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Department of Environmental Health
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Indoor air quality - Radon

​CPD responds to questions, conducts surveys, and provides education services to assist the public in understanding and resolving problems related to radon and other indoor air pollutants.

The California Department of Public Health is sending out free Radon test kits for residents of Santa Clara County. If you received a letter for the free Radon test kit from CDPH, please contact them at [email protected] or (800) 745-7236. You can also click the CDPH-Indoor Radon Program link below for more information.​​