The civic body's promises about uninterrupted water supply till July 15 have been thwarted by the continuing dry spell.
The Brihanmumbai Municipal Corporation (BMC) on Wednesday announced that a 10% water cut beginning from July 1 would be imposed across the city.
"Catchment areas of lakes have received insufficient rainfall. A water cut has been planned to preserve stocks," said Rajiv Jalota, additional municipal commissioner (in charge of water supply) at the civic standing committee meeting on Wednesday.
Hindustan Times had reported on Wednesday that the city, which receives about 3,430 million litres of water per day, has only 20 days' worth of water stock in its lakes.
Useful water content in the city's six lakes – Modak Sagar, Tansa, Bhatsa, Upper Vaitarna, Vehar and Tulsi – from which potable water is drawn, is less than half of what it was in 2011.
Even more worrying is the fact that the useful water content in 2009 — the year in which the city received abysmally low rainfall and water cuts were imposed through the entire monsoon period – was 1,68,679 million litres while the useful water content this year is merely 70,622 million litres.
However, the civic body maintained that if it rains sufficiently in the next two-three days, there are chances that the cut could be called off.
"Since water cuts would be imposed only from July 1, we will reconsider the cuts if it rains well in the next few days," added Jalota.