Mumbai's Water Supply Achieves 99.13% Capacity After Recent Heavy Rains In September 2025

Heavy rains in late September have filled Mumbai's seven lakes almost to capacity. The water stock has reached 14.34 lakh million litres (ML), which is 99.13% of their total capacity. This ensures a steady water supply for the city until the next monsoon season, eliminating the need for any water cuts.

The Brihanmumbai Municipal Corporation (BMC) provides 4,000 ML of water daily from these seven lakes. Five of these lakes are situated in Thane, Palghar, and Nashik districts, while Vihar and Tulsi are within Mumbai itself. As of September 27, lake levels were nearly full: Tansa at 98.49%, Modak Sagar at 99.99%, Middle Vaitarna at 99.84%, Upper Vaitarna at 99.58%, Bhatsa at 98.74%, Vihar at 100%, and Tulsi at 99.56%.

Water Stock Requirements

Mumbai needs a minimum of 14.47 lakh ML of water stock by October 1 to ensure an uninterrupted supply throughout the year. A senior civic official confirmed that "continued heavy rainfall in the catchment areas has pushed the stock beyond this requirement." Therefore, there will be no water cuts due to shortages until the next monsoon.

Civic data reveals that during this period in previous years, the lakes had similar levels: 14.38 lakh ML (99.38%) in 2024 and 14.42 lakh ML (99.66%) in 2023. Despite dry spells in June and up to mid-July over the past three years, heavy rains have consistently brought water stocks to around 99% by late September.

The consistent rainfall patterns have ensured that Mumbai's water supply remains stable despite occasional dry periods earlier in the year. This stability is crucial for a city with such a large population relying on these resources.

With the current levels being sufficient to meet demands until next year's monsoon, residents can rest assured about their water supply situation for now.