ANSI/AARST MAH-2023 (PDF)Protocol for Conducting Measurements of Radon and Radon Decay Products in Homes 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. Updates for 2023: Improvements continue with improved clarity for:
- Planning tests that include testing multiple locations in a home
- Test duration’s when closed-building conditions did not begin 12 hours before the test
- How to handle test results that disagree
- Professional requirements for qualification, onsite documentation, and reporting.