Mumbai: Mumbai's water reserves have fallen to a worrying 9% of total storage capacity, raising concerns about the city's water security as residents await stronger monsoon rains expected later this month.

Mumbai's seven key reservoirs have slipped to critically low levels, with the Brihanmumbai Municipal Corporation (BMC) reporting that the city's combined water stock stood at only 130,275 million litres as of June 20. This represents just 9% of the reservoirs' total live storage capacity of 1,447,363 million litres.

The sharp decline has intensified concerns over water availability for India's financial capital, particularly as significant monsoon rainfall has yet to reach the catchment areas feeding the reservoirs.

Mumbai's largest reservoirs under pressure

Among the reservoirs supplying Mumbai, Upper Vaitarna has completely exhausted its live storage and currently has no usable water remaining.

Tansa is also facing severe depletion, holding just 5,015 million litres of water, equivalent to only 3.46% of its storage capacity.

Bhatsa, Mumbai's largest and most important water source, remains at critically low levels. Despite having a capacity of 717,037 million litres, it currently contains only 59,518 million litres, or 8.3% of capacity.

Middle Vaitarna is also under strain, with reserves standing at 20,008 million litres, representing 10.34% of its full capacity.

Smaller lakes offer limited relief

While the major reservoirs continue to struggle, some smaller lakes are in relatively better condition.

Modak Sagar currently holds 32,463 million litres of water, placing it at 25.18% capacity.

Tulsi Lake, the smallest in Mumbai's reservoir network, is 22.28% full with 1,792 million litres of water available.

Vihar Lake has the highest percentage storage among all seven reservoirs. It currently stands at 41.44% capacity, containing 11,478 million litres of water.

However, the smaller reservoirs alone are insufficient to meet Mumbai's massive daily water requirements, making replenishment of larger lakes crucial.

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Monsoon forecast offers hope

Weather forecasts suggest relief may be on the horizon. Mumbai is expected to experience increasing rainfall activity from June 22 onwards as monsoon conditions strengthen across the region.

The India Meteorological Department has issued yellow alerts for several days, warning of thunderstorms, lightning, gusty winds of 30–40 kmph and periods of rain.

Temperatures are also expected to ease slightly as rainfall activity increases.

Will the rains be enough?

The answer depends largely on rainfall in the reservoir catchment areas spread across Mumbai, Thane and Nashik districts.

Experts note that reservoir levels can rise rapidly if heavy and sustained rainfall occurs over catchment regions rather than only within the city itself. Strong monsoon showers over the coming weeks could significantly improve storage levels and reduce concerns about water shortages.

If substantial inflows are recorded, the BMC may eventually reconsider water conservation measures and restrictions imposed due to declining reserves.

For now, however, Mumbai remains heavily dependent on the arrival of widespread monsoon rainfall to avert a deeper water supply crisis.