The award recognises the planning and design of the new facility
The Loch Katrine Water project has been named as this year's winner of the Saltire Award for Civil Engineering.
The £120m plant, which supplies 700,000 consumers in Glasgow, was among the largest engineering feats undertaken by the Scottish water industry.
The facility replaces Victorian water works opened in 1859.
The Saltire Society said the project was an example of civil engineering's greatest contributions to society - the provision of clean safe drinking water.
Other projects across Scotland were also recognised by the award's panel which handed out commendations to the Dundee gas works land remediation scheme and the Clydebank Swan project.
Engineers involved in post tensioning work for the Clunie dam in Perthshire, the Melrose Town Centre project and those behind plans to regenerate Waverley station in Edinburgh were also recognised.
At Loch Katrine in the Trossachs, two tunnels linking Mugdock and Craigmaddie reservoirs, treatment works and tanks were all covered over with turf to blend in with surrounding pasture land.
Water from Loch Katrine will be filtered and treated at Milngavie.
The huge project, which officially opened earlier this year, follows a cryptosporidium contamination emergency in 2002 in which 160,000 people were told to boil their water.