Melbourne Water is upgrading the Western Trunk Sewer, which runs from Brooklyn Pumping Station to the Western Treatment Plant in Werribee. The 4.5 metre diameter sewer is an important part of our sewer network, carrying over 60 per cent of Melbourne’s wastewater for treatment in Werribee.

The Western Trunk Sewer was constructed in the late 1980s and is at the end of its service life. The sewer main consists of 15.2 kilometres of deep tunnel from Brooklyn Pumping Station to Hoppers Crossing Pumping Station and 7.3 kilometres of shallow tunnel from Hoppers Crossing Pumping Station to the Western Treatment Plant.

As part of Melbourne Water’s regular inspection program, it was revealed that three sections of the sewer and six manholes were at the end of their service life. The three sections of the sewer that need to be upgraded are pictured in the map below:

  • Wattle Avenue to Duncans Road, Werribee (next to the Princes Freeway)
  • Nunniong Street to Kiely Avenue, Werribee (next to the Princes Freeway)
  • Main Drive, Cocoroc (located on Melbourne Water land)

Western Trunk Sewer Upgrade Project map

Upgrading sewers is complex. In October 2019, Melbourne Water completed preliminary investigation works on the sewer to explore the best options for its rehabilitation. The results from the investigation will ensure the sewer is upgraded efficiently and safely whilst minimising the impacts to the community as much as possible.

Construction is due to start in 2020 and be completed by late 2021.

Contact us

For more information, please contact the Western Trunk Sewer Upgrade Project Team:

Last updated:
19 December 2019