Check each faucet in your home for leaks; a slow drip can waste several gallons per day.
To help conserve water pressure and temperature, run the washing machine and dishwasher in the evening.
To see if your toilet is leaking, remove the tank lid and add food coloring to the water in the tank. Check the bowl in 15 minutes and see if the water is colored. If so, the flapper valve may be leaking.
Set your water heater to 120°F for optimum performance.