Water in Food Production

The water footprint of food depends on diet, location, and production methods. A systematic review found a wide range of estimates for diets—about 688–8,341 litres per person per day—so “more than 6,800 gallons” (about 25,700 litres) for a family of four is not a universal figure without specifying the diet and method. A water footprint may include rainwater (green) and surface or groundwater (blue) consumed in production.