Mumbai | August 18, 2025
After weeks of relentless monsoon showers, Tulsi Lake in Mumbai has finally begun overflowing, offering much-needed relief to the city’s residents. The lake, located inside Sanjay Gandhi National Park, reached its full capacity at 6:45 am on Saturday, making it the third reservoir to overflow this monsoon, after Tansa and Modak Sagar.
According to the Brihanmumbai Municipal Corporation (BMC), all seven reservoirs supplying drinking water to the metropolis now hold over 90% of their combined storage capacity, ensuring a stable Mumbai water supply in the near future.
Key Facts About Tulsi Lake and Mumbai’s Water Needs
- Tulsi Lake storage capacity: 8,046 million litres (ML)
- Daily supply to Mumbai: 18 ML
- Total daily water demand of Mumbai: ~3,850 ML
- Population benefiting: Over 20 million residents
- Overall stock across reservoirs: 90%+ as of August 18
Reservoir Status (August 2025):
- Tansa – 100% (Overflowing)
- Modak Sagar – 100% (Overflowing)
- Tulsi Lake – 100% (Overflowing)
- Vihar – 88% (Not full yet)
- Powai – Overflowed in June (Non-potable)
- Bhatsa, Upper Vaitarna, Middle & Lower Vaitarna – 90–95% filled
Yearly Comparison & Rainfall Impact
Last year, Tulsi Lake overflowed by July 20, nearly a month earlier than this season. The delayed overflow highlights the late onset of consistent rainfall in Mumbai’s catchment zones. Interestingly, Powai Lake filled unusually early this year, overflowing in June, while Tulsi lagged by almost a month — showing a changing monsoon pattern.
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Why This Matters for Mumbai
Tulsi Lake is the smallest of the seven reservoirs, yet it plays a vital role in the Mumbai water supply system. Once the lake overflows, excess water naturally flows into nearby Vihar Lake, strengthening reserves further. With over 20 million people depending on these water sources, this overflow signals relief for the city’s daily requirements.
However, BMC officials have cautioned that September rainfall remains critical. If monsoon activity weakens, next summer could still bring water cuts despite the current stock. Citizens are urged to use water judiciously even as reservoirs brim with abundance.
