Radon-Reporter-2026-Issue-1FINAL

THE RADON REPORTER | 27 STANDARDS Vapor Intrusion Standards New Projects under Development The Consortium is preparing for a significant expansion of VI standards development work. While the VI Chair has not yet been seated and formal drafting has not begun, the Executive Standards Committee (ESC) has approved moving forward with two new ANSI/AARST standard project proposals that will form the foundation of the Association’s first dedicated VI standards. These early steps signal the beginning of a coordinated effort to build consensus standards addressing vapor intrusion investigation and decision-making. The first project, VI-MA , focuses on vapor intrusion measurement and sampling of indoor air and sub-slab soil gas. The previously filed Project Initiation Notification System (PINS) BSR/AARST VI-MA-202x (VIMA) has received a revised scope that establishes minimum requirements and guidance for measurement and sampling practices, explicitly linking these activities to conceptual site model (CSM) procedures used to evaluate potential human health and environmental risks. The newly proposed second project, VI-CSM, establishes a uniform conceptual site model framework for vapor intrusion sites. Its draft scope emphasizes clarity and consistency in guiding recommended and required actions associated with addressing vapor intrusion health concerns. Together, these two projects complement the soil gas mitigation standards and set the stage for the Consortium’s additional VI standards work that will begin once the VI Chair is seated, the necessary consensus seats are created, and the right experts are seated to carry these consensus-based standards forward. Oversight for Consumer Radon Monitors The Quality Assurance (QA) Standards Committee is evaluatingwhether to develop standardized oversight for consumer digital radon monitors (CDRMs) , an area of growing interest as more homeowners and real-estate professionals rely on consumer-grade devices. This could be considered to supplement the CRCPD E-25 guidance released late last year. With the rapid expansion of consumer radon technology, establishing consistent expectations for accuracy, performance, and quality control is becoming increasingly important. ANSI/AARSTWater Standard Revisions out for Public Review Protocol for the Collection, Transfer and Measurement of Radon in Water 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 25, 2026