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Home Radon Testing: What to Check Before Your First Test

Radon has no warning smell. Choose an appropriate test, place it correctly and interpret results using applicable local guidance.

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Radon is a radioactive gas from the ground that may accumulate indoors. The US EPA recommends testing homes and professional mitigation when levels are high. Standards and certified test providers vary by jurisdiction; US action levels are not automatically local legal limits.

Your try-it-at-home checklist

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1. Consult your local environment or public-health authority for recognized test methods, device requirements and action guidance.
2. Understand short-term versus long-term tests: radon varies by season and weather, so longer tests may better reflect annual exposure.
3. Follow the kit instructions for an appropriate regularly occupied room on the lowest lived-in level; avoid unusually humid or drafty locations.
4. Record the test start and finish, comply with the kit's duration and ventilation conditions, and do not move the device during testing.
5. If the result is elevated, follow local recommendations for a confirmatory test and expert advice rather than attempting to interpret or fix it yourself.
6. Have qualified specialists perform any needed mitigation and re-test after the work to confirm its effect.

Your try-it-at-home checklist

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