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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.
The plant cost $21.1 million and has a capacity of 7.5 million gallons per day. It is the city's first drought-proof source of water. By 2004, there were more than 100 desalination plants in Texas, all of them treating either brackish groundwater or surface water.