4.9 
30 *The Angi rating for Radon Detection And Reduction companies in Denver, CO is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Radon Detection And Reduction needs.
*The HomeAdvisor rating for Radon Detection And Reduction companies in Denver, CO is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Radon Detection And Reduction needs.
Last update on April 27, 2026
Serving Denver, CO and surrounding areas
Approved
In business since 2018
Free estimates
Customers say: True professional
"Highly recommend! Came out gave me all the info I needed about Radon. Replaced my radon fan and retested ! Did a great job!"
Serving Denver, CO and surrounding areas
Approved
Super Service Award Winner
In business since 2023
Free estimates
Warranties offered
"We hired Custom Radon Mitigation to handle our Radon problem. They were awesome, we had zero problems. Great work!"
+4
Serving Denver, CO and surrounding areas
Approved
Super Service Award Winner
In business since 2020
Free estimates
Credit card accepted
"Jason was very helpful explaining the testing process, and possible mitigation if our Radon levels were high. Radon testing was setup and conduced quickly and our levels were in acceptable ranges, so no mitigation was required."
Serving Denver, CO and surrounding areas
Approved
In business since 2014
Free estimates
Warranties offered
"Radon exhaust fan was making noise. I did some research and ascertained bearings were failing in the fan. I arranged a good time to get it replaced, he showed up and had it replaced in about 20 minutes. I did give him the model number of the fan so he knew for sure what I needed. Quick and easy."
+5
Serving Denver, CO and surrounding areas
Approved
Super Service Award Winner
In business since 2011
Free estimates
Emergency services offered
"They showed up on time and finished within 2 hours completing radon mitigation system."
+25
Serving Denver, CO and surrounding areas
Approved
In business since 2008
Free estimates
Warranties offered
"I recently used #1 Radon to fix my existing radon mitigation system. I called and Jesse Fuller came to look at system same-day. He had it repaired the same week. He was professional and made me feel comfortable with work and costs to replace the existing fan. I highly recommend #1 Radon and Jesse Fuller."
Serving Denver, CO and surrounding areas
Approved
In business since 2022
Free estimates
Emergency services offered
"Our radon system was making an unusual humming noise and it was driving me crazy! I found The Radon Guy here on Angi. Shortly after posting my request, Giovanni contacted me and and within a couple of hours I had the answers I needed and a testing system set up to measure levels since they hadn’t been tested in 2 years. He explained the problem and because the fan is under warranty, will be having a new one installed soon. I appreciated Giovanni’s quick response, professional demeanor, fair pricing, and extensive knowledge. Highly recommend!!!"
Serving Denver, CO and surrounding areas
Approved
In business since 2012
Free estimates
Warranties offered
"All Colorado Radon tackled a particularly difficult radon mitigation that other companies refused to mitigate. They were very thorough and knowledgeable. Most of all, they were successful in reducing radon levels to well below government standards. We would use them again."
+1
Serving Denver, CO and surrounding areas
Approved
In business since 2016
Free estimates
Credit card accepted
"I couldn't be more pleased with the radon mitigation service John provided. The estimate was accurate-no surprises. He was prompt, efficient and quick- it took just over 2 hours and that's including answering all my questions (and I had a lot of questions!). John's customer service was excellent and the results have so far exceeded my expectations. I am very glad I chose RMR."
+34
Serving Denver, CO and surrounding areas
Approved
In business since 2014
Free estimates
Warranties offered
"Painless and efficient installation of radon mitigation system. A real pro and highly recommended!"
+3
From average costs to expert advice, get all the answers you need to get your job done.
The cost of a radon mitigation system in Denver, CO, depends mostly on the type of system being installed. Use this guide to learn about your options.
The cost of a radon mitigation system depends mostly on the type of system being installed. Use this guide to learn about your options.
Find out what impacts radon testing costs, including average prices for DIY kits and professional services, so you can protect your home and budget confidently.
Radon is a gas that you can't see or smell and is harmful to your health. If your home has radon, you need to know who installs radon mitigation systems.
What is radon gas? Find out what this radioactive gas is, why it is dangerous, how it gets in your home, and how to mitigate it.
What is radon testing? Radon testing measures the presence and concentration of radon gas within indoor environments. Read on to learn more.
