Supply from the Palta water treatment plant and the Tallah water reservoir will remain suspended from 9am on Monday to 6am on Tuesday because of maintenance work at the two facilities, a senior official in the Kolkata Municipal Corporation (KMC) said.

Potable water from the Tallah tank is supplied to the entire north Calcutta, large parts of central Calcutta and some parts of south Calcutta. A few wards of the Bidhannagar Municipal Corporation also get a portion of its daily potable water supply from the 113-year-old reservoir in north Calcutta.

A notice issued by the KMC announcing the suspension of water supply said "filtered water supply will remain suspended in Borough-I to Borough-VII and part of Borough-VIII including Kasba".

A KMC official said parts of south Calcutta such as Bhowanipore would get affected.

An official in the Bidhannagar civic body said water supply might take a hit in parts of Salt Lake, including ward numbers 29, 30, 31, 32, 33, 34, 40 and 41.

"Water supply will be stopped at 9am on Monday and will resume at 6am on Tuesday," said a senior KMC official.

The KMC had earlier planned to suspend water supply from 9am on December 14 to 6am on December 15 but it was deferred because of the wedding season.

"Many wedding receptions were scheduled for the weekend, so the authorities told us not to suspend water supply on Saturday and Sunday. So, we pushed back the shutdown by a day," said a source in the KMC.

"The shutdown is necessary to replace valves and pumps at the Palta water treatment plant and the Tallah reservoir. It will allow us to do some routine maintenance work," the KMC official said.

A notice by the KMC announcing the shutdown cites the need for "installation and repair of higher diameter valves, electro-mechanical drives, H.T. pumps, high voltage motors/electrical appliances, leakage repairing work on high diameter pipelines".