How Often Should I Check My House for Radon Gas?


Frequent Tests Are Unnecessary

  • Radon is a naturally occurring gas that is derived from radioactive uranium. Because radon is a product of geology, which shifts only slowly over time, a single test for the presence of radon in a home, properly performed, should provide sufficient assurance that the home will remain radon free for the near future.

Radon Can Find New Ways In

  • Although the presence of radon in the earth around a house will not change, according to the U.S. Environmental Protection Agency, radon can enter through cracks in floors or walls, construction joints and the water supply. The structure of a house can shift over time, allowing radon to find new ways in.

Bottom Line

  • At a minimum test every couple of years; however earthquakeserious remodeling or a fire and seasons may change radon levels. The EPA provides an additional long-term test that creates an average over time.

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  • Photo Credit Toxic hazard flag image by Stasys Eidiejus from
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