What This Means for Denver Homeowners
Denver County, CO is classified as EPA Radon Zone 1, indicating high radon risk. Indoor radon levels in Denver homes average 6.2 pCi/L.
⚠️ High Risk Area - Testing Strongly Recommended
The EPA recommends that all homes in Zone 1 areas be tested for radon. Average levels above 4 pCi/L mean a significant percentage of Denver homes require mitigation. Testing is the only way to know your specific exposure.
Understanding EPA Radon Zones
The EPA predicts average indoor radon levels above 4 pCi/L in Zone 1 counties. This is the highest radon risk classification.
EPA Radon Zone Classification:
Zone 1 (Highest Potential)
Predicted: >4 pCi/LCounties with highest radon potential. EPA recommends testing and mitigation if levels exceed 4 pCi/L.
Zone 2 (Moderate Potential)
Predicted: 2-4 pCi/LModerate radon levels. Many homes still test above action level. Testing recommended.
Zone 3 (Low Potential)
Predicted: <2 pCi/LLower average levels, but high radon possible in individual homes. Testing still recommended.
Important: Zones Are County Averages, Not Guarantees
EPA zones predict average radon levels across an entire county. Two identical homes on the same street can have drastically different radon levels due to variations in soil composition, foundation construction, and ventilation patterns. The only way to know your home's radon level is to test.
Why Denver Has High Radon Risk
Denver sits in a geographic region with uranium-rich soil and bedrock. As uranium naturally decays, it releases radon gas that seeps into homes through foundation cracks, sump pits, and construction joints.
Common Radon Entry Points in Denver Homes:
- • Foundation cracks: Settling over time creates pathways for radon gas
- • Sump pump pits: Direct opening to soil beneath your home
- • Construction joints: Gaps where walls meet floors
- • Utility penetrations: Pipes and cables entering through foundation
- • Crawl spaces: Dirt floors allow continuous radon entry
Radon Testing in Denver: What You Need to Know
The EPA and Surgeon General recommend that all homes be tested for radon, regardless of zone classification. Testing is especially critical in Denver given the high risk level.
When Denver Homeowners Should Test:
Before buying a home
Include radon testing in your inspection contingency
Every 2 years in existing homes
Radon levels change over time with settling and soil conditions
After renovations or foundation work
Construction can alter radon entry points and air pressure
After flooding or water damage
Soil saturation and foundation cracks can increase radon
Not Sure Which Radon Test Kit to Buy?
We analyzed the top 5 EPA-approved radon test kits sold on Amazon, comparing accuracy, speed, lab fees, and real customer reviews from Denver residents. Our buying guide shows you which kit is right for your situation.
Compare Best Radon Test KitsRadon Mitigation Costs in Denver
If your radon test shows levels at or above 4 pCi/L, professional mitigation is recommended. Radon mitigation systems in Denver typically cost $800-2,500 depending on your home's foundation type and the number of suction points required.
Typical Denver Mitigation Costs:
Annual operating costs:
- • Electricity for fan: $50-150/year (runs 24/7)
- • Maintenance: Minimal—fan replacement every 10-15 years
- • Annual testing: $15-30 to verify system is working
How Effective Is Mitigation?
Professional radon mitigation systems reduce radon levels by 90-99%. Most Denverhomes drop from 6-10 pCi/L down to 0.5-2 pCi/L after installation. Systems work immediately—radon levels begin dropping within hours of turning on the fan.
Get Free Denver Radon Mitigation Quotes
Connect with certified radon mitigation contractors in Denver. Get 2-3 quotes, compare warranties and pricing, choose the best fit for your home.
Request Free Quotes →Average response time: 24-48 hours • Denver-area contractors only
Related Resources:
Protect Your Denver Home from Radon
Testing takes 2 days. Mitigation takes 3-6 hours. Peace of mind lasts a lifetime.