicted average indoor level is at or above the 4.0 pCi/L action level. That is a county-wide prediction, not a guarantee for any single home. Levels vary street to street and house to house, so a Janesville address is a reason to test rather than to assume a number.

How do I check radon results for my ZIP code?

WI DHS publishes a radon results map that breaks reported test results down by area, so you can see how homes near your Janesville ZIP have tested. Treat it as a screening reference, not a substitute for testing your own home. Pair it with a short-term or long-term test at your address to learn your actual level.

What happens with radon during a Janesville home sale?

Janesville sees steady relocation and resale activity, and radon usually comes up during the inspection contingency. A high result tends to leave days, not weeks, before closing. Many systems 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.

Where can I get a radon test near Janesville?

For the area, the regional Radon Information Center serves Rock County, 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, when closed-up homes let radon build.

Sources

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