Estimates of water consumption in large (greater than 200,000 square feet) commercial buildings from the 2012 CBECS are now available in this report: Water Consumption in Large Buildings Summary. Included in the report are annual water consumption estimates (Table W1) and daily estimates (Table WD1). Additionally, a public use microdata file is available for users to perform custom analysis. For information on how the data were collected, see How was water usage information collected for commercial buildings?
“U.S. Energy Information Administration”