9.4 Contamination and Toxic Substances
HUD Multifamily Accelerated Processing (MAP) Guide, HUD Handbook 4430.G (2020 ed., rev. Mar. 19, 2021) · 2026 edition · updated 2026-10-05 · United States
A. The purpose of the requirements of this section is to identify manmade contamination on a site, other than contamination from in-place building components such as asbestos containing materials (but see Section 9.6.2) or lead-based paint (but see Section 9.6.1), and to ensure that any contamination so identified is mitigated to the point where it would be unlikely to “affect the health and safety of occupants or conflict with the intended utilization of the property” as stated in HUD-wide policy at 24 CFR 50.3(i)(1). Laboratory analysis may reveal naturally occurring contaminants in the pathway vectors (air, water, groundwater, soil or sediment) surrounding the proposed HUD-assisted project at levels that pose a health or safety risk to sensitive receptors. Mitigation might be required depending on the intended use of the proposed project, the direction, the transmissivity, the proximity and the use of the pathway vectors with respect to the location of the proposed project. Specific requirements for radon are described in Section 9.6.3.
B. Lenders are strongly encouraged to request a HUD concept meeting to discuss any potential contamination issues. It is recommended that Lenders consult with HUD before preparing an ASTM E1903-19 “Standard Practice for Environmental Site Assessments: Phase II Environmental Site Assessment Process (Phase II ESA).”
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Chapter 9 Environmental Review and Requirements 9.4 Contamination and Toxic Substances
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