The United States Department of Housing and Urban Development (HUD) released the new version of the Multifamily Accelerated Processing (MAP) guidance in March of this year. This guidance applies to all projects except those that are “categorically excluded not subject to related laws and authorities” (CENST), although radon testing is still encouraged for these excluded projects.
Section 220.127.116.11 of the 2021 MAP guidance now requires radon testing in 100% of ground contact units and 10% of the units on each floor above ground level. Previously, only a minimum of 25% of ground contact units were required to be tested.
All testing is still required to be conducted by a radon professional certified by the American Association of Radon Scientists and Technologists (AARST), National Radon
Proficiency Program (NRPP) or the National Radon Safety Board (NRSB). All testing is still required to be conducted in accordance with the AARST Protocol for Conducting Measurements of Radon and Radon Decay Products in Multifamily Buildings (ANSI-AARST-MAMF-2017).
Information provided by ASTI Environmental