Find a Certified Professional

Find a Professional lists individuals who currently hold an NRPP certification in radon measurement or radon mitigation. Search by location and by the kind of work you need, then open a name to see that person’s credentials, their training, their place of business and the state radon office that covers them.

Search the directory

Which one do I need?

• You have not tested yet. You need a measurement professional. Radon cannot be seen or smelled and a test is the only way to know what your levels are.
• You tested at 4 pCi/L or above. You need a mitigation professional. Four picocuries per liter is the EPA action level.
• You are buying or selling a house. Start with a measurement professional. Some states have specific rules about radon testing during a real estate transaction, so ask the professional what applies locally.
• You have an existing system that may not be working. A mitigation professional can diagnose it. Fans typically last five years or so and can be repaired or replaced.

What to check before you hire

• That the certification shown in the directory is current, and that it is for the work you are asking for.
• Whether your state requires a license as well as certification, and whether the professional holds it.
• Get more than one estimate for mitigation work. Cost varies with the size and the design of the building and with the method needed.
• That the work will be carried out to the applicable AARST and ANSI standard, and that you will get a post mitigation test to prove the system worked.

If something goes wrong

If a system was installed by an NRPP certified professional and it does not reduce your levels, raise it with the installer first. If that does not resolve it, a complaint can be made to NRPP through the complaints process [confirm complaints page link]. Complaints about work carried out by someone who is not certified should go to your state radon office.

Testing your own home

Do it yourself test kits are available from some county and state health departments, from the National Radon Program Services at Kansas State University on 1-800-SOS-RADON (1-800-767-7236), and from some home improvement stores. For general questions about radon in your home, the EPA supported help line is 1-800-55RADON (1-800-557-2366).