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radon retest after repair 3

https://getradonsysteminspectionspace.readspirex.com/posts/why-a-radon-system-inspection-matters-for-your-st.-louis-home

After you've hired a contractor to fix a radon problem in your home, you need to wait at least 24 hours—or per your state guidelines—then place test kits in the same spots as your initial tests. The retest should run for at least 48 hours, preferably during the same season, to confirm the mitigation system actually brought your indoor radon levels to an acceptable range.