If curious you can read about our desalinization facilities on the state water board website, here:
gispublic.waterboards.ca.gov
Because much of our coastline is tied up in either protected commercial and military lanes, or adjacent to protected marine life districts, we tend not to have giant, hulking facilities such as you see in places like Mauritania or Saudi Arabia, but they do supply many of our smaller water districts on the coast. The largest, which is in Carlsbad, opened about a decade ago and is still regarded as one of the most cutting edge, energy efficent plants in the world. Despite that, it has been extremely controversial, both because of environmental concerns, and because running it still costs more than importing water into the same water district. It's a sacrifice of greater cost in favor of long term sustainability, and a sizeable minority of voters feel pretty miffed about their concerns being overruled in that regard.
Desal may be about to become a major topic of interest to our member Tswizzle, as there's been a proposal to build a new deep sea facility just a few miles off the coast of Santa Monica, CA, near his adoptive home.
Small note: no Californian ever talks about "Cali" doing anything. Aside from turncoat Republican types, we all love the place that we live, and prefer to say its name in full if we're going to say it at all.