Should I test my home for radon in Colorado?

Yes, absolutely. Colorado is Zone 1 (highest risk). The EPA recommends every home be tested, and in Zone 1 states it is especially urgent.

Last updated: 2026-05-23

Colorado Indoor Air Quality Guide

EPA Radon Zone 1 — HIGH RISK Population: 5.8M

Colorado has the 4th highest radon levels in the US — all 64 counties are Zone 1

Zone 1 — Highest potential (predicted average > 4 pCi/L)

Radon Levels in Colorado

Average Radon Level

6.8 pCi/L

EPA Zone

Zone 1

Colorado is entirely Zone 1 — the entire state has high radon potential due to uranium-rich geological formations. All homes should be tested.

⚠️ Testing strongly recommended

Colorado is Zone 1 — the highest risk category. Test every home. If levels are 4 pCi/L or above, install a mitigation system immediately.

Top Indoor Air Hazards in Colorado

Radon Gas

CRITICAL

Radon is the #2 cause of lung cancer after smoking. It seeps from soil into basements and crawl spaces. You cannot see, smell, or taste it. The only way to know is to test.

Carbon Monoxide (CO)

CRITICAL

CO is a silent killer — colorless, odorless, and lethal at high concentrations. It binds to hemoglobin 200x more than oxygen. Every home with fuel-burning appliances needs a CO detector.

Formaldehyde (VOC)

HIGH RISK

Formaldehyde off-gases from pressed wood furniture, flooring, and new construction materials. It is classified as a known human carcinogen by the IARC. Levels are highest in new or recently renovated homes.

Colorado Climate & Air Quality Factors

High altitude means more heating days and tighter homes. Dry climate reduces mold but wildfires are frequent and severe. Radon is the #1 indoor air concern.

Recommended Products for Colorado Homes

First Alert Radon Gas Test Kit

EPA-listed short-term radon test. Lab fees included. Results in days.

Airthings Corentium Home Radon Detector

Continuous digital radon monitoring. No lab fees. Real-time readings.

RadonAway RP140 Radon Mitigation Fan

Professional-grade radon mitigation fan. 4-inch. The core component of any radon reduction system. Cuts radon levels by up to 99%.

Kidde Carbon Monoxide Detector

Plug-in CO alarm with battery backup. Digital display. Peak level memory.

🏠 Scan Your Home

Room-by-room hazard scanner — find dangers in your Colorado home

📋 Air Quality Quiz

2-minute risk assessment — get your home's danger score

Disclaimer

State-level radon data from EPA Zone Map. Individual home levels vary significantly. This guide is for educational purposes and not a substitute for professional environmental testing. Test your home regardless of zone designation.

Guidance sourced from EPA, CDC, and Health Canada publications.