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Denver Metro, CO Radon Information

The Denver Metro metropolitan area in Colorado has a regional average radon level of 9.1 pCi/L based on 70 user-submitted tests. This exceeds the EPA’s recommended action level of 4.0 pCi/L, meaning radon testing and professional mitigation should be a priority for homeowners across the region.

Radon is a naturally occurring radioactive gas produced by the decay of uranium in soil and bedrock. In the Denver Metro area, local geology and common residential construction—particularly homes with basements and crawlspaces—allow radon to seep indoors and accumulate to dangerous concentrations. Particularly high readings have been recorded in communities like Fairplay, Denver, Aurora, where professional radon testing and mitigation services are strongly recommended.

Whether you are buying a home, selling a property, or simply want to protect your family, a professional radon test is the only way to know your home’s levels. If elevated radon is found, a licensed mitigation contractor can install a sub-slab depressurization system—typically in one day—to reduce levels by up to 99%. Request a free radon mitigation quote

The regional average is 9.1 pCi/L — above the EPA action level of 4.0 pCi/L. Testing and mitigation are strongly recommended.
9.1
Avg. pCi/L
28
Cities
70
User Tests
Zone 1
EPA Rating
Above EPA Action Level
Below EPA Action Level

Top 5 Radon Hotspots in the Denver Metro Area

Cities with the highest average user-submitted radon readings in the Denver Metro metropolitan area.

Rank City Avg. Radon Level Tests
1 Fairplay
12.00 pCi/L
9
2 Denver
6.20 pCi/L
9
3 Aurora
7.40 pCi/L
5
4 Parker
5.40 pCi/L
5
5 Black Hawk
13.00 pCi/L
4

Other Metro Areas in Colorado

Explore radon data for other metropolitan regions across the state.

Boulder Metro
View radon data
Colorado Springs Metro
View radon data
Fort Collins Metro
View radon data
Grand Junction Metro
View radon data
Greeley Metro
View radon data
Pueblo Metro
View radon data

Cities in the Denver Metro Area

28 cities and towns in the Denver Metro metropolitan area with user-submitted radon data.

28 cities

Radon Mitigation Professionals Serving the Denver Metro Area

Licensed contractors who serve this metro area.

Company
#1 Radon Inc
1st Step Home Inspections LLC
A Precision Radon Testing
Aames Radon
Aames Radon
Above and Beyond Property Inspections LLC
ACE Radon
ACE Radon
Ace Radon Company
Advanced Radon Mitigation Inc
Affordable Radon LLC
AG Wassenaar Inc
Air Aware Radon Testing Services
Air Radon
All Colorado Radon Mitigation Inc
All Equity Inspections LLC
Alpenrose Radon Testing Services
Alpha Home Inspections LLC
APEX Radon
Appreciation Home Inspections
AsbesTech
Axium Radon Mitigations
Bailey Professional Solutions
Breathe Easy Radon
Bucholtz Inspection Engineer & Services LLC
Colorado Dept. of Public Health & Environment
Colorado Hazard Control LLC
Colorado Mountain Radon LLC
Colorado Peace of Mind Home Inspection
Comfort Home Inspection Services Inc
DCT of Colorado
Defender Radon Systems
Denver Metro Radon Testing LLC
Denver Radon Testing
Freedom Radon Solutions
FRI-Front Range Real Estate Inspectors Inc
Front Line Radon
Front Range Radon LLC
Full Spectrum Inspections LLC
Home Inspection Pros LLC
Inspect-It 1st
Inspectrum
Inspex Home Inspections LLC
L & R Plumbing LLC
Legacy Home Inspections
Magpie Property Inspections LLC
Mountain Mitigations
National Property Inspections of Colorado
Professional Advantage Radon Mitigation & Measurement Provider
Radon Engineering Consultants East Inc
Radon Seal LLC
Radon-I-Nator LLC
RamGam Radon Services LLC
RDS Environmental Inc
Rocky Mountain Radon Control Inc
S.W.A.T. Environmental
S.W.A.T. Environmental
The Radon Guys LLC
Turnstone Home Inspections LLC
US Inspect LLC
US Inspect LLC
USA Home Inspections
Waddle Radon

Frequently Asked Questions about Radon in the Denver Metro Area

Common questions about radon testing, mitigation costs, and health risks for homeowners in the Denver Metro metropolitan area.

Why are radon levels so high in the Denver Metro area?
Radon levels in the Denver Metro area are driven by the local soil and bedrock composition, which contains naturally occurring uranium. As uranium decays, it produces radon gas that migrates upward through the soil and enters homes through foundation cracks, sump pits, and gaps around pipes. Homes with basements and crawlspaces are especially susceptible because these below-grade spaces are in direct contact with the soil where radon concentrations are highest.
How much does radon mitigation cost in Denver Metro?
Professional radon mitigation in the Denver Metro metropolitan area typically costs between $800 and $2,500, depending on the size and construction of your home. The most common approach is an active sub-slab depressurization system, which a certified contractor can usually install in a single day. Ongoing energy costs for the mitigation fan are minimal—roughly $5–$10 per month—and most systems reduce radon levels by 90% or more.
Are landlords in Colorado required to test for radon?
Radon testing and disclosure requirements vary by state and municipality. Some Colorado jurisdictions require landlords to disclose known radon levels or test results, while others have no mandate. Regardless of local law, the EPA recommends radon testing for all residential properties—including rentals—since radon is the second leading cause of lung cancer in the United States.
Can I sell a house with high radon levels in the Denver Metro area?
Yes. High radon levels do not prevent a home sale, but buyers in the Denver Metro market routinely request radon testing during the inspection period. If levels exceed 4.0 pCi/L, the buyer may negotiate for the seller to install a mitigation system before closing. Having a radon mitigation system already in place can actually be a selling point, demonstrating proactive home maintenance and providing documented proof of safe indoor air quality.