Radon Mitigation in Denver, CO

Radon Mitigation in Denver, Colorado

Denver sits on the eastern edge of the Rocky Mountain Front Range, where uranium-bearing granite bedrock and glacial outwash deposits push indoor radon levels well above the national average. Colorado's statewide average of 6.6 pCi/L is already more than double the EPA action level of 4 pCi/L, and Denver metro homes — particularly those with finished basements — frequently test between 5 and 20 pCi/L.

Why Denver Has Such High Radon Levels

Colorado is EPA Radon Zone 1, the highest designation. Denver-area homes sit directly above uranium-rich granite bedrock that produces radon gas continuously. The Front Range granite, exposed in the nearby Rocky Mountains, extends underground throughout the Denver metro and eastern Colorado. Glacial deposits that cover much of the Denver area provide excellent pathways for radon gas to migrate from soil into homes.

Most Denver homes are slab-on-grade or have poured concrete basements sitting directly on these radon-producing soils. The combination of geology and modern construction means even newer, tightly-sealed homes in Cherry Creek, Capitol Hill, and suburban areas like Littleton and Thornton accumulate radon efficiently during winter months when homes are sealed.

What Radon Mitigation Costs in Denver

A standard radon mitigation system in Denver costs $1,200 to $2,500 for most homes. This includes:

• Sub-slab depressurization system installation (the most effective method for Colorado's slab homes)
• A single suction point drilled through the concrete slab
• PVC piping routed through the home and vented safely above the roofline
• A radon fan installed in the attic or exterior wall
• Complete system testing and EPA certification

Factors that increase cost:

• Multiple suction points ($200-$400 each) for homes with garages, additions, or poor sub-slab communication
• Finished basement routing ($300-$500 extra) if pipe must run through finished walls or ceilings
• Complex crawl spaces (some Denver homes have partial crawls) — significantly higher, often $2,500-$4,000+

Most Denver slab homes can be mitigated in 4-6 hours by an experienced contractor. Finished basements may take longer if routing is complex.

Why NRPP and NRSB Certification Matters

When hiring a radon mitigator in Denver, verify that the contractor holds current NRPP (National Radon Proficiency Program) or NRSB (National Radon Safety Board) certification. Colorado does not require state licensing for radon contractors, making independent credentials essential.

A certified mitigator will:

• Perform a sub-slab communication test before designing the system
• Size the system appropriately for your home's sub-slab conditions
• Install the system to EPA standards
• Provide post-mitigation testing to verify effectiveness
• Offer a warranty (typically 1-5 years on parts and labor)

Denver's competitive contractor market means multiple certified options are usually available. Getting 2-3 competing bids is normal and typically saves $200-$500.

How to Get Started

Step 1: Test Your Home

If you haven't tested in the past 2 years, order a radon test kit from a certified lab (EPA.gov has a list) or hire a contractor for a professional test. Denver homes typically test in 24-48 hours. Cost: $15-$30 for DIY, $150-$300 for professional testing.

Step 2: Interpret Results

Results are measured in pCi/L (picocuries per liter). The EPA action level is 4 pCi/L. If your home tests above 4 pCi/L, mitigation is recommended. Most Denver homes test above this level.

Step 3: Get Mitigator Quotes

Contact 2-3 NRPP or NRSB-certified mitigators in your area. Share your test results and home details (foundation type, square footage, basement layout). Most contractors provide free estimates.

Step 4: Choose and Install

Most Denver mitigation jobs are scheduled within 1-2 weeks. Installation typically takes one day. The contractor will test the system post-installation to confirm effectiveness.

Finding a Certified Mitigator in Denver

Find a Certified Mitigator in Denver →

Denver is Colorado's largest radon market with over 160 certified contractors in our directory. Average installation cost is $1,200-$2,500. Most jobs complete in a single day, and homeowners typically see radon levels drop below 2 pCi/L after mitigation.

The EPA estimates that approximately one in three Colorado homes above the Denver area has radon at or above the action level. Testing and mitigation are now considered standard home maintenance in the Denver market, and most home buyers factor in testing and potential mitigation costs during purchase decisions.

Testing today could prevent years of radon exposure for your family.