What do we recommend?  It is important to read to the end of this page.


While it is not required by law in NC that radon testers or mitigators have any certifications, the NC Radon Program highly recommends hiring a trained professional. 


The NC Radon Program cannot endorse any particular certification company or individual, so we recommend researching the individuals qualifications and asking for references. 


Radon Testing: Here are three organizations that list trained testers


Inspector Nation

National Radon Safety Board

National Radon Proficiency Program



Radon Mitigation: Here are two organizations that list trained mitigators


National Radon Safety Board

National Radon Proficiency Program



We also recommend asking, of whomever you hire, the following:


  1. Yes No Will the contractor provide references of past radon reduction work? Did you contact references?


  2. Yes No Can the contractor explain what the work will involve and how the radon reduction system will work?


  3. Yes No Did the contractor physically inspect your home’s structure before giving you an estimate?


  4. Yes No Did the contractor review your radon measurement results and determine if appropriate testing procedures were followed?


Do the contractors’ Proposals and Estimates include?


  1. Yes No Proof of current Certification for Radon Mitigation with either National Radon Proficiency Program (NRPP) or NRSB (National Radon Safety Board)?


  2. Yes No Proof of liability insurance and having all necessary licenses to satisfy local requirements?


  3. Yes No Does the contractor charge a fee for diagnostic tests? Many contractors give free estimates, but they may charge for diagnostic tests. These tests may help determine what type of radon reduction system should be used and in some cases diagnostics are helpful for initial design of a system.


  4. Yes No A guarantee to reduce radon levels to less than 4.0 pCi/L and if so, for how long?


Important information that should appear in the Contract includes:


  1. Yes No The total cost of the job, including all taxes and permit fees; how much, if any, is required for a deposit; and when payment is due in full.


  2. Yes No The time needed to complete the work.


  3. Yes No Agreement by the contractor to obtain necessary permits and follow required building and electrical codes. Note: Modification or addition of existing electrical wiring usually requires a licensed electrician.


  4. Yes No Statement that the contractor carries liability insurance and insured to protect you in case of injury to persons, or damage to property, while the work is being done.


  5. Yes No Guarantee the contractor will be responsible for damage during the job and cleanup after the job.


  6. Yes No Details of any guarantee to reduce radon below a negotiated level.


  7. Yes No Details of warranties associated with the hardware components of the mitigation system.


  8. Yes No Declaration stating whether any warranties or guarantees are transferable if you sell your home.


  9. Yes No Description of homeowner responsibilities to make work areas accessible prior to start.


Below is a list of basic installation requirements:


  1. Yes No Radon reduction systems must be clearly labeled to avoid accidental changes to the system that could disrupt its function.


  2. Yes No The exhaust pipes of soil suction systems must vent above the surface of the roof and 10 feet or more above the ground, and must be at least 10 feet away from windows, doors or other openings that could allow radon to reenter the home, if the exhaust pipes do not vent at least 2 feet above these openings.


  3. Yes No The exhaust fan is properly located. For instance, it should be installed in unconditioned space and the exhaust side of the piping should not be routed through any conditioned space.


  4. Yes No A warning device must be installed to alert you if an active system stops working properly. The warning device must be placed where it can be seen or heard easily.


  5. Yes No Post-mitigation radon test should be done within 30 days of system installation, but no sooner than 24 hours after activation. Note: Closed-house conditions for at least 12 hours before test begins.