Radon California
Verified Pro
11 years online5.0(13)
Radon Mitigation in San Jose, CA
Compare 29 radon mitigation contractors near you in San Jose and surrounding area with an average rating of 4.7/5. Get free quotes, read reviews, and find the right pro for your project.
Last updated March 23, 2026
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Other Businesses in This Area
911 Restoration of San Jose
5.010½+ years onlineMoldTeam Inspection
5.0Reactic Restoration
5.04+ years onlineSJ Mold Removal
5.010½+ years onlineAttic Bros, Inc.
4.9~7 years onlineAttic Crew
4.99½+ years onlineBluSky Restoration Contractors
4.922 years onlineCalPro Inspection Group - Home & Commercial Inspectors
4.98+ years onlineMG Remediation
4.921+ years onlineRescue Air Service Inc.
4.918+ years onlineThe Water Damage Experts, Incorporated
4.921+ years onlineZGREEN Restoration
4.99 years onlineKennedy
4.7Restoration Management Company
4.731 years onlineRadon Solutions California LLC
4.48½+ years onlineAlliance Environmental Group
3.628 years onlineBenchmark Environmental
3.020+ years onlineRadon Mitigation in Nearby CA Cities
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Radon Mitigation in San Jose, CA
San Jose radon mitigation is sometimes needed in homes built on the Monte Sereno and West Valley foothills where granite and serpentine bedrock can produce elevated radon. EPA Zone 2 (moderate potential) covers most of Santa Clara County, but high readings show up in 5-10% of homes tested. Slab-on-grade construction common here means sub-slab depressurization is the standard mitigation — a single passive vent stack with inline fan typically gets readings below 4 pCi/L. NeedInstall connects you with San Jose radon mitigation pros who hold NRPP or NRSB certifications, follow Santa Clara permit requirements, and design quiet exterior fan installations.
San Jose radon mitigation systems run $1,400-$3,500 for slab-on-grade, $2,200-$5,500 for crawlspace. CA requires a contractor's license. NRPP or NRSB certification recommended for radon-specific work. Post-mitigation testing required to verify <4 pCi/L. Most installs run 1 day. Permits typically required ($75-$150) in Santa Clara County.
Frequently Asked Questions
- Should I test first?
- Yes — short-term tests (3-7 day, $20-$40 kits) screen quickly. Long-term tests (90+ day) confirm. Levels above 4 pCi/L warrant mitigation; 2-4 pCi/L is borderline and worth follow-up testing.
- How does mitigation work?
- Sub-slab depressurization: a vent pipe punched through the slab with an inline fan creates negative pressure that pulls soil gas before it enters the home. Discharges above the eaves.
- How loud is the fan?
- Modern radon fans are quiet (40-50 dB) but can be a low hum in attic-mounted setups. Exterior-mounted fans are quieter inside the home; pick a unit rated for your slab area.
About NeedInstall
NeedInstall helps connect customers with local installation professionals across San Jose and surrounding communities. Featured contractors have claimed their profile and verified their business information. Listings marked as "Verified Pro" have been confirmed by the business owner.