EPA recommends testing every home below the third floor. Free test kits are sometimes available from local or county health departments or state radon programs. Reads 4 pCi/L or more? EPA says to confirm with a follow-up test, then fix it (and consider fixing from 2 to 4). Before paying for mitigation, confirm with a qualified radon tester, and use a qualified or state-certified mitigator (in New Jersey, NJDEP-certified).
First Alert RD1 radon gas test kit, lab fee included: A 2–4 day test you mail to a lab. The lab fee is included, except New Jersey's state fee.