10/22/2026
Half of Colorado homes have radon levels above the EPA’s recommended action level.
Radon is invisible and odorless. CDPHE says it has been found throughout Colorado, and testing is the only way to know a home’s level.
A finished basement, newer construction, a neighbor’s result, or an old test does not replace current information for the property.
Buyer and seller checklist:
1. Ask for the test date and result.
2. Review mitigation-system records.
3. Coordinate any needed testing with contract deadlines.
4. If the result is 4 pCi/L or higher, follow CDPHE/EPA guidance and use a licensed professional.
Comment RADON and we’ll send Colorado’s official testing and contractor resources.
Sources: Colorado Department of Public Health and Environment; U.S. EPA.
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