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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.
Costs vary, but the lowest price for desalinated seawater from a reverse osmosis plant is around $750 an acre-In the U.S., water-strapped California leads in both water innovations and needs. foot (325, 851 gallons) â more than double the average cost of groundwater.owever, desalination is expensive, energy-intensive, and can damage marine ecosystems. Moreover, while seawater accounts for 60 percent of desalinated water today, Sedlak and others say itâs much more practical and sustainable to desalinate less-salty brackish water and use the technology to recycle wastewater.