July 24, 2025: Tansa Lake, one of Mumbai’s seven major reservoirs supplying drinking water, began overflowing on Wednesday evening due to continuous heavy rainfall across the region, civic officials confirmed.
This makes Tansa the second reservoir to overflow this monsoon season, following Modak Sagar, which reached full capacity on July 9. Prior to that, the Brihanmumbai Municipal Corporation (BMC) had opened three gates of the Middle Vaitarna Dam on July 7 in response to rising water levels.
In a post on X (formerly Twitter), the BMC stated: “Tansa Lake, one of the lakes supplying water to Mumbai, started overflowing at around 5:40 pm today. The full storage capacity of Tansa Lake is 14,508 crore litres (145,080 MLD).”
The heavy monsoon showers lashing Mumbai and its neighbouring areas, including several parts of Maharashtra, have significantly raised water levels in the lakes’ catchment zones. As of Wednesday morning, the BMC reported that the total water stock across all seven lakes had reached 86.88% of their combined capacity, amounting to approximately 12.57 lakh million litres.
Tansa, located in Thane district, receives water from high-rainfall catchment areas. Other lakes showing high water levels include Middle Vaitarna (94.25%), Upper Vaitarna (76.64%), Bhatsa (84.86%), Vihar (57.28%), and Tulsi (58.75%).
The BMC sources Mumbai’s daily water supply from Upper Vaitarna, Middle Vaitarna, Modak Sagar, Tansa, Bhatsa, Vihar, and Tulsi. Tansa, Modak Sagar, and the Vaitarna reservoirs serve the western suburbs from Dahisar Check Naka to Bandra and areas from Mahim to Malabar Hill. The Bhatsa system—comprising Bhatsa, Vihar, and Tulsi—supplies water to the eastern suburbs from Mulund to Sion and further to Mazgaon via the Panjarpur Water Treatment Plant.
Source: Mid- day
