Mumbai’s drinking water situation saw a modest improvement on Wednesday as sustained monsoon showers pushed reservoir levels slightly higher across the city’s key lake systems.
According to the Hydraulic Engineer’s Department report released at 6 am on July 1, the combined water stock in the seven lakes supplying Mumbai now stands at 1,03,871 million litres, equal to 7.18% of total live storage capacity. This marks a small increase from Tuesday’s level of 6.75%, reflecting the impact of intensified rainfall over the last 48 hours.
Catchment Rainfall Strengthens Reservoir Inflows
The improvement in storage levels is directly linked to heavy rainfall across Mumbai’s catchment regions. In the past 24 hours, several key reservoirs recorded significant precipitation:
- Modak Sagar: 193 mm
- Tansa: 180 mm
- Bhatsa: 120 mm
- Tulsi: 100 mm
- Vihar: 83 mm
The Bhandup Complex, which plays a crucial role in water treatment and distribution, recorded 137 mm rainfall, pushing its seasonal rainfall accumulation to 544 mm.
Meteorological conditions remain active under an India Meteorological Department (IMD) Orange Alert, with forecasts indicating continued heavy rain spells across Mumbai and the broader Konkan belt in the coming days.
Reservoir-Wise Water Storage Position
Despite the overall improvement, water levels remain uneven across the lake system:
- Vihar Lake: 50.77% (highest among all reservoirs)
- Tulsi Lake: 28%
- Modak Sagar: 20%
- Middle Vaitarna: 11.71%
- Bhatsa: 4.90%
- Upper Vaitarna: 0% usable storage (below lowest drawable level)
Officials clarified that water stored below the lowest drawable level in Upper Vaitarna is not considered part of the usable supply, and therefore does not contribute to Mumbai’s active reserves.
Monsoon Impact Brings Cautious Optimism
While the recent rainfall has provided slight relief to the city’s water situation, overall storage levels remain low compared to full capacity requirements. The marginal rise is being viewed as an early monsoon recovery phase rather than a structural improvement in supply security.
Authorities continue to monitor inflows closely as further rainfall is expected to influence reservoir levels in the coming days. For now, Mumbai’s water supply system remains heavily dependent on sustained monsoon performance to bridge the seasonal deficit.
