A. Douglas Thibodeau, LLC
Protecting Families From Radon - In the Air - In the Water​


"Service is Our #1 Priority"


About Me

This is a family owned company that treats its customers with respect and provides the service you would expect from a small company. If issues arise or you have questions, we are only a phone call, text or email away. I started the business with my father,
A. Douglas Thibodeau, in April, 2005. He always stressed that a company should treat its customers like family.

A. Douglas Thibodeau, LLC is a full-service radon mitigation company offering:

– Air and water radon testing
– Installation of air mitigation systems
– Installation of appropriate radon in water mitigation systems
– Electrical work by a licensed electrician
– Post installation clean-up of premises
– Post mitigation testing

My company will work with you or your real estate agent to make the process as simple and worry-free as possible while safely mitigating the radon from the air or water in your house.

Michael D. Thibodeau


A. Douglas Thibodeau LLC,

Member NRPP (National Radon Proficiency Program)
Residential Mitigation Provider ID No. 108126 RMT
Residential Measurement Provider ID No. 108125 RT
and Connecticut Home Improvement
Contractor License No. 0644308



Consultations, Radon in Air and Water Mitigation, Post Installation Radon Testing, Annual Carbon System Exchanges, Service/ Repairs Air and Water.

Radon In Air Mitigation

At Last, an answer to radon plagued air.
Ask for Radon Away Fans.

Radon In Water Mitigation

At Last, an answer to radon plagued water.
Ask for the Bubble-Up System.

Radon Testing Service

We can accurately test your home's air and/or water.


Radon Commercial Installs

Using state of the art equipment to bring your levels of radon to an appropriate level.


Radon Diagnostics

We can diagnose your home to provide the best possible radon abatement solution.


Radon Consulting

We can help you determine your Radon Abatement Requirements and Solutions.


Customer Reviews

Brian Daley

Our radon levels weren't terribly high (~3 pCi/L), but we wanted to make the basement as safe as possible for everyone in the house. Because the levels were already fairly low, we didn't have unrealistic expectations for the results. But we were pretty shocked when the post-install test came back with a level of 0.5 pCi/L.

The team was very helpful and professional throughout the process. The installation was great and we're really happy with the results.

Lane Milde

I could not be happier with my experience. When I purchased my home, I had a radon test done for the air and water (the house already had an air system installed.) The water test came back high and I reached out to a few companies for information and advice. Mike Thibodeau was extremely helpful throughout the process (I called him 3 or 4 times with follow up questions.) He understands the value of great customer service and creating a lifetime customer.

Mark Cyg

Professionalism, Punctuality, Quality, Responsiveness, Value. When I bought my house I tested for Radon in both air and water. The air was good, but my water tested high, I called several other companies and they all tried to price gouge me for some bubble up thing that cost 5 grand. Mike explained to me that my levels were low enough that I could use the system he installed at 1/2 the price. I would recommend him 10 times out of 10.

Alexandra Fritz

Extremely pleased with the professionalism and thoroughness from Mike at A. Douglas Thibodeau LLC. He was a pleasure to work with from start to finish. Mike informed us on everything he was doing to make sure my new home was safe for me and my family. I would highly recommend Mike to anyone in need of Radon mitigation assistance.

Bill Hann

I first viewed Mike’s work after his home-sale installation at my daughter’s new home. He created an elegant solution to a difficult install, and the quality of the work was recommendation enough for me to call concerning my own remediation needs.

My needs involved connecting a never-used 26-year-old sub-slab radon piping system to an existing 2-story riser and then going through the roof. While it sounds simple, be aware that all of the previous Radon System work was done during the early part of the building process, and no one had any interest along the way in maintaining clear access.

Mike devised a plan, revised it as needed during the install, and reduced my air radon reading from 8.8 to an almost non-existent 0.3.

Professional work, reasonable cost, and great results-Highly Recommended!

Susan and Doug Stewart

We recently had Mike Thibodeau do radon testing and subsequently install a radon fan system in our basement. My husband and I were very happy with the prompt responses to our calls and questions. Mike was professional, courteous , informative in regard to our installation. We would highly recommend using him.


If you're in need of a radon mitigation system, I highly recommend A. Douglas Thibodeau. Mike explained all the steps involved and was able to answer my questions clearly and honestly. The work was done professionally and promptly by Mike and his team. We are very happy customers!


Very happy working with Mike. Always very responsive to calls. Took the time to understand the problems I was trying to address (more than just radon), and walk me through the options.

Installation was very clean, and Mike was willing to chat and address questions post-install. A refreshing change to my normal experience with contractors! I've already recommended him to others.

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Wash your Hands!