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Radon test kits

EPA describes two types of tests: short-term (2–90 days, often charcoal canisters) and long-term (more than 90 days; more likely to reflect your year-round average). Source: EPA A Citizen’s Guide to Radon.

Many state radon programs offer free or discounted kits. Check yours via EPA’s state program list.

What to look for in a radon test
  • Short-term kits (2–7 days) give a quick first reading; good for screening or real-estate timelines.
  • Long-term kits (90+ days) better reflect your year-round average, since radon swings with weather and season.
  • Continuous digital monitors show ongoing readings and are handy for checking a mitigation system over time.
  • Choose a kit analyzed by a certified lab (look for NRPP or NRSB listing) with lab fees and return postage stated up front.
  • Follow the instructions exactly: lowest lived-in level, closed-house conditions, correct exposure time, and mail it back promptly.
  • After mitigation, retest to confirm levels dropped.

We don’t list prices here until we can cite them from a live product page.