PA DEP certified radon 5

https://getbuiltdepstandardspro.fairmontdigest.com/posts/why-radon-mitigation-systems-must-be-built-to-dep-standards

PA DEP certified radon means a professional has completed state-approved training to accurately test for radon gas in homes and buildings. When you see that certification, you know they follow strict protocols for placement of test devices and lab analysis. This matters because radon is a radioactive gas that can seep in from soil and increase lung cancer risk over time. Having someone properly certified gives you reliable results you can actually trust to protect your family's health.