Madison, WI Radon Levels

Q: What EPA Radon Zone is Madison in?

Madison is in Dane County, EPA Zone 1.

Q: How much does radon mitigation cost in Madison?

Radon mitigation typically costs between $800 and $2,000. Most standard systems fall in the $1,000-$1,500 range.

Check local Madison radon levels and find certified testing and mitigation professionals to keep your home safe

Madison, WI Radon Facts

EPA Radon Zone Zone 1 — High Risk > 4.0 pCi/L (Zone 1)

County Dane County, WI

Zip Code 53703

Wisconsin's capital city Madison spans Dane County where glacial deposits over sandstone and limestone bedrock create variable radon conditions across neighborhoods throughout the Madison Metro area. Although testing data for zip code 53703 is currently limited, Wisconsin's geological conditions make radon testing important for homeowners. The city's diverse housing stock, from historic near-campus properties to modern suburban developments, all benefit from professional radon assessment given the area's radon potential.

9.75

pCi/L area average

Above EPA Action Level

Dane County average: 9.75 pCi/L, based on 8 user-submitted tests across 7 cities in the county. No homeowner readings have been submitted for Madison itself yet, so this county figure is the closest available benchmark. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Madison, WI Radon Mitigation

Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.

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Radon Readings Near Madison, WI

No homeowner tests have been submitted for Madison yet. The closest cities with user-submitted radon data are shown below — explore them to gauge local conditions. Radon varies by home, so testing is the only way to know your level.

City	Distance	Avg User Level	Readings
Middleton	5.8 mi	4.00 pCi/L	1
Mc Farland	6.8 mi	9.00 pCi/L	1
Waunakee	8.1 mi	5.50 pCi/L	2
Verona	9.0 mi	18.00 pCi/L	1
Oregon	9.8 mi	12.00 pCi/L	1
Mount Horeb	17.8 mi	9.00 pCi/L	1
Arlington	17.8 mi	6.00 pCi/L	1
New Glarus	21.5 mi	7.00 pCi/L	1

Dane County Radon Profile

Dane County falls in EPA Radon Zone 1, meaning the local uranium-bearing geology is predicted to drive average indoor radon screening levels above the EPA's 4 pCi/L action threshold. Homeowner-submitted tests from 7 cities in Dane County average 9.75 pCi/L across 8 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. Since radon is the second leading cause of lung cancer nationally, the EPA urges every household in Dane County to test, as levels can differ between neighboring homes.

Radon FAQ for Madison, WI

What EPA Radon Zone is Madison in?

Madison and the 53703 zip code are in Dane County, which has an EPA assigned Radon Zone of 1. A zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L.

Why are radon readings shown from areas near Madison?

No homeowner radon tests have been submitted for Madison yet. Because radon is driven by regional soil and bedrock geology, readings from the closest cities—and the Dane County average—are the best available indicator of local conditions until Madison homeowners submit their own results. The EPA still recommends testing every individual home, since levels can vary significantly from house to house.

How much does radon mitigation cost in Madison?

Radon mitigation in Madison typically costs between $800 and $2,000. Most homes with standard basements can be mitigated with a sub-slab depressurization system in the $1,000–$1,500 range. Factors that can increase cost include complex foundations, crawl spaces, or very high radon levels.

Should I test for radon if I'm buying a home in Madison?

Yes. Radon testing should be part of every home purchase. A short-term radon test is typically included as part of the home inspection process and costs $150–$250. If elevated levels are found, you can negotiate mitigation as part of the sale.