After 15 minutes, check for color in the toilet bowl. If you see any color, your toilet has a leak and should be repaired immediately. Low-flow faucet aerators use no more than 2.5 gallons of water per minute. The aerators can be screwed into your existing faucets. Small faucet leaks can waste 20 gallons of water a day.
Large leaks can waste hundreds of gallons.
Don't let the water run when you brush your teeth, wash your face or hands, or shave. This can save 3 to 7 gallons per minute. Make sure they are fully loaded. Try to reduce the rinsing you do before loading the dishwasher because it is not always necessary. When buying dishwashers or washing machines, select high efficiency models that use less water and energy.