![]() Within building types, such as office and nonrefrigerated warehouse, the usage per square foot is about the same for the different age groups evaluated. ![]() Large buildings constructed before 1960, between 19, and between 20 all used about 20 gallons per square foot in 2012. Water use per square foot in large buildings does not vary significantly by the age of the building, with the exception of inpatient healthcare buildings. Warehouse and storage buildings used only 3.4 gallons per square foot, making them the least water intensive of the large buildings. Public order and safety buildings (which include prisons) and lodging buildings (which includes hotels) were the next most intensive, each averaging about 42 gallons per square foot. Inpatient healthcare buildings were the most intensive users of water in 2012, averaging almost 50 gallons per square foot per year. The types of buildings that are the most intensive water users are open around the clock and have activities within them that use large amounts of water.
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