Testing
Which test suits which situation, how to place it, how long to run it, and when a DEP-certified tester is required rather than a do-it-yourself kit.
Choosing a Contractor
How to verify Pennsylvania DEP certification, what an itemised mitigation quote should contain, and the questions that separate a considered proposal from a number on a page.
Understanding Your Result
At or above 4 pCi/L, the EPA recommends action. Between 2 and 4 pCi/L, mitigation is worth considering. No level is regarded as entirely without risk, and levels fluctuate — which is why a borderline short-term result is usually worth confirming with a long-term test.
After Mitigation
Post-mitigation testing, what to do if the system does not achieve the target, fan warranties and lifespan, and how often to retest thereafter.
Where to Start
If you have not tested, start with the testing guide. It covers which kind of test suits which situation, where to place it, how long to run it, and when Pennsylvania requires a DEP-certified tester rather than a do-it-yourself kit.
If you have a result at or above 4 picocuries per litre and are ready to hire someone, start with the contractor guide. It covers verifying DEP certification, what an itemised quote should contain, and what a contractor's obligation should be if the post-mitigation test does not hit the target.
Questions About Radon?
Ask about a test result, a mitigation quote, or verifying a contractor’s DEP certification.