Ontario, California — IAPMO®, a global team of experts engaging industry and government for a safer built environment, is proud to announce that its Water Demand Calculator® has been featured as a key recommendation in the Pacific Institute’s new landmark report, “Untapped Potential: An Assessment of Municipal and Industrial Water Efficiency Potential in the United States.”
The first-of-its-kind national assessment finds that improving water efficiency could reduce municipal and industrial water use across the United States by 25-60%, saving billions of gallons each day and significantly lowering infrastructure and energy costs. The Pacific Institute specifically recommends the adoption of IAPMO’s Water Demand Calculator as an essential tool to achieve these savings by right-sizing plumbing systems to reduce structural water waste, lower construction costs, and improve water quality.
The report asserts: “States and municipalities should amend their plumbing codes to require IAPMO’s Water Demand Calculator for estimating peak demand and provide training on its use for inspectors, installers, and design professionals.”
The Pacific Institute is a leading nonpartisan research organization dedicated to advancing water sustainability and resilience through innovative science-based analysis, policy recommendations, and partnerships that promote equitable and efficient water management solutions worldwide.
Christoph Lohr, IAPMO’s vice president of Technical Services and Research, played an integral role in the development of the report as a member of its Advisory Group. His research and several IAPMO publications are cited throughout the study, underscoring the organization’s leadership in advancing practical, evidence-based water efficiency solutions.
“It’s an honor to see the Pacific Institute recognize the transformative potential of the Water Demand Calculator,” Lohr said. “By rethinking how we size plumbing systems, we’re not only saving water but also cutting construction costs, improving energy efficiency, and enhancing public health through better water quality. This report reinforces what we at IAPMO have long believed — smart plumbing design is foundational to sustainable water management.”
Developed by IAPMO through years of technical research and collaboration with industry partners, the Water Demand Calculator enables designers and engineers to more accurately estimate peak water demand in residential and multifamily buildings. By aligning plumbing system design with actual water use patterns rather than outdated assumptions, the tool helps reduce pipe sizing, minimize stagnation, and improve system efficiency and performance.
Read more about the Water Demand Calculator.
The Pacific Institute’s Untapped Potential report serves as a powerful call to action for policymakers, utilities, and industry professionals to adopt proven, cost-effective technologies like the Water Demand Calculator to help strengthen the nation’s water resilience. Among its key findings are:
“By reducing leaks and adopting proven technologies and practices, we can save tens of millions of acre-feet of water each year — enough to dramatically reduce pressure on lakes, rivers, and aquifers while also supporting a vibrant economy and resilient communities,” said Heather Cooley, chief research and program officer at the Pacific Institute. “We’re excited to see this research helping to reframe efficiency as one of the most powerful and practical tools for building a sustainable water future.”
The full report is available online, and the Pacific Institute will host a webinar to discuss its findings on Dec. 4.
ARCSA International will host a new Technical Symposium May 20–21, 2026, at Grundfos Headquarters in Brookshire, Texas. This two-day event will feature advanced training, industry updates, technology displays, and networking opportunities, with full program details coming later this year.
IAPMO® is proud to be a diamond sponsor and administrating organization at the 2025 ANSI Innovation Summit this week. Formerly World Standards Week, the ANSI Innovation Summit is an annual event that convenes the Institute's members and private- and public-sector stakeholders from across the standards and conformity assessment communities to come together, learn from each other, and showcase their important work.
IAPMO®, a global team of experts engaging industry and government for a safer built environment, and its charitable foundation, the International Water, Sanitation and Hygiene Foundation (IWSH®), are proud to celebrate 10 years as a WorldSkills Global Industry Partner. IAPMO and IWSH celebrated the milestone this week at the annual General Assembly of WorldSkills International Members in Dubrovnik, Croatia.