Mumbai's water reservoirs have registered an increase in storage levels as monsoon rainfall gathered momentum across the city and surrounding catchment areas. According to data released by the Brihanmumbai Municipal Corporation (BMC), the combined water stock in the 7 lakes supplying water to Mumbai increased from 6.75% to 7.18% on July 1, 2026.
The improvement follows a period of declining reservoir levels during June due to delayed monsoon rainfall. Recent heavy showers have helped boost inflows and eased concerns regarding water availability in the city.
Mumbai receives its drinking water from 7 reservoirs: Upper Vaitarna, Middle Vaitarna, Bhatsa, Tansa, Tulsi, Modak Sagar and Vihar. Reservoir storage levels had been under pressure through much of June as rainfall remained below expectations.
However, with monsoon activity strengthening, water levels have started to recover across several lakes. The combined water stock increased to 1,03,871 million litres from 97,666 million litres recorded a day earlier, indicating a positive trend in reservoir replenishment.
Several reservoirs recorded notable improvements in storage during the latest reporting period. Modak Sagar's storage level increased from 18% to 20%, while Tansa rose to 2.72% after being nearly empty a day earlier.
Middle Vaitarna reached 11.71% of its total storage capacity of 1,93,530 million litres. Vihar crossed the 50% storage mark, and Tulsi's water stock increased to around 28%, although Bhatsa remained below 5% and Upper Vaitarna continued to report negligible storage.
The increase in water stock coincided with widespread rainfall across Mumbai during the previous 24 hours. According to BMC data, Byculla recorded the highest rainfall within the city limits.
Mankhurd registered the highest rainfall among eastern suburbs, while the Bandra-Kurla Complex (BKC) reported the highest rainfall in the western suburbs. The sustained rainfall has improved inflows into the reservoir system and contributed to the rise in overall lake storage.
The India Meteorological Department (IMD) has forecast heavy to very heavy rainfall in Mumbai until July 4, 2026. An orange alert has been issued for the city, with isolated locations expected to receive extremely heavy rainfall on July 3, 2026.
The IMD has also forecast widespread rainfall across Madhya Maharashtra from July 1, 2026, to July 6, 2026, with very heavy rainfall likely in ghat regions on July 2, 2026, and July 3, 2026. Marathwada is also expected to receive widespread rainfall during July 2, 2026, and July 3, 2026.
Read More: Monsoon Hits Maharashtra 10 Days Early.
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The recent spell of monsoon rainfall has provided a welcome boost to Mumbai's reservoir levels after a weak start to the season. Water storage across the city's 7 reservoirs increased to 7.18%, supported by improved inflows into key lakes such as Modak Sagar, Tansa and Middle Vaitarna.
While overall storage remains significantly below full capacity, the increase has helped improve the water supply outlook. Continued rainfall forecast by the IMD is expected to remain a key factor influencing reservoir replenishment in the coming days.
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Published on: Jul 1, 2026, 4:50 PM IST
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