About Us

The Ellrott family has been involved in the construction trade since 1967.  In the early years we specialized in heating, ventilating and air conditioning.  During the 1980’s we expanded into general contracting and land development.  In 1990, Fred Ellrott expanded into the radon mitigation industry.  He successfully completed the Radon mitigation course at the Midwest Universities Radon Consortium (MURC) in June of 1990.  Since then, we have installed hundreds of the finest radon reduction systems in California, and have often resolved even the most difficult of homes and commercial buildings that other mitigators avoid.  With our experience and background in the heating, ventilating and air conditioning industry we are uniquely qualified to take a whole house approach to radon reduction systems.

No matter how large or how small, how simple or complex your radon mitigation needs are, we are able to design and install the system(s) that will best suit your needs.  We are licensed by the California State License Board #617021 and are certified and listed  by California for radon mitigations as well as the National Environmental Health Association #101023RMT and National Radon Safety Board #NRSB G31163, and are active members of the American Association of Radon Scientists and Technologists (AARST).

Certifications, Qualifications and Licensure:

National Environmental Health Assoc.
  • National Radon Proficiency Program
  • Residential Mitigation Provider
  • NEHA Certification Number 101023RMT
  • Expiration Date: 4/30/2021
The National Radon Safety Board
  • Radon Mitigator
  • NRSB Certification Number NRSB G31163
  • Expiration Date: 6/30/2020
California Contractors License
  • Classes: B, General Contractor, C-20, HVAC
  • License Number: 617021
  • Expiration Date: 4/30/2021
American Association of Radon Scientists & Technologists
  • AARST Membership Number 1279
  • Expiration Date: 8/31/2019

Additional Training

Radon Measurement Proficiency Course,
   Midwest Universities Radon Consortium, March 1993

Unique Mitigation Challenges,
   National Consortium of Radon Training Centers, September 1996

AARST - Radon Mitigation in Schools,
   Eastern Regional Radon Training Center, October 2003

Public Speaking For The Radon Professional Course,
   Western Regional Radon Training Center, September 2005


Hi Fred,

I wanted to take the time to personally thank you for your efforts with regards to the Radon mitigation you performed on my house.  On the surface my home was deemed to be a very straightforward mitigation project and your bid came in competitive to compared to other bids I received.  I selected your bid based on you diverse background as it relates to radon mitigation.  The diversity of projects you worked on gave me the confidence you always use “Best business practices”  and a good understanding the latest technology on how to treat radon gas mitigation. (Others on the California Radon web site did not have the same experience.).
The good news was my house was supposed to be simple based on the walk through, visual evaluation current Radon reading.  As you are well aware – my property with a complex subsurface basement became quite a difficult one.  You ability to use your expertise regarding home construction, unique materials and techniques to deliver solutions saved me significant dollars regarding post radon mitigation surface repair work.  I am convinced you saved me thousands of dollars with your design techniques along with a lasting solution for my problem. 
I was the general contractor on my home ~ 10 yrs ago and managed numerous subcontractors.  I would say you are "Best of Class" and would always recommend your company.  Aside from your Radon expertise, you did all the little things that show your professionalism, quote was timely and competitive, responsive to email questions and phone calls, always on time and cleanliness of all work (Drilling, Floating material to seal flooring etc etc), Significant investment with the proper equipment: Radon test equipment, Video Camera, Drilling equipment and radon gas supplies.
Lastly – with all the complex issues with my home – you never mentioned any consideration for additional payment for work rendered - even when I suggested it would be reasonable request. 
I would recommend you for any radon mitigation – your company is truly "Best of class".

John Munro
San Jose California

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