Welcome to the State of California 

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 Topics

Radon News

What is Radon?
How Radon Gets into Homes
Testing Your Home For Radon
Become A Certified Radon Service Provider
California Test Results
Radon Geologic Reports and Maps
Radon and Real Estate
Radon and Schools
Radon and Health Care Practitioners
Building Radon-Resistant
Radon and Water
Regulations and Standards
Contact Us


Radon News

    Special Report 238 - Radon Potential in Western Tulare County, California. The California Geological Survey has released the latest radon screening survey and map. The new map shows radon potential for the Western Tulare County region.  Click here to view all maps and reports.

 2016 County Winter Radon Screening Survey - kings County

 Residents of Kings County are eligible to receive a free test kit to test their home this winter for radon. Test kits are sent from our partner laboratory, Alpha Energy Laboratories. 

Click Here to Order Online:  County Winter Radon Screening Program

Or call Alpha Energy Laboratories toll-free at (800) 324-5928.


Juegos de la prueba gratuitas estan disponsibles para los residentes de Kings Condado.

 Por favor haga clic en Programa de Invierno de Detección de Radón Condado para recibir el kit a corto plazo de prueba de radón

También puede llamar a (línea gratuita) Alpha Energía Laboratorios al (800) 324-5928

Hay un número limitado de los kits de prueba disponibles para su condado.


 There are a limited number of test kits available.

Test results will be sent to you approximately 3 weeks after you  return the test. You can also Check your test results here once they are available. 


If you encounter problems ordering online or via telephone, please contact the radon program at radonprogram@cdph.ca.gov 



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. Click here to go to the map. Downloadable GIS data for each study area can now be downloaded through the interactive map.



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Last modified on: 12/5/2016 4:18 PM