The WEStand is developed by IAPMO to provide comprehensive requirements for optimizing water use practices attributed to the built environment while maintaining protection of the public health, safety and welfare. The 2023 WEStand embodies the latest advancements in water conservation practices within the built environment.
Key provisions of the 2023 WEStand and changes from the 2020 edition include:
- New permitting requirements addressing applications; construction documents; exempt work; inspections and testing; violations and penalties; and appeals
- New requirements for alternative engineered designs
- New requirements for identification of potable and nonpotable water systems
- Updated maximum flow rates for fixture fittings
- New listing requirements for water treatment systems
- New water meter performance specifications
- Updated requirements for landscape design and installation including documentation; plant and irrigation system limitations; irrigation control systems; zone performance criteria; audits; and sprinklers
- Updated requirements and examples for the Water Demand Calculator
- Updated ecological-sanitation system provisions addressing operation and maintenance manuals; sizing of urine storage tanks; and treatment and application of stored urine
- New Chapter 9 for the design, installation, construction, and maintenance of onsite gray water treatment systems for non-potable reuse
- New requirements for determining the maximum hot water system ratio in dwelling units
- Updated requirements for potable rainwater catchment systems addressing minimum water quality; maintenance and testing; collection surfaces; and drainage materials
- New Appendix E for the design and installation of onsite wastewater treatment systems for direct potable water use in dwelling units
- New Appendix F for the design and installation of gray water drainage systems in new construction, additions, and retrofits to allow for future connections to gray water irrigation or reuse systems
- New Appendix G for water efficiency ratings applicable to residential properties containing single-family dwellings
The 2023 WEStand represents the second edition to be developed via the ANSI-accredited consensus process.
