National Radon Proficiency Program
Certification for radon measurement and mitigation professionals
The National Radon Proficiency Program certifies the individuals who measure radon and the individuals who install the systems that reduce it. Certification means a person has completed approved training, passed a written examination, registered and calibrated the devices they use, and agreed to work to a published code of ethics. Credentials are valid for two years and are renewed against continuing education requirements. NRPP is the credentialing arm of the Indoor Environments Association, formerly AARST.
Radon is a naturally occurring radioactive gas. It enters buildings through cracks and gaps in the foundation and, over time, raised indoor levels increase the risk of lung cancer. Testing is the only way to know whether a building has a problem, and a properly designed system can reduce levels in most homes substantially.
Certification programs
Three certification disciplines, each with its own training, examination and renewal requirements.
Radon Measurement
For professionals who test homes and buildings for radon. Covers the RMP-A and RMP-S credentials and the RMFT field technician credential.
Radon Mitigation
For professionals who design and install radon reduction systems. Covers the RMS specialist credential and the RMI installer credential.
Soil Gas Mitigation
For mitigation professionals working on vapor intrusion from soil gases in commercial and larger residential buildings.
Find a certified professional
Find a Professional lists every individual currently certified in radon measurement and mitigation. Search by location and by the type of work you need. Each result opens a profile showing the person’s credentials, their training, their place of business and the state radon office that covers them.
If you are a homeowner, start with a measurement professional. Test first, then mitigate only if the result warrants it. The EPA action level is 4 picocuries per liter.
Already certified?
Renewals are handled in your NRPP certification account. Renewal falls due every two years and requires eight hours of continuing education plus the Mandatory Standards Overview course. See Continuing Education for the categories and limits, or go straight to your renewal application.