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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.
Reverse Osmosis Desalination Costs Analysis. Producing drinking water from Seawater became an affordable solution when no reliable source of fresh water is available. The investment costs far from being the most important consideration. Indeed, chemical and electrical consumptions are the driving operating costs.