The Brihanmumbai Municipal Corporation (BMC) has decided to construct a Rs 3,038-crore tertiary-treated  water tunnel between Dharavi sewage treatment plant  and Ghatkopar. This 8.48-km-long tunnel, with a diameter of 2.7 metres, will transport treated sewage to the Bhandup water treatment plant. The tunnel will be dug 145 to 150 metres underground.

BMC plans to use this tunnel to transfer tertiary-treated water from Ghatkopar to the Bhandup Complex. A separate Rs 3,216-crore proposal has been approved for an 11.61-km tunnel with a 3.3-metre diameter for the same purpose.