Radon
Before exploring the resources below, please note that answers to some common questions may also be found on our FAQs page. Information regarding standard service pricing, laboratory turnaround times, rush fees, and other costs is available on the Payments and Costs page.
2. Where Does Radon Come From?
3. Can California Homes Have Radon?
4. How Does Radon Enter a Home?
5. How Is a Home Tested for Radon?
6. What Is a Continuous Radon Monitor (CRM)?
7. Short-Term vs. Long-Term Radon Testing
9. What Is the EPA Radon Action Level?
10. What Does a Radon Result Between 2 and 4 pCi/L Mean?
11. How Long Does a Radon Test Take?
12. What Are Closed-Building Conditions for Radon Testing?
13. Where Should Radon Testing Devices Be Placed?
14. Can Weather Affect Radon Test Results?
15. Does a Basement Increase the Risk of Radon?
16. Should You Test for Radon When Buying a House?
The following federal and state government resources provide additional information regarding radon, radon testing, health risks, occupational exposure, mitigation, professional certification, and California-specific radon requirements. McConnell Environmental Consulting (MEC) provides these links as helpful references for property owners, contractors, property managers, real estate professionals, and other environmental professionals.
Federal Radon Resources
- U.S. EPA — Radon
EPA's primary radon resource. It provides information about radon health risks, testing, mitigation, professional standards, state programs, and other resources. EPA emphasizes that testing is the only way to determine the radon concentration in a building. - U.S. EPA — Radon Action Level
EPA recommends mitigation when a home's radon concentration is 4 pCi/L or greater and recommends considering mitigation between 2 and 4 pCi/L. - U.S. EPA — Radon Resources
A collection of EPA publications, educational materials, webinars, outreach materials, and other radon information.
OSHA Radon Resources
- OSHA — Ionizing Radiation
OSHA's primary occupational radiation resource. OSHA specifically recognizes workplaces with elevated naturally occurring radioactive material, including
California Radon Resources
- California Department of Public Health — Radon Program
This should be your main California radon link. It is the official CDPH Indoor Radon Program and provides access to California-specific information about testing, certification, regulations, professionals, and radon risks. - CDPH — Radon in California
A good public-facing resource specifically discussing radon in California and the importance of testing individual buildings. - CDPH — Certified Radon Service Providers
California law requires radon service providers operating in the state to be certified, and this CDPH resource provides information concerning certified providers. - CDPH — Radon Regulations and Standards
CDPH provides California's applicable radon laws, regulations, standards, and statutory authority governing the state's Indoor Radon Program and radon service providers. - CDPH — Radon and Real Estate
Very relevant to MEC's homeowner and real-estate clients. CDPH explains how radon relates to California real estate transactions and disclosure requirements.