. . .

Certified Radon Professional List

National Radon Proficiency Program Certified Professionals

Mitigators:
http://www.nrpp.info/radon_measurement_service.shtml
Testors:
http://www.nrpp.info/radon_mitigation_service.shtml

National Radon Safety Board Certified Professionals

For All Professionals:
http://www.nrsb.org/find_a_professional.asp?action=go

State Radon Programs

Some states have radon certification or registration programs. Please contact the state’s radon program to get a complete listing of who is able to legally provide services in your area.

http://www.epa.gov/radon/whereyoulive.html