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National Consensus Standards for Every Building Type

The impact of occupant exposure to radon in buildings is an important public protection issue that requires standardized approaches to measurement and mitigation, and long-term stewardship to confirm concentrations in buildings remain below the EPA Action Level. Whether the source of radon is through soil or water, or by emanation from building materials, preventing radon exposure to building occupants is one of the most important environmental health challenges we face today.


EPA Recommends States Reference ANSI/AARST Radon Standards

The U.S. Environmental Protection Agency (EPA) has been actively participating in the radon industry-led ANSI/AARST voluntary consensus-based standards (VCS) process since 2012.  Federal participation in the development and use of VCS is governed by the National Technology Transfer and Advancement Act (1995), and Circular A-119 (2016, 1998) issued by the Office of Management and Budget, Executive Office of the President. For more information, please visit “EPA Guidance on the Use of Voluntary Consensus Standards for State Indoor Radon Grant Recipients.”


The AARST Consortium on National Radon Standards

The AARST Consortium on National Radon Standards is a non-profit organization owned by AARST. The consortium serves as the forum for development, maintenance and publication of national consensus standards, which include processes, procedures and quality assurance systems to ensure standardized approaches for measurement and mitigation in both existing and new buildings. Hundreds of volunteer members representing key stakeholder groups, including analytical laboratories, federal and state regulators, radon measurement and mitigation contractors, product manufacturers, training organizations, scientists and academia, and environmental consultants, have developed and continue to maintain standards through participation on multiple committees.


Accreditation by the American National Standards Institute (ANSI)

The consortium is an ANSI-approved standards developer, which means standards are developed and maintained through ANSI’s established consensus process to ensure openness, balance and due process through the following items:

* Open Participation
* Stakeholder Balance
* Standard Development
* Consensus Vote
* Public Comment and Appeals
* Standards Publication
* Standards Maintenance


Current ANSI/AARST National Consensus Standards

ANSI/AARST national consensus standards are utilized by numerous federal and state agencies, such as the Department of Housing and Urban Development (HUD) and the Environmental Protection Agency (EPA). A national consensus standard is available for every building type:

Single-Family Buildings

ANSI/AARST MAH-2019

Protocol for Conducting Measurements of Radon and Radon Decay Products in Homes

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This standard of practice specifies minimum requirements and general guidance for measuring radon concentrations in single-family residences. This standard applies to testing structures whether conducted for real estate or non-real-estate purposes. The purpose of test protocols is to consistently produce, to the extent possible, reliable and repeatable radon measurements. Radon measurements are conducted to determine if radon mitigation is necessary in order to protect current and future occupants.


ANSI/AARST SGM-SF-2017

Soil Gas Mitigation Standards for Existing Homes

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This standard specifies practices, minimum requirements and general guidance for reducing soil gas entry into existing homes in order to mitigate occupant exposures to certain hazardous soil gases, including radon gas, chemical vapors and other hazardous gases. It addresses a wide range of mitigation methods and provides guidance for health and safety, system design, system installation, and ongoing stewardship. Applicable to residences not more than 3 stories above grade those classified as single-family; and those that contain no more than 4 attached dwelling units on a contiguous foundation.

Multifamily Buildings

ANSI/AARST MAMF-2017

Protocol for Conducting Measurements of Radon and Radon Decay Products in Multifamily Buildings

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This standard of practice specifies procedures, minimum requirements and general guidance for measurement of radon and radon decay product concentrations in Multifamily buildings that have more than one attached dwelling. Provided with this document is an “Informational Introduction to Radon” and an “MAMF Companion Guidance” document that includes informational guidance for residence managers.


ANSI/AARST RMS-MF-2018

Radon Mitigation Standards for Multifamily Buildings

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This standard of practice specifies minimum requirements and general guidance for mitigation of radon and soil gas in existing multifamily buildings. The techniques addressed in this standard provide whole-building consideration yet also apply to portions of a building or individual occupied space. Improvements to RMS-MF 2018 include harmonized provisions with ANSI/AARST standards RMS-LB (schools and large buildings), SGM-SF (existing homes) and CC-1000 (new construction).


Schools and Large Buildings

ANSI/AARST MALB-2014

Protocol for Conducting Measurements of Radon and Radon Decay Products In Schools and Large Buildings

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This standard of practice specifies procedures, minimum requirements and general guidance for measurement of radon and radon decay product concentrations in schools and large buildings. This document includes: I.) Informational Introduction to Radon, II.) Informational Guidance for Building Managers; III.) Protocol for Conducting Measurements of Radon and Radon Decay Products in Schools and Large Buildings.

ANSI/AARST RMS-LB-2018

Radon Mitigation Standards for Schools and Large Buildings

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This standard of practice specifies minimum requirements and general guidance for mitigation of radon and soil gas in existing schools and large buildings. The techniques addressed in this standard provide whole-building consideration yet also apply to portions of a building or individual occupied space. Improvements to RMS-LB 2018 include harmonized provisions with ANSI/AARST standards RMS-MF (multifamily), SGM-SF (existing homes) and CC-1000 (new construction).

New Construction

ANSI/AARST CCAH-2013

Reducing Radon in New Construction

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This standard of practice was developed to further radon risk reduction in the U.S. by providing a model building code to achieve indoor radon concentrations of less than 4 pCi/L in new homes. RRNC.2.0 is a “code ready” standard that provides a significant improvement over the IRC Appendix F “Radon Control Methods.” It provides minimum requirements for Rough-In of a Mitigation System and Activation of the Mitigation System, if required, in newly constructed dwelling units.

ANSI/AARST CC-1000-2018

Soil Gas Control Systems in New Construction of Buildings

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This standard provides minimum requirements for the construction of any building intended for human occupancy, except for 1 and 2 family dwellings, in order to reduce occupant exposure to radon and other hazardous soil gases. It addresses the construction of buildings to be utilized for multifamily or congregate residential, educational or commercial occupancies.

Quality Assurance

ANSI/AARST MS-PC-2015

Performance Specifications for Instrumentation Systems Designed to Measure Radon Gas in Air

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This standard specifies minimum performance criteria and testing procedures for instruments designed to quantify the concentration of radon-222 gas in air. These criteria are applicable to the wide variety of devices used for indoor radon measurements, primarily in residential environments or buildings not associated with the possession or handling of radioactive materials. Also included is a description of documentation necessary for compliance with this standard.

ANSI/AARST MS-QA-2019

Radon Measurement Systems Quality Assurance

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This standard specifies minimum requirements for quality systems designed to quantify the concentration of radon-222 gas in air by qualified professionals (QPs) and laboratories, whose data are intended to be used to determine the need for, or success of mitigation. It is applicable to the wide variety of radon measurement devices used for indoor measurements, primarily in residential environments or buildings not associated with possession or handling or radioactive materials.