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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.
So, what is holding us back from diving in headfirst? Until recently, purifying seawater cost roughly five to 10 times as much as drawing freshwater from more traditional sources [source: USGS ]. RO filters have come a long way, however, and desalination today costs only half of what it did 10 to 15 years ago.nergy consumption accounts for as much as one-third of the total cost of desalinated water, making even coastal plants expensive to operate [source: Maloni, NRC-WSTB ].