Chennai: The Government of India and the Asian Development Bank have signed a $230 million loan agreement to modernise and expand Chennai’s water-supply and sanitation infrastructure under the Chennai Climate-Resilient Water Security and Sewerage Project. The agreement was signed on 21 August 2026.

The project will construct more than 170 km of water-supply and sewer pipelines, upgrade seven water pumping stations and 38 sewer pumping stations, and strengthen the operation and management of water-sector assets. The programme is expected to benefit around 4.5 million people across Greater Chennai.

A major component will be a citywide ring-main water system, designed to improve pressure management and allow water to be distributed more efficiently between service areas. ADB describes Chennai as the first Indian city planned to implement such a comprehensive ring-main arrangement as part of an integrated urban water network.

The programme will also expand and modernise sewerage infrastructure, rehabilitate treatment-related assets and introduce digital monitoring. Real-time data, network monitoring and safer technologies for sewer inspection and blockage detection are expected to support improved service delivery and operational efficiency.

Climate resilience is another major focus. By strengthening bulk-water transmission, distribution reliability, sewerage collection and utility management, the project is intended to reduce system vulnerabilities while improving access to safe water and sanitation across approximately 426 sq. km of Chennai.

The financing agreement represents a significant implementation milestone, although individual construction packages will proceed through their respective procurement and contract-award stages. ADB’s project portal currently lists the overall project as approved and shows procurement activity, while no project contracts were listed as awarded in the latest information reviewed.