The International Association of Plumbing and Mechanical Officials (IAPMO) has made available a Water Demand Calculator (WDC) that estimates peak water demand in residential buildings. The WDC will appear in the appendices of both the 2018 Uniform Plumbing Code® (UPC) and the 2017 Water Efficiency and Sanitation Standard (WE•Stand), both of which are American National Standards. IAPMO initiated a MOU with the ASPE to form a special task force to revise the methodology for properly estimating premise-plumbing water supply demands in response to the increased use of water-conserving plumbing fixtures, fixture fittings and appliances, and the subsequent decreased demand for water in single- and multi-family residences.


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