It marks Tansa as the second reservoir to overflow this monsoon season, following Modak Sagar, which reached capacity on July 9. Prior to that, the BMC had opened three gates of the Middle Vaitarna Dam on July 7
The full storage capacity of Tansa Lake is 14,508 crore liters (145, 080 MLD). Pic/Videograb/X
Tansa Lake, one of the seven key reservoirs supplying drinking water to Mumbai, began overflowing on Wednesday evening, civic officials said.
It marks Tansa as the second reservoir to overflow this monsoon season, following Modak Sagar, which reached capacity on July 9. Prior to that, the BMC had opened three gates of the Middle Vaitarna Dam on July 7.
In a post on X, the Brihanmumbai Municipal Corporation (BMC) wrote, "Tansa Lake, one of the lake supplying water to the Mumbai, has started overflowing at around 5:40 pm today. The full storage capacity of Tansa Lake is 14,508 crore liters (145, 080 MLD)."
Mumbai and its adjoining areas including several parts of Maharashtra has been receiving heavy rains for past several days.
Due to continuous heavy rainfall across the region, the total water stock across all seven lakes has now reached 86.88 per cent, officials said.
The catchment areas of Tansa lake, located in neighbouring Thane district of Maharashtra, have received intense rainfall.
The lake, which has a total storage capacity of 14,508 million litres, began overflowing at 5:40 pm on Wednesday, officials said.
⛈️ बृहन्मुंबई महानगरपालिका क्षेत्राला पाणीपुरवठा करणाऱ्या तलावांपैकी महत्त्वाचा असणारा तानसा तलाव आज सायंकाळी ५. ४० वाजेच्या सुमारास पूर्ण भरुन वाहू लागला आहे.
— माझी Mumbai, आपली BMC (@mybmc) July 23, 2025
तानसा तलावाची कमाल जलधारण क्षमता १४,५०८ कोटी लीटर (१४५, ०८० दशलक्ष लीटर) इतकी आहे.
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⛈️Tansa Lake, one of the lake… pic.twitter.com/pGHwYegwrk
Earlier in the day, the BMC had said that the water levels in lakes supplying drinking water to Mumbai have risen following heavy rainfall in their catchment areas.
As per the BMC on Wednesday (July 23) morning, the collective water stock in these reservoirs is 12,57,442 million litres, which amounts to 86.88 per cent of their total capacity.
The BMC supplies drinking water daily from Upper Vaitarna, Modak Sagar, Tansa, Middle Vaitarna, Bhatsa, Vihar, and Tulsi lakes.
Of these, Tansa has overflowed on July 23 evening, Modak Sagar has 100 per cent water stock, Middle Vaitarna 94.25 per cent, Upper Vaitarna 76.64 per cent, Bhatsa 84.86 per cent, Vehar 57.28 per cent and Tulsi 58.75 per cent.
Lower (Modak Sagar), Middle and Upper Vaitarna lakes, along with Tansa, supply water to the western suburbs from Dahisar Check Naka to Bandra and to the western parts of the city from Mahim to Malabar Hill.
Bhatsa, Vehar, and Tulsi together form the Bhatsa system. Water from this system is treated at the Panjarpur Water Treatment Plant and distributed to the eastern parts of Mumbai, covering the eastern suburbs from Mulund Check Naka to Sion and further to Mazgaon.
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