Mumbai’s long-term water security strategy is entering a critical phase as two major supply projects move closer to execution, with civic authorities projecting a substantial increase in daily water availability by 2029. The planned additions come at a time when the city is grappling with rising demand, distribution losses and increasing pressure from population growth, redevelopment and climate uncertainty. According to municipal projections, the combined completion of a new reservoir project in the Mumbai Metropolitan Region and a large-scale seawater treatment facility along the city’s western coast could add 640 million litres of water per day to the network. The development is expected to play a significant role in narrowing the gap between supply and future demand in one of India’s fastest-growing urban economies.
The proposed Mumbai water supply expansion includes two distinct approaches to water security. One project seeks to increase freshwater storage capacity through a new dam system, while the other aims to diversify sources by converting seawater into potable water through desalination technology. Urban planners view the dual approach as an acknowledgement that future water resilience cannot depend solely on monsoon-fed reservoirs. Current estimates indicate that Mumbai requires significantly more water than it is able to deliver daily. While reservoir systems provide the bulk of the city’s drinking water, experts point out that supply challenges are not limited to source generation alone. Ageing pipelines, leakages, unauthorised connections and transmission losses continue to reduce the efficiency of the existing network, resulting in substantial quantities of treated water failing to reach end users. Senior civic officials have indicated that regulatory clearances for the reservoir project are in the final stages, with construction expected to begin once environmental approvals are secured.
Both projects are targeted for completion before the 2029 monsoon season, aligning with broader efforts to strengthen urban infrastructure ahead of projected population growth. The Mumbai water supply expansion also raises wider questions about balancing infrastructure development with environmental stewardship. Water experts note that large reservoir projects often require careful management of ecological impacts, land acquisition and community rehabilitation. Similarly, desalination facilities, while offering climate-resilient water sources, must address concerns related to energy consumption and marine ecosystem management. Discussions within civic decision-making bodies have also focused on how major water infrastructure projects are planned and delivered. Policymakers have debated the role of external technical consultants, with some advocating stronger utilisation of institutional expertise available within municipal systems to improve long-term capacity building.
With water demand expected to rise sharply over the next two decades, Mumbai’s ability to secure reliable and equitable access to drinking water will increasingly depend on both new infrastructure and improvements to existing distribution systems. Urban experts argue that future success will be measured not only by how much additional water is generated, but also by how efficiently and sustainably it reaches households, businesses and public services across the city.
