The project by the Brihanmumbai Municipal Corporation is set to come up on 12 hectares of land at Manori village. The proposed plant will be equipped to supply 200 million litres of water.

…the supply of water is a trickle at 3,800 MLD as against the daily demand of 4,200 MLD. The civic body, Brihanmumbai Municipal Corporation (BMC), has turned futuristic and proposed to set up a desalination plant to transform the natural saline water from the Arabian Sea to quench the thirst of Mumbai residents.

(Source)