New York City uses an average of 1.1 billion gallons (4.2 billion liters) of water a day. That is about 35% below a 1979 peak. The city attributes the decrease to such factors as improvements in spotting leaks.
https://www.thehindu.com/news/international/nyc-declares-a-drought-watch-and-asks-residents-to-conserve-water/article68823876.ece
