Who Should Conduct Post-Remediation Testing?
Post-remediation testing should be conducted by a third party — not the remediation company that did the work. This separation of roles ensures the results are objective. Hire a certified industrial hygienist (CIH), certified mold inspector, or environmental testing laboratory to collect and analyze samples. The results form the basis for a clearance certificate.
What Does Post-Remediation Testing Measure?
Post-remediation testing typically includes: air sampling inside the remediated space compared to outdoor control samples, visual inspection confirming no visible mold remains, and moisture readings confirming materials are at acceptable moisture content. Some projects also include surface samples from previously affected areas to confirm decontamination.
Passing vs. Failing Post-Remediation Clearance
A passing result means indoor air quality is comparable to outdoor conditions with no elevated levels of water-damage-associated mold species. A failing result means the remediation was incomplete — either mold source materials remain, or cross-contamination occurred during the work. Failing clearance requires additional remediation before re-occupancy.
The Clearance Certificate
A clearance certificate documents the post-remediation test results and certifies that the space has been restored to normal conditions. This document is valuable for insurance records, future property sales, and occupant peace of mind. Request a written clearance certificate from your testing professional after a passing result.
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