IAPMO Publishes Peak Water Demand Study

IAPMO has released Peak Water Demand Study: Full Study, a comprehensive analysis redefining water supply system sizing for residential and multi-family buildings. Based on real-world data from more than 1,000 households, the full study provides an evidence-based approach to right-sizing plumbing systems — demonstrating reductions in water waste, construction costs and public health risks.

Key parts of the study include:
• Results and recommendations for the end use of fixture and appliance flow rates.
• Description of the fixture use probabilities that were observed as part of a more than 1,000-home data set.
• Explanation of the algorithms used in calculating peak flow rates as part of the Water Demand Calculator.

IAPMO encourages plumbing professionals, regulators and builders to adopt these findings. The study supports the expanded use of the Water Demand Calculator, already implemented in multiple states and jurisdictions. Access the full study here.