Water consumption * Activity that accounts for more than half of all water consumed for all purposes in the United States: livestock production (26) Water consumption In California, the number of gallons needed to produce 1 edible pound of: (*27) Tomatoes 23 Lettuce 23 Potatoes 24 Wheat 25 Carrots 33 Apples 49 Oranges 65 Grapes 70 Milk 130 Eggs 544 Chicken 815 Pork 1630 Beef 5214 * How long it takes a person to use 5200 gallons of water showering (at 5 showers per week, 5 minutes per shower, with a flow rate of 4 gallons per minute) : One year (One gallon: British=imperial 4,54 L. US 3,79 L) home.iae.nl/users/lightnet/health/Earth/Earth.htm