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ANSI/RESNET/ICC 850-2025
Standard Calculation and Labeling of the Water Use Performance of Dwelling and Sleeping Units Using a Water Rating Index
This standard establishes a consistent, uniform methodology for evaluating, quantifying, and labeling the water use performance of one- and two-family dwellings. Using a comparative framework, the standard assesses the water use performance of an actual home against a reference home of identical geometry. The result is a standardized Water Rating Index (WRI), providing a clear, relative measure of water efficiency. A WRI score of 100 indicates that the rated home’s water use performance matches that of the reference home.
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International Code Council [icc]