Don't let it run. Turn off the tap while brushing your teeth or shaving, or between dishes when washing them.
Check your toilet for leaks. Put a few drops of food coloring in your toilet tank. If the coloring appears in the toilet bowl without flushing, you have a wasteful leak that should be repaired at once.
Wash efficiently. Take shorter showers and only run full loads in the dishwasher or clothes washer.
Install low-flow fixtures. Low-flow shower heads, faucets, and toilets can dramatically lower your water usage.
Water wisely and less frequently. Choose native plants and grasses that require less supplemental water. If necessary, water your lawn and/or plants early in the morning. Watering in the heat of the day can cause more water to evaporate. Position sprinklers so water doesn’t land on paved areas and run off into storm drains.
Capture and reuse rainwater. Use a rain barrel to catch rainwater from your gutters.
Reduce landscape irrigation. Or, better yet, replace the non-native grasses and shrubs with native, drought-tolerant species.