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San Jose, CA sits on widespread expansive clay soils and has a varied climate with wet winters and dry summers across much of the state. The local water table is variable by region, with minimal winter freeze–thaw cycling in most areas, and slab-on-grade dominates and basements are uncommon. In practical terms, expansive clay and seismic movement are the main foundation concerns — which is exactly why radon mitigation is a common need here.
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San Jose sits on widespread expansive clay soils with a varied climate with wet winters and dry summers across much of the state. Expansive clay and seismic movement are the main foundation concerns. That combination makes radon mitigation a recurring need for San Jose homeowners.
Local projects typically run $1,300 – $4,800, tracking San Jose-area labor and material prices. Difficult sites — for example where widespread expansive clay soils 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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