CDPH Radon Program is offering a free radon class at the Ronald Reagan Building in Los Angeles. We are inviting the local governments to participate. If you have any questions, please email radonprogram@cdph.ca.gov.
No-cost in-house radon training in California. This class will be held in the Ronald Reagan auditorium at 300 S. Spring St., Los Angeles, CA 90013.
Thursday October 16, 2025: Radon Measurement in Multi-family, Schools, and Large Buildings | 8–5pm Pacific Time
Friday October 17, 2025: Radon Mitigation in Multi-family, Schools, and Large Buildings | 8–5pm Pacific Time
Register to reserve your spot at Kansas State University Radon Courses.
These courses are sponsored by the California Department of Public Health Radon Program. This class is open at no cost to all radon professionals and other individuals who want to learn more about radon.
For people certified through NRPP and NRSB:
Thursday, October 16, 2025: Large Building Measurement, 8 hours CE credit
Friday, October 17, 2025: Large Building Mitigation, 8 hours CE credit
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.
Information Bulletin for Radon Professionals: 100% Ground Contact Testing Requirements for Multifamily Housing
The California Health and Safety Code (HSC) is the prevailing regulatory statute that applies to the control of radon in California including but not limited to requirements for performing radon measurement, mitigation, and laboratory analysis.
HSC Section 106780 requires that no person may provide radon services for the general public, or represent or advertise that he or she may provide radon services unless that person meets the provisions of HSC, Section 106780, which includes successfully completing the National Radon Proficiency Program (NRPP) or the National Radon Safety Board Certified Radon Professional Program (NRSB). Both programs require their certified individuals to follow the
American National Standards Institute, American Association for Radon Scientists and Technologists (ANSI-AARST) standards,
which includes the requirements for 100% ground contact testing for multifamily housing and testing 10% upper floor units. Visit the
NRPP and
NRSB websites to view information regarding their certification requirements.