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At present, for water electrolyser in desalted seawater or acid solutions, expensive Au- or Pt-coated Ti are required for structural components.

The desalted water makes up about 60% of its total supply and nearly all of its household water, according to 2019 data from the country’s planning and statistics authority.

The process does create some residual contaminants, but it’s less than that of desalted seawater and can be disposed of in septic tanks.

Questions of how and when to offset that environmental harm remain unresolved in regulators’ ongoing review of Poseidon Water’s plans to build a $1-billion desalting plant on the Orange County coastline.

At roughly $2,250 an acre-foot, including distribution, the desalted ocean water would be roughly twice as costly as treated imported supplies from the Metropolitan Water District of Southern California.