Colorado's state health department says radon is found at elevated levels in one out of every two Colorado homes, and it ranks radon as the leading cause of lung cancer among non-smokers in the U.S. Testing is the only way to know a home's level, and a mitigation system is the fix when a test comes back high.
This page lists every Colorado city in the directory. Companies that install mitigation systems are shown first; testing-only companies, such as home inspectors, are labeled.
All cities
Smaller towns
These towns have fewer than 3 listed radon contractors and are too far from a larger city to share its page.
Frequently asked questions
How many radon contractors are listed in Colorado?
160 at the last update on 2026-11-04, across 18 cities. Cities with fewer than 3 listed businesses are folded into the nearest city page.
Which Colorado city has the most radon contractors?
Colorado Springs, with 20 listed. Denver is next with 18.
Can I be listed here?
If you run a radon contractor business in Colorado and are not listed, use the claim form and we will check the details and add you. Basic listings are free.