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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

2018 Free Radon Test Kits Program Completed

Thank you to the many participants of this year's free radon test kit program. We anticipate repeating the program, subject to availability of funds, during National Radon Action Month 2019.


You can still order low cost test kits from our partner laboratory, Alpha Energy. Visit our Testing Information Page to order test kits and learn how to use the kits and interpret test results. 

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 (email) or 1-800-745-7236 (telephone).
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