Mumbai’s sewer network reaches 81% of residents; BMC plans expansion

Nearly 19% of Mumbai’s population remains outside the sewerage network, while existing lines cover 85% of the city’s geographical area and serve 81% of residents.

The Brihanmumbai Municipal Corporation (BMC) is preparing to expand and strengthen the system under the next phase of its Mumbai Sewerage Improvement Programme. It has shortlisted 12 consulting agencies to prepare a detailed project report mapping the work required.

Gaps in access remain in slum settlements, where some residents depend on septic tanks because underground sewer lines are unavailable. The proposed expansion also includes colonies under MHADA, the Airport Authority, Railways and Mumbai Port Authority.

The BMC plans to route wastewater now entering rivers, drains and stormwater channels into the sewer network as part of the work, alongside river-rejuvenation measures. Difficult terrain, uncertain underground conditions, land constraints and statutory clearances have slowed progress, an official said.

The detailed project report is expected to set out the network’s expansion and capacity requirements.