4.8 
55 *The Angi rating for Radon Detection And Reduction companies in Castle Rock, 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 Castle Rock, 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 March 19, 2025
Serving Castle Rock, 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 Castle Rock, CO and surrounding areas
Approved
Super Service Award Winner
In business since 2023
Free estimates
Warranties offered
"Gage from Custom Radon Mitigation Systems did an amazing job installing my radon mitigation system. Upon arrival, he determined the best location in my mechanical room where to install the system, provided a timeframe for completion, kept me apprised of where he was in the process and informed me on how the system ran. Before the installation, my radon levels in my finished basement were routinely well above 4.0 pCi/L with a high of 14+ pCi/L. Since installation and checking for a few days, my radon level is often below 1.0 pCi/L and no more than 1.5 pCi/L. I'm very pleased with the system and Gage's professionalism. I sleep better at night knowing that my RadonEye device won't be setting off an alarm 2-3 times a day now. If you're considering a radon gas abatement system, I highly recommend Gage and Custom Radon Mitigation Solutions."
+4
Serving Castle Rock, 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 Castle Rock, CO and surrounding areas
Approved
In business since 2014
Free estimates
Warranties offered
"Steve did a great job and provided several options for our Radon mitigation. He did a great job and the Radon levels quickly dropped to well below minimum standard."
+5
Serving Castle Rock, 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 Castle Rock, 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 Castle Rock, 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 Castle Rock, CO and surrounding areas
Approved
In business since 2014
Free estimates
Warranties offered
"John and his company were very professional. We had a couple snafus with the sale/buying of our houses. John was very accommodating. We got our radon done and very pleased :)"
+3
Serving Castle Rock, CO and surrounding areas
Approved
In business since 2015
Free estimates
Emergency services offered
"Within 24 hours of install my home went from the high 6's in radon levels down to the high 2's and mid 3's. Professional and very efficient personnel at reasonable prices."
+13
Serving Castle Rock, CO and surrounding areas
Approved
In business since 2019
Free estimates
Warranties offered
"Honest, Hardworking people. Quick quote and efficient work. Strongly recommend this company for any Radon needs at home."
+28
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.
