Radon comes from the natural radioactive breakdown of uranium in soil, rock, and water. It is an invisible, odorless, tasteless, cancer-causing gas that enters buildings through the numerous cracks, holes, and pipes in the foundation. It can also enter a building from well water.
Radon can be found in any building, but homes are the most concerning since that’s where families spend the most time.
Approximately 50 percent of homes in Colorado have elevated radon levels. The EPA has ranked Denver as "Zone 1," which means the average house will likely exceed the EPA's action level of 4.0 pCi/L.
Testing the radon levels in your home is the first step to know if you should mitigate and protect yourself from unnecessary exposure to harmful radon gas.
The Denver Department of Public Health & Environment now has radon testing kits available to residents, free of charge!
To obtain your free radon test kit, please contact 3 1 1 (720-913-1311).
On January 1, 2019, Mayor Michael B. Hancock signed a proclamation (PDF) declaring January 1-31, 2019 National Radon Awareness Month in the City and County of Denver.
Radon breaks down into radioactive particles that can cause cancer when inhaled. These radioactive particles can damage the cells in our lungs and increase the risk of lung cancer.
Radon is the leading cause of lung cancer among non-smokers. It is estimated to cause about 21,000 lung cancer deaths per year and about $2 billion in medical expenses and lost productivity. The Iowa Radon Lung Cancer Study tracked nearly 1,000 women who had lived in their homes more than 20 years. The results of the case-control study (after adjusting for age, smoking, and other factors) indicated that a 20-year exposure of radon levels at the EPA guideline of 4.0 pCi/L yielded an increased lung cancer risk of 50 percent.
Smokers exposed to high concentrations of radon have an even greater risk of developing lung cancer than being exposed to either substance individually. The risk of lung cancer from radon gas is estimated to be approximately 10-15 times greater for persons who smoke cigarettes in comparison with those who have never smoked. Get help quitting tobacco.
The following video features Johanna Carpine of Wellington, Colorado. She was diagnosed with radon-related lung cancer in 2013. After a two-year battle, Johanna died on August 21, 2015.
Summer Hours (April through October)
Monday – Friday
7:30 a.m. – 4:30 p.m.
Winter hours (November through March)
Monday – Friday
7:30 a.m. – 4:00 p.m.
101 W Colfax Ave., 8th Floor
Denver, CO 80202
Denver 311 Help Center Call 3-1-1
Outside Denver Call 720-913-1311