D. Testing Protocols :

HUD Multifamily Accelerated Processing (MAP) Guide, HUD Handbook 4430.G (2020 ed., rev. Mar. 19, 2021) · 2026 edition · updated 2026-10-05 · United States

Radon testing must follow the protocols set by the American Association of Radon Scientists and Technologists, Protocol for Conducting Radon and Radon Decay Product Measurements in Multifamily Buildings (ANSI-AARST MAMF-2017) (available at www.standards.aarst.org). This includes testing 100% of ground floor units and 10% of upper floor units in all buildings included in the project.
As an alternative to a full testing assessment, all ground level units/rooms in all buildings included in the project must be mitigated following the appropriate mitigation standard listed at Section 9.6.3.2.F.
The threshold for unacceptability is 4.0 picocuries per liter (4.0 pCi/L) based on initial and any confirmatory testing, if performed.

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Chapter 9 Environmental Review and Requirements 9.6 Environmental Laws and Authorities

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▸Contents — HUD Multifamily Accelerated Processing (MAP) Guide, HUD Handbook 4430.G (2020 ed., rev. Mar. 19, 2021)

HUD Multifamily Accelerated Processing (MAP) Guide, HUD Handbook 4430.G (2020 ed., rev. Mar. 19, 2021)

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