It might vary but I think once a week in the winter and twice a week in the summer. Check your water district rules.
Due to the warmer days in the winter the grass is still growing. Not like further North. You need about 3/4 of an inch of water a week. I keep my system off until I need to water. Do the same in the summer. Cuts way down on the water and my grass is ok. I also fertilize, fungicides etc on a regular schedule. When the grass starts turning brown your roots should still be ok and the grass should come back. Try and avoid the grass going brown.
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