Chennai's desalination infrastructure currently produces 350 million litres per day (MLD) of potable water. The city operates three major Sea Water Reverse Osmosis (SWRO) facilities to combat monsoon reliance: the 100-MLD plant in Minjur Seawater Desalination Plant and the 110-MLD and 150-MLD plants in Nemmeli Seawater Desalination Plant.The city is significantly expanding its capacity to reduce freshwater stress. The upcoming 400-MLD facility at Perur (built with Rs 5,814 crore funding via the Japan International Cooperation Agency) is on track to be commissioned by late 2026. Once operational, it will become one of the largest plants in South East Asia, boosting Chennai's total desalination capacity to 750 MLD and providing drinking water to over 22 lakh people in the southern suburbs.The Chennai Metropolitan Water Supply and Sewerage Board (CMWSSB) manages the distribution of water from these plants across the region
https://www.wabag.com/project/swro-desalination-plant-chennai/
https://www.smec.com/in/project/chennai-perur-desalination-plant-india/
https://en.wikipedia.org/wiki/Minjur_Seawater_Desalination_Plant
https://www.ivrcl.com/desalination.php
The Minjur Desalination Plant is a reverse osmosis, water desalination plant at Kattupalli village, a northern suburb of Chennai, India, on the coast of the Bay of Bengal that supplies water to the city of Chennai. Built on a 60-acre site, it is the largest desalination plant in India
wiki/Nemmeli_Seawater_Desalination_Plant
https://www.wabag.com/project/desalination-plant-india/
The Nemmeli Desalination Plant is a water desalination plant at Nemmeli, Chennai, on the coast of the Bay of Bengal that supplies water to the city of Chennai. Initially the desalination plant experienced operational issues since the beginning and was shut down most of the time as contractor had installed the desalination plant without dissolved air floatation units leading to severe and regular choking of filters. It is located about 35 km south of the city centre, along the East Coast Road. Built at a cost of ? 5,333.8 million, the plant is the second desalination plant in the city after the 100-MLD (million litres per day) plant at Minjur and itself has a capacity to treat 100 million litres of seawater a day.[1]