The continuation of the Water Demand Calculator® Summit is an opportunity for plumbing industry professionals to learn how IAPMO has set the bar in right-sizing of plumbing systems, which is part of two American National Standards: the Uniform Plumbing Code (UPC®) and the Water Efficiency and Sanitation Standard (WE•Stand). IAPMO, along with industry partners the University of Cincinnati and the American Society of Plumbing Engineers, was ‘first up’ to the challenge of creating a new water sizing standard approved under the ANSI-accredited development process as Appendix M in the UPC and Appendix C in the WE•Stand, and this summit will showcase how that work continues to evolve.