London Mayor Ken Livingstone submitted an appeal to the UK High Court against Thames Water Utilities' proposed desalination plant in Becton, in the east of the capital.
Livingstone is appealing last month's approval to build the facility, saying the government didn't give "proper consideration to the Mayor's case" and hasn't properly examined alternatives to the plant, the mayor's press office said in an e-mailed statement today.
"Thames Water should be fixing more leaks rather than finding expensive ways to spend Londoners' money on making fresh water," Livingstone said in the statement.
"Adding 200 million pounds to Londoners' water bills to spend on technology more appropriate for the desert is simply a disgrace. I cannot sit back and allow this to happen."