Wisconsin Radon Mitigation Cost by County, Foundation, and Rules
Compare typical local price ranges for basement, slab, and crawl space systems. Use the state-level ranges first, then open your county when you need a local estimate after a confirmed radon result.
Fastest Start
Use ZIP Instead of Scrolling
If you know the property ZIP, jump straight to the right county estimate instead of browsing the full state list.
Cost Basics
Foundation & Result Ranges
Use the national cost guide if you need basement, slab, crawl-space, or 4.0+ result context first.
Validate the Risk
Check WI Radon Levels
If you do not have a confirmed radon result yet, review EPA zone context before you compare mitigation pricing.
Browse Counties
Jump to County Pricing
Open your county if you already know the area and just need a local basement, slab, or crawl-space price range.
Official State Resource
Wisconsin radon program and rules
Use the state program link to verify local radon guidance, disclosure language, and contractor credential expectations before you act on an estimate.
Disclosure rule tracked
Wisconsin requires sellers to complete a Real Estate Condition Report that includes known radon test results and environmental hazards.
Credential note
Wisconsin does not require specific radon licensing. NRPP or AARST certification is recommended.
WI Cost Starting Point
Wisconsin cost range by foundation
Basement
$875-$1558
Use this when the home has a basement or lowest-level slab that supports a standard sub-slab suction system.
Slab-on-Grade
$828-$1463
Slab homes can price differently when finished space, routing, or core drilling complicates the system path.
Crawl Space
$1370-$2500
Crawl-space jobs can move higher when vapor-barrier sealing, access, and sub-membrane suction add labor.
State rules that can change the quote
Disclosure: Required or commonly expected in this state context. Wisconsin requires sellers to complete a Real Estate Condition Report that includes known radon test results and environmental hazards.
Mitigation licensing: No state-specific mitigation license premium is modeled. Wisconsin does not require specific radon licensing. NRPP or AARST certification is recommended.
EPA zone mix in Wisconsin
28
Zone 1
44
Zone 2
0
Zone 3
72 classified counties are used for state-level risk context. EPA zones do not replace a home test, but they help explain why county pages and confirmed 4.0+ results matter before comparing quotes.
Local cost guides
Wisconsin evidence-backed cost route
The cost directory follows the same eligibility rule as the county cost pages themselves. State hubs, sitemap candidates, and internal links point at pages Google can actually index.
72
Listed
72
Evidence
72
Measured
Best county pages to open first
Milwaukee County
Evidence-backed local evidence
$875-$1558
Wisconsin Health Dept. Services Indoor Radon Test Results: 48.9% 4.0+
Milwaukee County is a strong cost page because it pairs Wisconsin Health Dept. Services Indoor Radon Test Results: 48.9% 4.0+ with a local housing base of 423,764 units and a modeled planning range of $875-$1558.
Dane County
Evidence-backed local evidence
$875-$1558
Wisconsin Health Dept. Services Indoor Radon Test Results: 50.9% 4.0+
Dane County is a strong cost page because it pairs Wisconsin Health Dept. Services Indoor Radon Test Results: 50.9% 4.0+ with a local housing base of 250,416 units and a modeled planning range of $875-$1558.
Waukesha County
Evidence-backed local evidence
$875-$1558
Wisconsin Health Dept. Services Indoor Radon Test Results: 62% 4.0+
Waukesha County is a strong cost page because it pairs Wisconsin Health Dept. Services Indoor Radon Test Results: 62% 4.0+ with a local housing base of 172,274 units and a modeled planning range of $875-$1558.
Brown County
Evidence-backed local evidence
$875-$1558
Wisconsin Health Dept. Services Indoor Radon Test Results: 51.7% 4.0+
Brown County is a strong cost page because it pairs Wisconsin Health Dept. Services Indoor Radon Test Results: 51.7% 4.0+ with a local housing base of 113,199 units and a modeled planning range of $875-$1558.
Racine County
Evidence-backed local evidence
$875-$1558
Wisconsin Health Dept. Services Indoor Radon Test Results: 57.2% 4.0+
Racine County is a strong cost page because it pairs Wisconsin Health Dept. Services Indoor Radon Test Results: 57.2% 4.0+ with a local housing base of 84,455 units and a modeled planning range of $875-$1558.
Outagamie County
Evidence-backed local evidence
$875-$1558
Wisconsin Health Dept. Services Indoor Radon Test Results: 49.8% 4.0+
Outagamie County is a strong cost page because it pairs Wisconsin Health Dept. Services Indoor Radon Test Results: 49.8% 4.0+ with a local housing base of 79,305 units and a modeled planning range of $875-$1558.
Winnebago County
Evidence-backed local evidence
$875-$1558
Wisconsin Health Dept. Services Indoor Radon Test Results: 53.5% 4.0+
Winnebago County is a strong cost page because it pairs Wisconsin Health Dept. Services Indoor Radon Test Results: 53.5% 4.0+ with a local housing base of 76,371 units and a modeled planning range of $875-$1558.
