2020 Water Efficiency and Sanitation Standard Published as American National Standard

The International Association of Plumbing and Mechanical Officials has published the 2020 Water Efficiency and Sanitation Standard as an American National Standard. Developed by IAPMO and first published in 2017, WE•Stand focuses on achieving safe and efficient water use in residential and non-residential buildings. It is available for purchase at

The 2020 WE•Stand joins the 2021 editions of the Uniform Plumbing Code, Uniform Mechanical Code, the Uniform Solar, Hydronics and Geothermal Code and the Uniform Swimming Pool, Spa and Hot Tub Code as American National Standards. The UPC and UMC have continuously earned the designation since 2003; the USHGC — originally known as the Uniform Solar Energy Code— and the USPSHTC have held the distinction since 2009.

Key provisions of the standard include:

  • Water efficiency and conservation requirements
  • IAPMO Water Demand Calculator
  • Alternate water sources for nonpotable applications, such as gray water systems, reclaimed (recycled) water systems and onsite treated nonpotable water systems
  • Potable and nonpotable rainwater catchment systems
  • Water heating design
  • Non-sewered sanitation systems
  • Recirculating shower systems
  • Leak detection and control
  • Composting toilet and urine diversion systems
  • Onsite blackwater treatment systems
  • Onsite stormwater treatment systems
  • Vacuum drainage systems
  • References to industry standards addressing water treatment technologies

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