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Madison, WI sits on heavy lake-bed clay and has a cold humid continental climate with about 35" of precipitation a year. The local water table is higher near Lake Michigan, with severe winter freeze–thaw cycling, and older homes with full basements are the norm. In practical terms, harsh freeze–thaw and dense clay near the lake are especially hard on foundations — which is exactly why radon mitigation is a common need here.
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Madison sits on heavy lake-bed clay with a cold humid continental climate with about 35" of precipitation a year. Harsh freeze–thaw and dense clay near the lake are especially hard on foundations. That combination makes radon mitigation a recurring need for Madison homeowners.
Local projects typically run $850 – $3,150, tracking Madison-area labor and material prices. Difficult sites — for example where heavy lake-bed clay is severe — can run higher. Always compare at least two local quotes.
Most systems run $800–$3,000 depending on the home's foundation and layout. It's a one-time install that protects the whole home.
The EPA estimates about 1 in 15 U.S. homes has elevated radon, and it's often highest in the basement. Test first — if you're at or above 4 pCi/L, the EPA recommends fixing it.
A fan and pipe draw radon from beneath the slab and vent it safely above the roof, lowering indoor levels — usually within a day of installation.
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