Aim low: It’s the roots of the plants that need the water most. Drip irrigation systems are great for trees and shrubs because they reduce evaporation and send water right to the roots. Each drip emitter usually releases about ½ to 2 gallons hourly.
Is your water bill high in summer? Consider reducing your lawn size. Areas of lawn that you don't use often could be converted to water-efficient landscaping that uses native or drought-tolerant plants, mulch, and pavers or rock features.