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Milwaukee Metro, WI Radon Information

The Milwaukee Metro metropolitan area in Wisconsin has a regional average radon level of 8.8 pCi/L based on 20 user-submitted tests. This exceeds the EPA’s recommended action level of 4.0 pCi/L, meaning radon testing and professional mitigation should be a priority for homeowners across the region.

Radon is a naturally occurring radioactive gas produced by the decay of uranium in soil and bedrock. In the Milwaukee Metro area, local geology and common residential construction—particularly homes with basements and crawlspaces—allow radon to seep indoors and accumulate to dangerous concentrations. Particularly high readings have been recorded in communities like Milwaukee, Oak Creek, Menomonee Falls, where professional radon testing and mitigation services are strongly recommended.

Whether you are buying a home, selling a property, or simply want to protect your family, a professional radon test is the only way to know your home’s levels. If elevated radon is found, a licensed mitigation contractor can install a sub-slab depressurization system—typically in one day—to reduce levels by up to 99%. Request a free radon mitigation quote

The regional average is 8.8 pCi/L — above the EPA action level of 4.0 pCi/L. Testing and mitigation are strongly recommended.
8.8
Avg. pCi/L
14
Cities
20
User Tests
Zone 1
EPA Rating
Above EPA Action Level
Below EPA Action Level

Top 5 Radon Hotspots in the Milwaukee Metro Area

Cities with the highest average user-submitted radon readings in the Milwaukee Metro metropolitan area.

Rank City Avg. Radon Level Tests
1 Milwaukee
10.00 pCi/L
3
2 Oak Creek
8.30 pCi/L
3
3 Menomonee Falls
6.50 pCi/L
2
4 Waukesha
5.50 pCi/L
2
5 Slinger
20.00 pCi/L
1

Other Metro Areas in Wisconsin

Explore radon data for other metropolitan regions across the state.

Appleton Metro
View radon data
Duluth Metro
View radon data
Eau Claire Metro
View radon data
Green Bay Metro
View radon data
Janesville Metro
View radon data
Kenosha Metro
View radon data
La Crosse Metro
View radon data
Madison Metro
View radon data
Minneapolis-St. Paul Metro
View radon data
Oshkosh Metro
View radon data
Racine Metro
View radon data

Cities in the Milwaukee Metro Area

14 cities and towns in the Milwaukee Metro metropolitan area with user-submitted radon data.

14 cities

Radon Mitigation Professionals Serving the Milwaukee Metro Area

Licensed contractors who serve this metro area.

Company
Accurate Radon Mitigation Systems Inc
Advanced Radon Management Co
Anderson Home Inspection LLC
Becker Bros. Radon LLC
Beeck Home Inspections LLC
First Look Home Inspection Services S.C.
Freedom Radon Solutions LLC
H.I.S. Corporation
Home Inspections Plus LLC
Impeccable Home Inspections LLC
Kebbekus Radon Testing LLC
Kinship Mitigation Service
Lifetime Radon Solutions
Lifetime Radon Solutions Inc
M2 Certified Radon Services
Next Horizon Home Inspections Inc
Patriot Plumbing Inc
Radon Abatement
Radon Busters LLC
Radon Doctors LLC
Radon Measurement & Elimination Services
Radon Problem Solvers
Radon Remediation Specialists
Radon Rescue and Testing
Radon Rescuers LLC
Radon Specialists of WI
Right Angle Home Inspections
Stonehenge Development Inc
SWAT Holdings LLC
The Sigma Group Inc
Washington Health Dept
Waukesha Brookfield Milwaukee Radon Mitigation Systems
Waukesha County - Environmental Health Division

Frequently Asked Questions about Radon in the Milwaukee Metro Area

Common questions about radon testing, mitigation costs, and health risks for homeowners in the Milwaukee Metro metropolitan area.

Why are radon levels so high in the Milwaukee Metro area?
Radon levels in the Milwaukee Metro area are driven by the local soil and bedrock composition, which contains naturally occurring uranium. As uranium decays, it produces radon gas that migrates upward through the soil and enters homes through foundation cracks, sump pits, and gaps around pipes. Homes with basements and crawlspaces are especially susceptible because these below-grade spaces are in direct contact with the soil where radon concentrations are highest.
How much does radon mitigation cost in Milwaukee Metro?
Professional radon mitigation in the Milwaukee Metro metropolitan area typically costs between $800 and $2,500, depending on the size and construction of your home. The most common approach is an active sub-slab depressurization system, which a certified contractor can usually install in a single day. Ongoing energy costs for the mitigation fan are minimal—roughly $5–$10 per month—and most systems reduce radon levels by 90% or more.
Are landlords in Wisconsin required to test for radon?
Radon testing and disclosure requirements vary by state and municipality. Some Wisconsin jurisdictions require landlords to disclose known radon levels or test results, while others have no mandate. Regardless of local law, the EPA recommends radon testing for all residential properties—including rentals—since radon is the second leading cause of lung cancer in the United States.
Can I sell a house with high radon levels in the Milwaukee Metro area?
Yes. High radon levels do not prevent a home sale, but buyers in the Milwaukee Metro market routinely request radon testing during the inspection period. If levels exceed 4.0 pCi/L, the buyer may negotiate for the seller to install a mitigation system before closing. Having a radon mitigation system already in place can actually be a selling point, demonstrating proactive home maintenance and providing documented proof of safe indoor air quality.