Radon Testing in Denver
Testing is the only way to know your home's radon level [1][3]. You can use an approved do-it-yourself test or hire a licensed radon measurement professional [2].
Short-term vs. long-term tests
- Short-term tests stay in place for about 2 to 90 days, depending on the device. They are quick, but radon levels vary day to day and season to season [1].
- Long-term tests stay in place for more than 90 days and give a better picture of your year-round average [1].
EPA's guidance: if a short-term test shows 4 pCi/L or more, follow up with a second test; a long-term follow-up gives a better year-round picture, a second short-term test is quicker [1].
Test tips
- Test in the lowest lived-in level of the home [1].
- Keep exterior doors and windows closed during a short-term test, as CDPHE advises [3].
- CDPHE periodically offers free test kits to Colorado residents while supplies last [3].
Professional testing
For real-estate deadlines, CDPHE encourages buyers to hire a licensed radon measurement professional using a continuous radon monitor or other approved device [2]. See radon during a home sale.
Common questions
How long does a radon test take?
Short-term tests run roughly 2 to 90 days; long-term tests run more than 90 days.
Where do I put the test?
In the lowest level of the home that is used as living space.