Water supply in large swathes of south Calcutta that get their daily quota from the Garden Reach treatment plant will be suspended after 9am on Saturday for repairs.

Normal supply will resume at 6am on Sunday.

Kalighat, Kasba, Tollygunge, Chetla, Golf Green, Bansdroni, Garfa, Behala, Parnasree, Garden Reach, Joka, Budge Budge and Maheshtala are among the areas where the supply will be suspended.

Kolkata Municipal Corporation officials said many damaged valves and other components in the water treatment will be repaired or replaced during the shutdown.

“The water supply will be stopped after Saturday morning’s supply. There will be no supply in the evening. Services will resume on Sunday morning,” mayor Firhad Hakim said. “The shutdown will stop water supply to Kasba, Garden Reach Joka, Tollygunge, Budge Budge, Behala, Maheshtala. Water to boroughs VIII, IX, X, XI, XIV, XV, XVI and part of borough XII will be shut down.”

A KMC official said Kalighat, Chetla, Golf Green, Bansdroni, Garfa and Parnasree will also be affected.

Pumps and valves suffer natural wear and tear over the years and their timely replacement is essential to prevent a breakdown, the official said. “The shutdown is necessary for the repairs and replacement.”

The Garden Reach plant produces 210 million gallons of potable water every day and is the second largest, after the Palta facility in North 24-Parganas, among all the water treatment plants run by the KMC.

Besides supplying water to the KMC area, the potable water produced at the Garden Reach plant is also supplied to the neighbouring Maheshtala and Budge Budge.