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Best Radon Mitigation Companies in York, PAFive radon mitigation companies that serve York, PA and the towns around it, what sets each one apart, and how to reach them.Radon in York County homes: testing, fixing and who can do itWhy radon shows up in so many York County basements, how to test, what a fix involves and how to check that a tester or mitigator is DEP-certified.How to check a contractor's registration in PennsylvaniaPennsylvania registers home improvement contractors instead of licensing them. Here's how to look one up and what the number does and doesn't tell you.