The 10 best-rated radon testing services in Westminster, CO average 4.9★ on Google across 3,049 reviews. Colorado Radon Mitigation has the top rating (5.0★), and Radon Safety LLC has the most reviews (704). Updated October 26, 2026.
10 companies that meet our bar: rated 4.5★ or higher on Google, with a meaningful review history (3,049 reviews combined) and currently operating. Request a call back and the company will phone you directly.
“Kelon did some good work and seemed to go pretty above and beyond. Plus a lot of home maintenance companies appear to have been taken over by hedge funds and turned their techs into sales people. I didn't catch that…” — Google review
“Darren and his team are excellent!! Darren provided prompt customer service and explained everything needed to mitigate our home. Jaden did a stellar job installing our system. Even when our home proved to be a very…” — Google review
“They did a great job - quick, respectful, professional, and reasonable! Highly recommend. We had a new radon mitigation system installed on an existing home.” — Google review
“Had a radon mitigation system installed and they did an amazing job! They came out quickly, did quality work, very clean, courteous, and explained everything well! Very professional and fairly priced. Would highly…” — Google review
“We recently had a radon mitigation system installed. The team was professional, courteous and performed quality work. Sean was great throughout the entire process. We’re very happy with Sean and Absolute Radon Safety…” — Google review
“Byron and Bryan were professional, knowledgeable and efficient. Great work, and pleasant to deal with. I highly recommend them!” — Google review
“I'm happy with the work they did and would recommend. Very friendly folks and didn't mind all my questions when they were installing.” — Google review
“Everything from the first call was not only professional but thoughtful from these guys. Patrick was readily available and answered all my questions, providing me with more options and useful info that went beyond my…” — Google review
“The install went very well everyone was very pleasant to work with very pleased with the radon mitigation. Radon levels are very low now is way down now. I would definitely recommend this company to do the install.” — Google review
“Aarmond was responsive, on time and quick to help diagnose our problem with our radon system. I highly recommend Aarmond and his company. Thanks, Aarmond.” — Google review
We scan Google Maps for radon testing service listings in and around Westminster, keep only open businesses whose main category matches the service, and require a Google rating of at least 4.5 from at least 20 reviews. Companies are ordered by a confidence-weighted score that balances rating and review volume. We do not accept payment for placement.
Colorado Radon Mitigation has the highest Google rating on our Westminster list: 5.0 out of 5 from 223 reviews (as of October 26, 2026).
Radon Safety LLC has the most Google reviews among the companies listed here: 704, with a 4.9★ average.
Only open Westminster-area businesses whose Google category matches the service, rated at least 4.5★ from at least 20 Google reviews. They are ordered by a confidence-weighted score of rating and review volume. Placement is never paid.
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