A concerning decline in Mumbai’s drinking water reserves has been reported as delayed monsoon activity continues to affect the city’s key water sources. According to data released by the Hydraulic Engineer’s Department on June 21, 2026, only a small fraction of the required water stock has been accumulated across the seven lakes that supply potable water to the financial capital.
It was revealed that a combined water stock of 1,44,736 million litres was available in the reservoirs as of Sunday morning. This quantity was reported to represent only 8.68 per cent of the total storage capacity required to meet the city’s annual water demand. The figures have highlighted growing concerns over the pace of water accumulation during the current monsoon season.
Water for Mumbai is supplied from a network of reservoirs comprising Upper Vaitarna, Modak Sagar, Tansa, Middle Vaitarna, Bhatsa, Vihar and Tulsi lakes. However, replenishment of these reservoirs has been significantly slowed due to weak rainfall activity across the catchment regions. As a result, reservoir levels have remained well below expected seasonal averages.
Among the major water sources, Bhatsa Lake was reported to be holding the highest volume of usable water. A storage level of 57,288 million litres was recorded in the reservoir, although this represented only a small proportion of its overall capacity. Middle Vaitarna and Modak Sagar were also reported to contain limited reserves. Meanwhile, Upper Vaitarna was found to have no usable water remaining after its level dropped below the lower drawable limit, preventing further extraction.
The situation was further compounded by the lack of rainfall recorded across most catchment areas during the previous 24 hours. Negligible precipitation was reported from Modak Sagar and Middle Vaitarna, while no significant rainfall activity was registered at Bhatsa, Vihar and Tulsi. At the Bhandup Complex, which serves as the city’s master water control centre, only 1 mm of rainfall was recorded.
A sharp contrast was observed when current storage figures were compared with those recorded during the same period last year. In June 2025, water reserves had exceeded 3.74 lakh million litres, accounting for nearly 26 per cent of total storage capacity. The substantial decline recorded this year has been largely attributed to the late arrival and slow progress of the southwest monsoon across Maharashtra.
Concerns regarding Mumbai’s water security have consequently been intensified. Several precautionary water cuts have already been announced, while reservoir levels continue to be monitored by civic authorities. It was also noted that water releases from Middle Vaitarna had commenced in November 2025, while releases from Upper Vaitarna were halted on June 20 after the lake level fell below the drawable threshold.
Hope is now being placed on sustained and widespread rainfall across the catchment regions over the coming days. Until significant precipitation is received, concerns over future water availability and supply management are expected to remain at the forefront of civic planning and public attention.