Kenosha County
Evidence-backed local evidence
$875-$1558
Wisconsin Health Dept. Services Indoor Radon Test Results: 50.1% 4.0+
Kenosha County is a strong cost page because it pairs Wisconsin Health Dept. Services Indoor Radon Test Results: 50.1% 4.0+ with a local housing base of 72,447 units and a modeled planning range of $875-$1558.
Rock County
Evidence-backed local evidence
$875-$1558
Wisconsin Health Dept. Services Indoor Radon Test Results: 5.5% 4.0+
Rock County is a strong cost page because it pairs Wisconsin Health Dept. Services Indoor Radon Test Results: 5.5% 4.0+ with a local housing base of 70,230 units and a modeled planning range of $875-$1558.
Marathon County
Evidence-backed local evidence
$875-$1558
Wisconsin Health Dept. Services Indoor Radon Test Results: 67% 4.0+
Marathon County is a strong cost page because it pairs Wisconsin Health Dept. Services Indoor Radon Test Results: 67% 4.0+ with a local housing base of 59,980 units and a modeled planning range of $875-$1558.
Washington County
Evidence-backed local evidence
$875-$1558
Wisconsin Health Dept. Services Indoor Radon Test Results: 58.4% 4.0+
Washington County is a strong cost page because it pairs Wisconsin Health Dept. Services Indoor Radon Test Results: 58.4% 4.0+ with a local housing base of 58,391 units and a modeled planning range of $875-$1558.
Walworth County
Evidence-backed local evidence
$875-$1558
Wisconsin Health Dept. Services Indoor Radon Test Results: 59.2% 4.0+
Walworth County is a strong cost page because it pairs Wisconsin Health Dept. Services Indoor Radon Test Results: 59.2% 4.0+ with a local housing base of 53,231 units and a modeled planning range of $875-$1558.
La Crosse County
Evidence-backed local evidence
$875-$1558
Wisconsin Health Dept. Services Indoor Radon Test Results: 38.7% 4.0+
La Crosse County is a strong cost page because it pairs Wisconsin Health Dept. Services Indoor Radon Test Results: 38.7% 4.0+ with a local housing base of 52,777 units and a modeled planning range of $875-$1558.
Sheboygan County
Evidence-backed local evidence
$875-$1558
Wisconsin Health Dept. Services Indoor Radon Test Results: 55.1% 4.0+
Sheboygan County is a strong cost page because it pairs Wisconsin Health Dept. Services Indoor Radon Test Results: 55.1% 4.0+ with a local housing base of 52,375 units and a modeled planning range of $875-$1558.
Fond du Lac County
Evidence-backed local evidence
$875-$1558
Wisconsin Health Dept. Services Indoor Radon Test Results: 55.7% 4.0+
Fond du Lac County is a strong cost page because it pairs Wisconsin Health Dept. Services Indoor Radon Test Results: 55.7% 4.0+ with a local housing base of 45,711 units and a modeled planning range of $875-$1558.
Eau Claire County
Evidence-backed local evidence
$875-$1558
Wisconsin Health Dept. Services Indoor Radon Test Results: 40.9% 4.0+
Eau Claire County is a strong cost page because it pairs Wisconsin Health Dept. Services Indoor Radon Test Results: 40.9% 4.0+ with a local housing base of 45,241 units and a modeled planning range of $875-$1558.
Ozaukee County
Evidence-backed local evidence
$875-$1558
Wisconsin Health Dept. Services Indoor Radon Test Results: 49.5% 4.0+
Ozaukee County is a strong cost page because it pairs Wisconsin Health Dept. Services Indoor Radon Test Results: 49.5% 4.0+ with a local housing base of 39,120 units and a modeled planning range of $875-$1558.
Dodge County
Evidence-backed local evidence
$875-$1558
Wisconsin Health Dept. Services Indoor Radon Test Results: 61.1% 4.0+
Dodge County is a strong cost page because it pairs Wisconsin Health Dept. Services Indoor Radon Test Results: 61.1% 4.0+ with a local housing base of 38,150 units and a modeled planning range of $875-$1558.
Manitowoc County
Demand cohort local evidence
$875-$1558
Wisconsin Health Dept. Services Indoor Radon Test Results: 35.7% 4.0+
Manitowoc County is a strong cost page because it pairs Wisconsin Health Dept. Services Indoor Radon Test Results: 35.7% 4.0+ with a local housing base of 37,821 units and a modeled planning range of $875-$1558.
St. Croix County
Evidence-backed local evidence
$875-$1558
Wisconsin Health Dept. Services Indoor Radon Test Results: 54.2% 4.0+
St. Croix County is a strong cost page because it pairs Wisconsin Health Dept. Services Indoor Radon Test Results: 54.2% 4.0+ with a local housing base of 37,640 units and a modeled planning range of $875-$1558.
County estimates
Open a Wisconsin county page for local pricing
County pages narrow the state range with local EPA zone context, housing data, state rules, and the foundation scenario you choose.
Why Does Cost Vary in Wisconsin?
Price ranges across Wisconsin move with local labor rates, permit friction, roofline routing, and foundation type. County pages narrow this down for homeowners comparing basement, slab, or crawl space mitigation after a confirmed radon reading.