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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.  

Radon News


COVID-19 and delays in radon test results

If you have received or used a test kit provided to you through CDPH, then  please read this notice from our partner laboratory, Alpha Energy, regarding radon test kit analysis during this time of responsible social distancing and self-isolation: 

Alpha Energy Laboratory Temporarily Suspends Non-Essential Operations


Alameda County Winter Radon Screening Survey - CLOSED

Our annual Winter Radon Screening Survey has ended. Thank you to the many participants we had this year! Our next screening survey launch is tentativley scheduled for Winter 2020-2021.  


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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