The 2026 National Defense Authorization Act directs the Secretary of Defense to develop and implement uniform mold remediation guidelines for military housing, facilities, and other real property “consistent with industry standards,” with the ANSI/IICRC S520 Standard for Professional Mold Remediation specifically named. The inclusion is the most significant federal recognition the standard has received to date and follows years of complaints from military families about mold in base housing.
S520 has long been the leading US consensus document for how mold remediation should be conducted — including how to determine contamination conditions, plan a remediation response, and confirm successful completion. Naming it as the reference for the Department of Defense's housing portfolio creates clearer pressure on contractors to follow the standard's requirements rather than improvising scopes of work.
The current edition, ANSI/IICRC S520-2024, is the fourth revision of the standard. The 2024 update added “mycotoxins” and “ECM” (Erosion Containment Module-related terminology) to its condition definitions, introduced “airborne” as a defined condition, and called direct attention to the finding that most mold remediation firms are not correctly insured for the work they perform.