Modak Sagar, one of the seven lakes supplying water to Mumbai, began overflowing at 6.27 am on Wednesday, becoming the first lake to overflow this monsoon. The full storage capacity of Modak Sagar is 1,28,910 million litres. In the 24 hours between 6 am on Tuesday and 6 am on Wednesday, its catchment area received 4 mm of rainfall.

So far this monsoon, Modak Sagar’s catchment area has received a total of 1405 mm of rainfall over 43 days since the onset of the monsoon on May 26, 2025. The lake is located in Thane district, on the Vaitarna river, which originates in Igatpuri, Nashik.

On the same day last year, Modak Sagar was only 37.71 per cent full, amounting to 48,624 million litres of water. As of Wednesday morning, the combined water stock in the seven lakes that supply drinking water to Mumbai stood at 72.61 per cent or 10,50,912 million litres. In contrast, it was just 20.45 per cent, or 2,96,349 million litres, on the same day last year, and 23.11 per cent, or 3,34,530 million litres, on the same day in 2023. The lakes have a total storage capacity of 14,47,363 million litres.