How Much Water Does a Dishwasher Use?

Older dishwashers tend to use more water per load as they are not as energy efficient as newer models. When using an older dishwasher, a family of four can use 1,800 gallons of water per year. The average family washes around 150 loads of dishes in a dishwasher annually. By using a newer, energy efficient machine, a family of four can save between 500 and 1,000 gallons of water yearly. The exact amounts varies depending on the amount of usage.