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Best radon detection and reduction specialists near Danbury, CT

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Top-Rated Radon detection and reduction specialists in Danbury - Updated Nov 2026

Avatar for Lance Dorfi, LLC
Lance Dorfi, LLC
4.7(
64
)
Radon Gas - AbatementRadon Gas - Testing

Serving Danbury, CT and surrounding areas

Approved

In business since 2010

Free estimates

Emergency services offered

"Lance Dorfi was proactive, efficient, and professional. They came to every appointment on time and tailored a radon mitigation solution that reduced the levels. I would highly recommend them for radon mitigation!"
Job Site
Response time2 days
20 neighbors recently requested a quote
Recommended by96%of homeowners
A & R Environmental, LLC
4.7(
72
)
Radon Gas - Abatement

Serving Danbury, CT and surrounding areas

Approved

In business since 1995

Free estimates

Credit card accepted

"The engineers who installed the radon mitigation system were knowledgeable and pleasant . They answered all of our questions patiently. They follow up and communicated with us within the year to check on the system. I recommend A & R enthusiastically."
 tucked against a gutter
 Pipe thru a wood floor
hidden behind an outcrop
 AIRaider 433
Pipe thru closet shelf

+10

Response time11 hrs
29 neighbors recently requested a quote
Recommended by96%of homeowners
Avatar for MDL Radon Mitigation and Measurement LLC
MDL Radon Mitigation and Measurement LLC
5.0(
35
)
Radon Gas - Abatement

Serving Danbury, CT and surrounding areas

Approved

In business since 2018

Free estimates

Credit card accepted

"Doug Urisko of MDL Radon Mitigation and Measurement LLC was extremely helpful and knowledgeable with the issues I was experiencing with my radon water mitigation system. He offered information and his experience to resolve the issues with my water system. He took his time to help me troubleshoot these issues and help me understand what I can do in the future. I am beyond appreciative of Doug?s help and would highly suggest MDL Radon for any of your radon mitigation needs!"
Typical ASD Radon System
Typical ASD Photos
Typical ASD Photos
Typical ASD Photos
Typical ASD Photos

+2

Response time6 hrs
Response rate90%
Recommended by96%of homeowners
Avatar for Apex Radon Solutions LLC
Apex Radon Solutions LLC
5.0(
11
)
Radon Gas - AbatementRadon Gas - Testing

Serving Danbury, CT and surrounding areas

Approved

In business since 2015

Free estimates

Warranties offered

"I highly recommend Apex Radon Solutions. From getting the estimate to getting the work done, everything was just outstanding. Marco and his crew of 3 men showed up early and were all knowledgeable and extremely skilled. I had to install a radon fan and put in piping and electrical. They measured the piping with care and accuracy and did an excellent job with the installation. Iâ m truly impressed with the professionalism and quality of the work. They were also very reasonable with their prices. Thank you Apex for such great work."
Roof penetration for esthetics
Interior Esthetic Package
Exterior Radon Fan
Exterior Radon Fan
Exterior Radon Fan

+3

Response time2 days
26 neighbors recently requested a quote
Recommended by100%of homeowners
Oakhill Home Inspections
5.0(
1
)
Radon Gas - Testing

Serving Danbury, CT and surrounding areas

Approved

In business since 2025

Free estimates

Emergency services offered

I pride my company on reliability, great communication, integrity, and quality work. I am an expert in home inspections, mold testing and radon testing and remediation. I will do my absolute best to keep you as educated and informed on your particular inspection project. I look forward to earning your business! Book with me online or feel free to give me a call today! My focus is protecting your home investment.\n\nThank You,\nCharles Rauch\nOakhill Home Inspections

Response time5 hrs
Response rate86%
2 neighbors recently requested a quote
Avatar for The Lab
The Lab
New to Angi
Radon Gas - Testing

Serving Danbury, CT and surrounding areas

Approved

In business since 2020

Emergency services offered

Small jobs welcome

The Lab is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business.

Response time1 day
1 neighbors recently requested a quote
Avatar for Secure Home Inspections of NY, LLC
Secure Home Inspections of NY, LLC
4.9(
9
)
Radon Gas - Testing

Serving Danbury, CT and surrounding areas

In business since 2018

Free estimates

Warranties offered

"John M. was courteous, timely, and professional in his inspection. He was upfront about the issues -- whether they are serious or minor, rare or common, and whether more specialized input is required. His written report was very well done and will serve as a great home guide for us in the future after we move in. Thank you!"
Connecticut Condo
Electric Panel
Electric Panel
Missing Railings
Footings in a stone foundaiton

+7

Response time1 hour
Recommended by100%of homeowners
Avatar for Family Home Inspections, Inc.
Family Home Inspections, Inc.
4.3(
45
)
Radon Gas - Testing

Serving Danbury, CT and surrounding areas

In business since 2018

Free estimates

Emergency services offered

"Mike was very friendly, and knowledgeable. He inspected the entire house and sure enough he did find mold in our basement. His own reports helped us understand the Lab reports and he advised us on how to remediate the problems in our home. I highly recommend him for any inspections you need"
Mold
Start of Mold Problems
Response time3 hrs
Recommended by88%of homeowners
Showing 1-10 of 24
Radon Detection and Reduction FAQs, answered by experts

You can vent radon out of your house sometimes by simply opening a window, but it won’t remove the source, and will likely rise above recommended levels quickly. A professional will be needed to assess your home, and determine the best strategy for radon removal. Active radon sump pumps and soil depressurization systems are often used to forcefully vent the radon from your home.

Ideally, no one will live in a house with elevated radon levels, as prolonged exposure increases the risk of serious health issues like lung cancer. However, homes with radon can be made safe through mitigation systems, such as active soil depressurization. Testing for radon regularly and addressing high levels helps ensure a safe living environment.

You'll need to test your home for radon after installing the mitigation system, then again every two years. If radon remains elevated, contact a licensed radon professional, either the contractor who installed the system or a different one, and have them evaluate the system. They may need to make some changes to improve its effectiveness and performance.

Radon is a cancer-causing radioactive gas that poses serious health risks, infiltrating homes through foundation cracks and unnoticed spaces.

While DIY testing is possible, abatement generally requires professional installation to ensure efficacy and meet safety standards.

The Danbury, CT homeowners’ guide to radon detection and reduction services

From average costs to expert advice, get all the answers you need to get your job done.