Water your lawn only when it needs it. Step on your grass. If it springs back, when you lift your foot, it doesn't need water. So set your sprinklers for more days in between watering. Saves 750-1,500 gallons per month. Better yet, especially in times of drought, water with a hose. And best of all, convert your lawn to native plants.
Fix leaky faucets and plumbing joints. Saves 20 gallons per day for every leak stopped.
Don't run the hose while washing your car. Use a bucket of water and a quick hose rinse at the end. Saves 150 gallons each time. For a two-car family that's up to 1,200 gallons a month.
Install water-saving shower heads or flow restrictors. Saves 500 to 800 gallons per month.
Run only full loads in the washing machine and dishwasher. Saves 300 to 800 gallons per month.