Water the landscape only, not streets, walks and driveways. Keep grass fairly long - taller grass holds moisture better. This prevents the excessive shock that causes grass to turn yellow. Keep your grass two to three inches long. Let it grow to its full 6 inches like a soft ground cover.
Water is a precious commodity and there is a limited supply.
Remember to use only the amount you actually need. Look for ways to conserve water in and around your home and place of work.