Looks like they're already on top of it:
$1:
Nation's largest ocean desalination plant goes up near San Diego; Future of the California coast?
The crews are building what boosters say represents California's best hope for a drought-proof water supply: the largest ocean desalination plant in the Western Hemisphere. The $1 billion project will provide 50 million gallons of drinking water a day for San Diego County when it opens in 2016.
Fifteen desalination projects are proposed along the coast from Los Angeles to San Francisco Bay.
Desalinated water typically costs about $2,000 an acre foot -- roughly the amount of water a family of five uses in a year. The cost is about double that of water obtained from building a new reservoir or recycling wastewater, according to a 2013 study from the state Department of Water Resources.
Sometimes the high costs can turn off the spigot.
After enduring severe water shortages during a drought in the late 1980s, Santa Barbara voters agreed to spend $34 million to build a desalination plant. It opened in 1991 and provided water for four months. When the drought ended, the city shut it down. Water from reservoirs and other sources was significantly cheaper.
Similarly, Australia spent more than $10 billion building six huge seawater desalination plants during a severe drought from 1997 to 2009. Today, Cooley noted, four are shut down because when rains finally came, the cost of the water became noncompetitive.
"We run the risk of building facilities that we don't use," Cooley said. "And that's a waste of money."
http://www.mercurynews.com/science/ci_2 ... es-up-near