How Much Does Radon Mitigation Cost in California?
California pricing is above the national average. Updated for 2026.
Radon Mitigation Pricing in California
In California, the average cost for radon mitigation is $1,620 per system, which is 35% higher than the national average of $1,200. Most California residents pay between $1,080 and $3,375.
California has a higher cost of living than most states, which translates to higher labor rates and material costs. Urban areas within California may be even higher.
Radon mitigation systems reduce indoor radon gas levels through sub-slab depressurization, sealing cracks, or installing ventilation systems. Radon is the second leading cause of lung cancer.
California vs National Average
What Affects Radon Mitigation Cost in California?
Foundation
Basement: $800-$1,500. Slab-on-grade: $1,000-$1,800. Crawl space: $1,200-$2,500. Multiple foundation types: $1,500-$2,500
System
Sub-slab depressurization: $800-$1,500. Sub-membrane: $1,200-$2,000. Heat recovery ventilator: $1,500-$2,500
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💡 Tips to Save on Radon Mitigation in California
- 1.Start with a radon test kit ($15-$40) before hiring a pro
- 2.Sub-slab depressurization is the most cost-effective method
- 3.Some states offer tax credits or subsidies for radon mitigation
- 4.DIY-friendly test kits are available at hardware stores
📈 Radon Mitigation in California Cost Trends (2020–2024)
Prices have increased +17.7% over the last 5 years
| Year | National Avg | YoY Change |
|---|---|---|
| 2020 | $1,376 | — |
| 2021 | $1,434 | +4.2% |
| 2022 | $1,527 | +6.5% |
| 2023 | $1,570 | +2.8% |
| 2024 | $1,620 | +3.2% |
Based on national averages adjusted for annual inflation. Actual costs vary by location and project scope.
💬 What Did You Pay?
Real costs reported by homeowners for Radon Mitigation in California
Recent Reports
Frequently Asked Questions
What radon level requires mitigation?
The EPA recommends mitigation if radon levels are at or above 4 pCi/L (picocuries per liter). Many experts suggest considering mitigation at 2 pCi/L.
Radon Mitigation Cost in Other States
Related Cost Guides for California
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