WATER IS A PRECIOUS RESOURCE. IT IS VERY IMPORTANT TO WATER WISELY! You can be "green" and have your grass, too!
Please make sure you choose the variety best suited for you (warm season grasses use less water than cool season grasses), and follow maintenance tips.
Newly planted sod needs to be watered much differently than established lawns. New sod must be watered more frequently for the first three weeks. For established lawns however, only water often enough to avoid wilt between irrigations.
You can download this free publication from the University of California on "Managing Turfgrasses During Drought" here.
Newly Planted Sod
Water four times daily in the summer and two times daily in the winter, during daylight hours. Soak the sod enough to keep the top three inches of soil along with the layer of sod constantly wet, but do not allow water to stand for long periods. When rooting has sufficiently developed(about 14 days) to prevent sod from being pulled from the soil, cut watering to once a day during summer and every other day in the winter. After 21 days water 2 to 3 times a week in the summer and every 3 to 10 days in the winter. The table below detail watering frequency and duration for new sod in summer or winter.
Check with your water district. They are usually allowing more water for new sod for 30 days to establish your lawn.
Here are some helpful links to give you even more tips on how to be water wise with your lawn.