The Federal Housing Finance Agency (FHFA) Recently Announced Changes to Fannie Mae and Freddie Mac’s Multifamily Radon Standards

By Partner Engineering and Science, Inc.

Details regarding policy guidance including exemptions can be found here : Blog | Federal Housing Finance Agency FHFA Increases Radon Testing Requirements at Enterprise-Backed Multifamily Properties

Several states require licensed professionals to follow specific protocols for testing of multifamily buildings.  Two states have state-specific protocols while eight states have fully adopted the EPA-recognized radon standard of practice for testing multifamily buildings (see graphic below).  This standard is identified as the “American National Standards Institute and American Association of Radon Scientist and Technologists (ANSI/AARST) Standard: Protocol for Conducting Measurements of Radon and Radon Decay Products in Multifamily Buildings (ANSI/AARST MAMF-Rev -2021)”.  According to the protocol, testing locations include all ground-contact dwellings as defined within the MAMF-Rev-2021, large rooms or open areas (one every 2,000 square feet), as well as other ground contact (non-residential) rooms that are regularly occupiable, and 10% of upper floors.

State Programs

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