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F. Mitigation Standards :

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

  1. Radon resistant construction is required for all new construction, and radon mitigation is required for existing construction where testing has revealed that radon levels exceed the threshold for unacceptability. The radon resistant construction or radon mitigation, when required, must conform to the following standards, which include post-mitigation testing requirements. All standards listed below are available at www.standards.aarst.org .

For existing buildings:

    1. Multifamily structures reference ANSI-AARST RMS-MF 2018, Radon Mitigation Standards for Multifamily Buildings.
    1. Single Family structures reference ANSI/AARST Standard SGM-SF-2017, Soil Gas Mitigation Standards for Existing Homes.

For new construction:

    1. Multifamily structures reference ANSI-AARST CC-1000-2018, Soil Gas Control Systems in New Construction of Buildings or ANSI-ASHRAE 189.1-2017, Standard for the Design of HighPerformance Green Buildings except Low Rise Residential Buildings, Sections 801.3.4, 1001.3.1.9, and 1001.3.2.1.4.5.d.
    1. Single Family structures reference ANSI-AARST CCAH-2020, Reducing Radon in New Construction of 1 & 2 Family Dwellings and Townhouses.

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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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