Jon Shaffer is a radon mitigation provider based in Pittsburgh, PA, credentialed by PA DEP.
PA DEP certified mitigation ID 2499 (Shaffer, Jon)
https://files.dep.state.pa.us/RadiationProtection/RadonDivision/RDPortalFiles/2026/10_01/WebMitigationAlpha.pdf (list dated 2026-10-01)
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