Mumbai’s seven water-supply lakes held 1,390,236 million litres of useful live storage, or 96.05 per cent of their combined capacity, as of 6 am on October 2, according to the Hydraulic Engineer’s Department’s Master Control Centre at the Bhandup Complex.
The seven reservoirs—Upper Vaitarna, Modak Sagar, Tansa, Middle Vaitarna, Bhatsa, Vihar and Tulsi—have a combined useful capacity of 1,447,363 million litres. The latest overall stock is below the levels recorded on the same date in 2025 and 2024, when the combined storage stood at 100 per cent and 99.75 per cent respectively, based on the figures reported for the individual lakes.
Upper Vaitarna held 219,332 million litres, equal to 96.60 per cent of its useful capacity. Its water level was 603.27 metres, against a full supply level of 603.51 metres, and did not change over the previous 24 hours. The lake recorded no rainfall on October 2, while its seasonal rainfall total was 3,896.00 mm. On the same date in 2025, it held 226,565 million litres, or 99.79 per cent of useful content.
Modak Sagar had 101,166 million litres, or 78.47 per cent of its useful capacity. Its level fell by 0.21 metres in the preceding 24 hours to 159.73 metres, compared with a full supply level of 163.15 metres. Tansa held 137,406 million litres, representing 94.71 per cent of capacity, after its level declined by 0.03 metres. Its level was 128.23 metres, against a full supply level of 128.63 metres.
Middle Vaitarna recorded 192,564 million litres, or 99.50 per cent of useful capacity. Its water level increased by 0.04 metres to 284.67 metres, close to its full supply level of 285 metres. Together, Upper Vaitarna, Vaitarna, Tansa and Middle Vaitarna held 650,467 million litres, or 93.65 per cent of their combined useful capacity of 694,582 million litres. The comparable combined figure was 99.39 per cent in 2025 and 99.51 per cent in 2024.
Bhatsa, one of the largest reservoirs in the system, held 704,142 million litres, equal to 98.20 per cent of its useful capacity. Its level was 141.60 metres, against a full supply level of 142.07 metres, after falling by 0.06 metres over the previous 24 hours. The reservoir’s seasonal rainfall total was 2,715.00 mm, and it received no rainfall on October 2.
Vihar was at 100 per cent of its useful capacity, with 27,698 million litres in storage. Its level was 80.17 metres, compared with a full supply level of 80.12 metres, and declined by 0.01 metres in the last 24 hours. Tulsi held 7,928 million litres, or 98.53 per cent of capacity, with its level falling by 0.01 metres to 139.09 metres. Both reservoirs recorded no rainfall on October 2.
The data shows that Mumbai’s overall reservoir stock remains high, although several lakes are below their corresponding 2025 levels and some recorded small declines during the preceding 24 hours. The next update from the Hydraulic Engineer’s Department will indicate whether these levels change with further rainfall, inflows and daily drawdown from the reservoirs.
