Colorado radon testing & mitigation directory
Find a Trusted Radon Expert in Colorado
Certified Professionals, Verified Results, Proven Protection
Compare radon testing and mitigation companies in nine Colorado cities, see what a system should cost, and learn how to protect your home from Colorado's leading environmental cause of lung cancer.
Radon levels, in pCi/L
- 0.4
- Average outdoor air
- 1.3
- Average U.S. home
- 2.0
- EPA: consider fixing
- 4.0
- EPA action level: fix the home
About half of Colorado homes test above 4.0 pCi/L, according to CDPHE. The EPA says there is no known safe level of radon.
Browse by city
Radon mitigation companies across Colorado
Each city page lists local radon professionals, typical installation costs for that area, and local testing resources.
Radon mitigation in Denver
Basements, older bungalows and new infill homes across the metro.
Radon mitigation in Colorado Springs
Granite-rich Pikes Peak geology and many basement homes.
Radon mitigation in Aurora
Fast-growing suburbs with many newer, tightly built homes.
Radon mitigation in Fort Collins
Northern Colorado homes with frequent elevated readings.
Radon mitigation in Greeley
Weld County homes, from older farmhouses to new subdivisions.
Radon mitigation in Pueblo
Older housing stock with crawlspaces and partial basements.
Radon mitigation in Grand Junction
Western Slope homes in a region with a uranium mining history.
Radon mitigation in Breckenridge
High-country homes, cabins and short-term rentals.
Radon mitigation in Durango
Southwest Colorado homes with crawlspaces and mountain lots.
How it works
From radon test to a protected home
Test your home
Use a short-term test kit (free from CDPHE while supplies last) or hire a certified tester. The EPA recommends fixing homes at 4.0 pCi/L or higher.
Compare certified pros
Request quotes from two or three certified contractors in your city. Ask what system they recommend, where the pipe will run and what the warranty covers.
Install and retest
Most systems are installed in a day. A follow-up test should confirm the level dropped below 4.0 pCi/L. Retest every two years after that.
Radon mitigation cost
What a radon system costs in Colorado
Most Front Range homeowners pay $1,000 to $2,500 for a standard active sub-slab depressurization system. Your foundation type is the biggest factor.
| Home type | Typical cost | What it covers |
|---|---|---|
| Unfinished basement | $1,000 to $1,800 | Pipe can run straight up through the house or garage with little finish work. |
| Finished basement | $1,400 to $2,500 | Adds $200 to $500 to route pipe through closets, chases or the garage. |
| Slab-on-grade | $1,400 to $2,500 | Adds $200 to $500 for exterior routing and insulated pipe. |
| Crawlspace | $1,500 to $2,800 | Adds $300 to $800 for a sealed vapor barrier with suction underneath. |
Choosing a contractor
How to choose a radon mitigation company
Check the license and certification. Since 2022, Colorado has required radon testing and mitigation professionals to hold a state license from the Department of Regulatory Agencies (DORA). Ask for the Colorado license number, and look for certification from the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB).
Get it in writing. A good quote states the system type, number of suction points, fan model, pipe route, post-mitigation test and warranty.
Expect a follow-up test. The installer should confirm your level dropped below 4.0 pCi/L. Most target under 2.0 pCi/L.
Ask about the fan warranty. Fans typically last 5 to 10 years. Many contractors warranty the fan for 5 years and the system workmanship for longer.
Radon questions Colorado homeowners ask
What is a safe radon level?
The EPA recommends fixing a home at 4.0 picocuries per liter (pCi/L) or higher, and recommends considering mitigation between 2.0 and 4.0 pCi/L. There is no known safe level of radon exposure.
How much does radon mitigation cost in Colorado?
Most Colorado homeowners pay $1,000 to $2,500 for a standard active sub-slab depressurization system. Crawlspaces, finished basements and mountain homes can cost more. See our full cost guide for details.
How do I choose a radon mitigation company?
Colorado requires radon mitigation professionals to be licensed by the Department of Regulatory Agencies (DORA). Ask for the Colorado license number, look for NRPP or NRSB certification, get a written quote that includes a post-mitigation test, and ask about the fan warranty.
How common is radon in Colorado?
Very common. The Colorado Department of Public Health and Environment (CDPHE) reports that about half of Colorado homes have radon above the EPA action level, and radon is linked to more than 500 lung cancer deaths in Colorado each year.
Is there help paying for radon mitigation?
CDPHE runs a Low-Income Radon Mitigation Assistance program for qualifying homeowners and gives out free test kits while supplies last. Details are at coloradoradon.info.
Are you a Colorado radon professional?
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