Radon Test Service LLC listings:
National Radon Safety Board - NRSB
Durridge Company - Manufacturer of Testing Equipment
Resources for further Info:
American Cancer Society
American Lung Association
Contact the NRSB (National Radon Safety Board) or NRPP (National Radon Proficiency Program) for approved mitigators.
To check on system efficiency, homes with mitigation installed should be tested every two years.
Some Local References:
Isothermics - Radon Mitigation
Radon Diagnostic Services