The mitigator's warranty guarantees the radon level is less than 4.0 pCi/L. Why do I need a post-mitigation test?

A. The mitigation contractor's warranty guarantees that the system will reduce radon levels to less than 4.0 pCi/L, when tested in accordance with the Measurement Protocol, 32 Illinois Administrative Code 422.130. Diagnostic testing, conducted by the mitigator may suggest that the radon level has been successfully lowered, but the only way to know that the system achieves the sought reduction is to perform a post-mitigation test in accordance with regulations.

Relying on diagnostic testing that is neither standardized nor in accordance with regulatory requirements undermines the mitigation process. Further, it fails to document system performance and to activate your warranty in the event of system failure. More.

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