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Indoor Radon Program 

The Indoor Radon Program, within the Environmental Management Branch, seeks to reduce the health risk from radon exposure by increasing awareness, identifying areas of high radon potential, and encouraging all Californians to test their homes for radon, fix their homes if they have a radon problem, and build new homes radon-resistant. Test. Fix. Save a Life.  


Free Radon Test Kits for California Residents

January is National Radon Action Month, and is the perfect time to test your home for radon gas. All California households can request a free test kit from our partner laboratory, Alpha Energy Labs, while supplies last. Please allow 4-6 weeks for delivery. Your test results remain confidential, and may help in determining whether your home is at risk for exposure to elevated levels of radon gas. 

Free California Test Kit Online Order Form


Interactive California Radon Potential Map

The California Geological Survey has released an interactive web map providing radon potential information for areas of California with completed radon potential maps. Downloadable GIS data for each study area can now be downloaded through the interactive map.


​​Contact the radon program at radonprogram@cdph.ca.gov (email) or 1-800-745-7236 (telephone).
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