Milngavie water treatment works is a Scottish Water-operated water treatment facility located in Milngavie, Scotland. It is the primary source of water for the city of Glasgow in western Scotland. Part of the Victorian Loch Katrine water project, construction was started in 1855 and the works was opened by Queen Victoria in 1859, replacing the previous water supply sourced from the River Clyde at Cuningar Loop in Dalmarnock.