Run full loads in your dishwasher and save energy, and don't pre-rinse your dishes before putting them in. Do both and you'll save up to 20 gallons of water per dish load, or 7,300 gallons over a year. That's as much water as the average person drinks in a lifetime. (If you must handwash, turn off the tap while you scrub.)

Fact taken from: "The Green Book", by Elizabeth Rogers and Thomas M. Kostigen