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But desalination is expensive. A thousand gallons of freshwater from a desalination plant costs the average US consumer $2.50 to $5, Pankratz says, compared to $2 for conventional freshwater.ut desalination is expensive. A thousand gallons of freshwater from a desalination plant costs the average US consumer $2.50 to $5, Pankratz says, compared to $2 for conventional freshwater.
Another large plant, with a potential price tag of $400 million, could begin construction in Monterey County by 2018. It would be near the only desalination plant in California that fills the needs of an entire municipality-the one that has been supplying water to Sand City, population 334, since 2010.