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Why a Radon Retest After Mitigation Is a Critical Step for St. Louis Homes
@radonretestaftermitigationdeck · 10 October 2026
The Hidden Risk After Mitigation When you buy a home in St. Louis, you expect the radon test to tell you whether the air is safe. If the reading comes back above the EPA's Action Level of 4.0 picocuries per liter, you hire a remediation contractor to install a mitigation system. That system might involve sub-slab depressurization, a radon fan, and sealing cracks in the basement floor. You feel relieved when the work is done. But the story does not end there. A radon retest
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