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Rooftop water tanks help deliver drinking water to millions of New York City residents. Based on an inventory of buildings that stand seven stories or taller, it’s estimated that there are 12,000 to 17,000 water towers in New York City. As needed, pumps push water to rooftop tanks where the water is stored until used. When a faucet is turned on within the building, water exits the tank and gravity carries the water to the floors below to be used.
