The simple solution is this... Kill Your Lawn!
Replacing your lawn with California natives or natives from where ever you are from, will save you lots of money and water.
The video will explain further. All info below was taken from the kcet website.
"Southern California has long had a rocky relationship with water: To stay alive in this semi-arid piece of the planet, Angelenos have stolen it, plundered it and wasted it for nearly a hundred years now.
We've thrived off that wasted water, but now it's time to get serious. We're smack in the middle of the worst drought in thirty years and Southern Californians are fighting back. In Long Beach, citizens have gone on neighborhood watch, taking to the streets with cameras and posting videos of overindulgent sprinklers and water-wasting neighbors on YouTube. They're replacing those green lawns with drought-tolerant plants and keeping an eye on their watering habits."