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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.
When the desalination plant comes online in 2016, it will produce 50 million gallons per day, enough to offset just 7 percent of the countyâs water usage. Thatâs a huge bill for not very much additional water. Advertisement. Desalination is not a new technology, but itâs still expensive. Despite the cost, its uptake is growing as dry places look to secure drought-proof sources of water.