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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.  

​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.

Statewide Indoor Radon Potential Report

The California Geological Survey has released Special Report 247: California Indoor Radon Potential (2022), which addresses the radon potential throughout the state of California. The statewide report, and all regional radon potential reports, are available upon request directly from the California Geological Survey.

New! Information Bulletin, California Statutory Requirements Regarding The Government Sponsored Enterprise Multifamily Radon Policy​

The California Department of Public Health has released an Information ​Bulletin (PDF)​​, which addresses the California statutory requirements regarding the Government Sponsored Enterprise (GSE) Multifamily Radon Policy.

Contact the radon program at (email) or 1-800-745-7236 (telephone).
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