MUMBAI: The metropolis has only 25 days of water available in its lakes.Despite a 20% water cut, which was imposed on Mumbaikars since August 2015, there is a deficit of nearly 67,816 million litres of water as compared to the stock on June 9 last year. The total stock in the seven lakes, which supply water to Mumbai, as on June 9 this year was 1.42 lakh million litres while it was 2 lakh million litres on the same day last year. “Last year by this time, Bhatsa and Tansa lakes had already started receiving some rain, which has not been the case this year,” a civic official said.“The India Meteorological Department’s monsoon forecast is good this year and therefore we are hoping that we may not have to use the reserve stock,” he added. In its weather forecast for Friday, the Met department has said that light rain or thundershowers are likely to occur.Due to an erratic monsoon in 2015, the BMC imposed a 20% water cut since August last year. A 50% water cut has also been imposed on shopping malls, star hotels, factories and stadiums.The BMC would earlier supply 3,750 million litres of water to Mumbai daily, now 3,200 million litres is being supplied. In March, the state government instructed all municipal corporations not to supply water to swimming pools till the monsoon began.In Mumbai, the BMC had already stopped water supply to all its swimming pools since August 2015. The Bhatsa reservoir has 25 days of water.