Preface
About
This is a directory of people and firms with a current radon testing or mitigation credential on an official US state file or a current NRPP or NRSB certification. It is not a radon contractor. We do not test homes, install systems, or match you to a salesperson.
Every listing shows the credential number, the issuing body, the date we last checked the file, and a link to that official source. We do not publish star ratings, “top 10” lists, or EPA-certified badges. EPA does not certify radon contractors.
City and listing maps mark the city or county named on the source file. Official rosters usually do not include a street, so pins are labeled approximate. We do not invent an office address.