2,500 -- the "water footprint" of the US, in cubic meters per capita, according to Waterfootprint.org.
660,430 -- the equivalent in US gallons per person per year. Compare that to 700 cubic meters per year per capita (184,920 gallons) in China and 1150 cubic meters per year per capita (303,798 gallons) in Japan.
According to the site, "The water footprint of a nation shows the total volume of water that is used to produce the goods and services consumed by the inhabitants of the nation. Since not all goods consumed in one particular country are produced in that country, the water footprint consists of two parts: use of domestic water resources and use of water outside the borders of the country. The water footprint includes both the water withdrawn from surface and groundwater and the use of soil water (in agricultural production)." ::Water Footprint