ANSI/AARST MAH
Protocol for the Collection, Transfer and Measurement of Radon in Water
The proposed revision to the ANSI/AARST "Radon in Water Measurement" is out for public comment. Comments are due May 25,2026.
The proposed revisions for publication include various changes in redline/cross-out style that are mostly for clarity as reviewed by the current consensus body. A new Section 3 and revisions to 5.3 and 5.4 were previously publicly reviewed.
This standard of practice contains minimum requirements and guidance for measuring radon in water that enters a building through groundwater supplies for determining if mitigation is necessary to protect current and future occupants of dwellings and other buildings. This standard includes procedures for the collection and transport of water samples, as well as protocols for the quantitative transfer of the sample to a measurement device to determine radon concentrations in water.
Deadline for comments: May 25th, 2026
Access to public review content:
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Standards Update Notices? A tool is available now for folks who might not participate in all AARST broadcast news but desire to be sent notifications about public reviews and newly published standards. One can sign up for such an option at https://aarst.org/radon-news-preferences/
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