Berkshire Radon Technologies LLC

Founded by Robert E. Drennan as an adjunct to his home inspection business, Berkshire Radon Technologies LLC has been installing mitigation systems throughout the Berkshires and Columbia County, NY since 2000. Robert, who passed away in 2009, had a rich history in the field of nuclear physics, including designing instrumentation to collect data after a nuclear event generated by a cyclotron or linear accelerator, as well as aircraft instrumentation, and motorcycle and engine manufacturing. After 25 years as a general contractor and designer/builder, he became an ASHI Home Inspector in 1997, and then completed coursework and certification requirements in both Radon Measurement and Analysis, and Radon Mitigation. Robert was known as a thorough, knowledgeable and entertaining home inspector, and his radon mitigation work was impeccable. He is greatly missed.

Berkshire Radon Technologies LLC is now managed by his wife, Rose Tannenbaum, who worked hand in glove with her husband of 25 years. She became knowledgeable about radon while managing the office work for the business. Rose graduated from Cornell University with a degree in design, and has been a graphic designer since 1991. She lives in Great Barrington, MA.

The actual radon work is now in the capable hands of Justin Zieminski, who worked with Bob for several years. Justin, a highly-skilled technician, is fully certified in both mitigation and measurement and analysis. He is the main go-to guy for BRT’s testing and mitigation jobs, continuing the tradition of fine work and excellent customer service for which we are known.

We are your local company for radon —
Serving Massachusetts and New York.


Robert E. Drennan


Rose Tannenbaum Drennan


Justin Zieminski

“Where radon problems have been fixed, home sales have not been blocked or frustrated. The added protection is sometims a good selling point.”
— EPA Citizen’s Guide