how to verify radon contractor 3

https://radonlevelspennsylvaniastore.inkharbory.com/posts/new-findings-raise-questions-about-radon-levels-in-pennsylvania

To verify a radon contractor, start by checking their state certification or license, which is often required through a radon proficiency program like the NRPP or AARST. Ask for proof of certification and recent test results, then look up their standing with your state's radon office. It's also smart to request references from past jobs and confirm they have liability insurance. Avoid contractors who pressure you into expensive mitigation without a thorough initial test.