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.
Radon is prevalent in Colorado and in Boulder County. One out of every two homes in Boulder County has elevated radon levels. The EPA has ranked Boulder County as “Zone 1,” which means the average house will likely exceed the EPA’s action level of 4.0 pCi/L.
A Citizen's Guide to Radon (English)
A Citizen's Guide to Radon (Spanish)
Learn more about radon health risks from Boulder County Public Health and the United States Environmental Protection Agency
Download a FREE radon test kit coupon at https://environmentalrecords.colorado.gov/HPRMWebDrawerHM/RecordHtml/403292 .
Read the City Council Colorado Radon Action Month Proclamation