4.3 
27 *The Angi rating for Radon Detection And Reduction companies in Thornton, 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 Thornton, 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 14, 2025
Serving Thornton, 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 Thornton, CO and surrounding areas
Approved
In business since 2022
Free estimates
Emergency services offered
"The owner was very thorough in explaining our options for location of the radon mitigation system and installed what we agreed on. He is easy to work with and we highly recommend Northern Colorado Radon to others."
+18
Serving Thornton, CO and surrounding areas
Approved
In business since 2014
Free estimates
Warranties offered
"Steve was flexible with my schedule and worked with me to put the radon system in a place that worked with our future plans for the house. He was knowledgeable and helpful! I highly recommend!"
+5
Serving Thornton, CO and surrounding areas
Approved
Super Service Award Winner
In business since 2011
Free estimates
Emergency services offered
"Recently I had radon mitigation system installed in my house. The job was done by Affordable Radon Services LLC. Very friendly workers Ken and Joe worked on my property. They did excellent job. The following test showed significant decrease at the radon level on the property. I am very happy that I hired this company and recommend for your needs."
+25
Serving Thornton, CO and surrounding areas
Approved
In business since 2008
Free estimates
Warranties offered
"They were very quick to respond to my call and very helpful with the radon testing."
Serving Thornton, 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 Thornton, CO and surrounding areas
Approved
In business since 2022
Free estimates
Emergency services offered
"A genuine guy. Very honest and kind. Arrived on time, explained everything that was to be done and why. Work was professional and once complete lowered my radon level from 26 to .6. I do recommend The Radon Guy."
Serving Thornton, CO and surrounding areas
Approved
In business since 2016
Free estimates
Credit card accepted
"Very professional, courteous, and knowledgeable. They didn't oversell me and corrected the issues I was having with persistence and creativity. They got things up and running again with the least amount of work necessary. I highly recommend Rocky Mountain Radon."
+34
Serving Thornton, CO and surrounding areas
Approved
In business since 2020
Free estimates
Warranties offered
"BIG shout out to North Point Radon! We had to re-do some radon mitigation on the house so we could start working on framing in the basement and they came in and did an incredible job. The pressure from the pump (or however you say it) went up from 1.1 to 1.25, so they filled in a bunch of spaces that weren't sealed up properly and cleaned everything up so our contractor can start framing. No big chunks of puffy foam - everything is sealed cleanly and nice and tight now (obvious from the reading on the pressure). Fast, affordable, effective, and we retested the basement and it came at less than 1%. Seriously good people. I would call them if you need any radon stuff (testing, mitigation, etc.) taken care of."
+2
Serving Thornton, 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.
Get clear answers on how much radon remediation costs, including average prices, key cost factors, and tips to save money on your home’s radon mitigation.
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.
