Water use is measured in water volume consumed (evaporated) and/or polluted per unit of time.
A water footprint can be calculated for any well-defined group of consumers (e.g. an individual, family, village, city, province, state or nation) or producers (e.g. a public organization, private enterprise or economic sector).
The water footprint is a geographically explicit indicator, not only showing volumes of water use and pollution, but also the locations Wikipedia