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As usual this is a government caused problem.

Desalination -- the removal of salt from salt water -- would be the ultimate solution to water woes -- if it can be done cheaply enough. That's a big if: "The best estimates are $2 to $2.50 per ton for desalination," says de Villiers. "That not really that far from the real cost of delivering water from the Colorado River, but California's water is so heavily subsidized that they are paying 10 cents per ton when the real cost is closer to $2.50 per ton."
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Water subsidies are a fact of life in the western United States. According to de Villiers, they amount to $500 per acre. He alleges that "70 percent of the farmers' profits in California's Central Valley -- which is supposed to be the richest farmland in the world -- came directly through taxpayer subsidization."

http://waterindustry.org/Water-Facts/water-costs-8.htm

If mass fresh water is needed it might be cheaper to simply spray offshore ocean water into the air during midday and let mother nature separate the fresh water out and air lift the water in. The resulting clouds would cool the climate lowering air-conditioning and wildfire costs. If wanted Southern California could be turned into a rain forest. But leftists would change from global warming to complaining about man-made clouds.