While a student at the University of Scranton, Dr. Gromadzki was inducted into Sigma Pi Sigma, the National Physics Honor Society. In 1973, he was inducted into the American Physical Society, and in 1976, became a member of the American Association of Physicists in Medicine. In 1979, he was inducted into Sigma Xi, the National Scientific Research Society.
In 1978, Dr. Gromadzki was certified by the American Board of Radiology as a medical physicist specializing in therapeutic radiological physics and cancer therapy.
In 1988 he became certified by the EPA's Radon Measurement Proficiency Program as a radon measurement professional, and by the EPA's Radon Contractor Proficiency Program as a radon mitigation and remediation professional. The EPA also certified RTL as an accredited radon testing and analysis laboratory for charcoal canisters and continuous electronic radon monitors.
Dr. Gromadzki and RTL remained certified under the EPA programs until 1996, when the EPA ended its operation of the programs and passed the responsibility to the National Environmental Health Association (NEHA), which renamed them the National Radon Professional Program (NRPP). Dr. Gromadzki and RTL have been accredited by NEHA and the NRPP since 1996.
Dr. Gromadzki has been a member of the American Association of Radon Scientists and Technologists (AARST) since 1990.
In 2000 Dr. Gromadzki earned his North Carolina Real Estate Broker's license, and he maintains his license on an active status. He is a member of the Triangle Multiple Listing Service (MLS) and has access to the MLS database.
Matt Gromadzki has been NRPP-certified in radon testing and mitigation since 2018. He is also a licensed broker with the North Carolina Real Estate Commission.