If you use an automatic sprinkler system, consider installing a weather-based control device.
Weather-based controllers adjust watering times for warmer temperatures, and completely shut off the system when it rains.
According to the EPA, these smart irrigation controllers can reduce outdoor water use by 20 percent-saving the average household up to 15,000 gallons of water per year.
If every automatic residential irrigation system in the U.S. were equipped with a rain shutoff device, the total annual savings could be 24 billion gallons-equivalent to more than 7,000 hoses running non-stop for a whole year.
Sources:
Environmental Protection Agency