Radon Testing Guides: How to Test Your Home

Testing is the only way to know your home’s radon level. The guides below cover choosing a test, setting it up so the result is reliable, and deciding what to do with the number. EPA recommends fixing a home at 4 pCi/L or more and considering it between 2 and 4 pCi/L (EPA, A Citizen’s Guide to Radon).

To see how often tests in your area come back high, look up your county, or browse the radon mitigation cost page if your home needs fixing.

Guides in this section

How to test for radonShort-term and long-term radon tests, where to place a kit, how to read the result, and what changes when you are buying or selling a home.
Radon levels explainedWhat radon numbers mean, EPA's 4 pCi/L action level, the WHO reference level, converting pCi/L to Bq/m³, and the lifetime lung cancer risk at each level.
Where to buy a radon test kitWhere to get a radon test kit, from home improvement stores and online to discounted and free state kits, and what to check before you buy one.

Check your county

See the share of radon tests at or above 4 pCi/L where you live, from state and CDC test records.