A small leak wastes 15 gallons per day. Lawns and shrubs should be watered thoroughly once or twice a week as opposed to shallow waterings every day. Shallow watering promotes a shallow root system, which causes the plant to suffer during dry conditions. Soaker hoses are better for watering shrubs, since they can be placed at the base of the plant to thoroughly water the root system. Don t use a sprinkler to water on windy days.
Wind often blows the water onto streets or sidewalks, and evaporation is greater on windy days.
Use a timer on the sprinkler. Inexpensive timers are available for use on hose sprinkler systems. If you have an inground irrigation system which uses an automatic timer, install a moisture sensor which will keep the sprinkler from operating when it is raining or otherwise not needed. Don t use the hose to sweep the driveway or sidewalk. A broom or blower works just as well and doesn t waste water.