San Jose, CA Radon Levels
Check local San Jose radon levels and find certified testing and mitigation professionals to keep your home safe
San Jose, CA Radon Facts
Downtown Santa Clara County's urban core sits in the heart of Silicon Valley on alluvial deposits from surrounding hills, where mixed geological conditions contribute to variable radon potential across different neighborhoods. The area features diverse housing stock from historic construction to modern high-rise development, with foundation types ranging from older basement construction to contemporary slab systems. Current radon testing indicates an average level of 4.2 pCi/L, which exceeds the EPA's 4.0 pCi/L action level, making testing and potential mitigation important considerations for residents.
Based on 5 user-submitted radon tests for homes in San Jose, CA. The EPA recommends taking action at or above 4.0 pCi/L.
San Jose, CA Radon Mitigation
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San Jose, CA Radon Levels
User-submitted radon test readings from homes in the San Jose area.
| Radon Level | City | Home Age | Foundation |
|---|---|---|---|
| 4 pCi/L | San Jose, CA | — | No Basement/All Slab |
| 4 pCi/L | San Jose, CA | 51-99 Years | No Basement/All Crawl Space |
| 5 pCi/L | San Jose, CA | 51-99 Years | No Basement/All Slab |
| 4 pCi/L | San Jose, CA | 21-50 Years | No Basement/All Crawl Space |
Have a radon test result for San Jose? Submit your reading to help other homeowners.
Radon FAQ for San Jose, CA
What is the average radon level in San Jose, CA?
What EPA Radon Zone is San Jose in?
How much does radon mitigation cost in San Jose?
Should I test for radon if I'm buying a home in San Jose?
Most Active Radon Markets in California
Cities in California with the most user-submitted radon test data, ranked by number of submissions.
| City | Avg User Radon Level | Submissions |
|---|---|---|
| Los Angeles | 7.83 pCi/L | 6 |
| Mammoth Lakes | 10.80 pCi/L | 5 |
| San Jose | 4.20 pCi/L | 5 |
| Rancho Palos Verdes | 8.00 pCi/L | 4 |
| Bishop | 6.25 pCi/L | 4 |
| Oakland | 5.00 pCi/L | 4 |
| Woodland Hills | 7.67 pCi/L | 3 |
| South Lake Tahoe | 6.33 pCi/L | 3 |
| Palos Verdes Peninsula | 6.00 pCi/L | 3 |
| Sacramento | 4.33 pCi/L | 3 |