Project goal:

Secure long term water supplies for the region.


In construction

Delivery Date:


What's happening?

The Warren–Blackwood Regional Water Supply Scheme is undergoing significant upgrades to meet the long-term supply needs of Boyup Brook, Hester, Greenbushes, Balingup, Mullalyup, Kirup, Bridgetown, Nannup and Manjimup.

The Warren–Blackwood area is dominated by surface water sources, with limited groundwater available. Nine local surface water sources contribute to the scheme, as well as one groundwater bore, which is licenced to take up to 1.5 billion litres per year, from the Yarragadee Aquifier.

When complete, the scheme towns will be underpinned by a single, robust network of supply sources and infrastructure.

The scheme is rolling out a staged approach. Infrastructure will be extended and upgraded in accordance with future demand growth in the area.

Why is this happening?

This combination of surface and groundwater sources will help provide reliability and flexibility while minimising environmental impacts. Smaller, unreliable dams in compromised catchment areas will ultimately be decommissioned, resulting in improved aesthetic water quality and operational efficiencies

When is this happening?

Current projects under construction or in the planning phase:

  • Greenbushes to Kirup Link – a 13 kilometre pipeline between Greenbushes and Kirup is in the approvals stage, and construction is expected to start in late 2020.
  • Regional Water Treatment Plant – a new water treatment plant may also be required to service the expanding scheme. A proposed site for the Bridgetown Regional Water Treatment Plant was secured during 2011 and is expected to come online sometime after 2021. The exact timing is dependent on the performance of the existing water treatment facilities at Bridgetown and Greenbushes, so this is yet to be confirmed.

Various projects have already been completed in the scheme upgrade, including:

  • Millstream-to-Greenbushes pipeline – a new 16.2 kilometre pipeline between Millstream Dam and the town of Greenbushes commenced in November 2013. Construction on this project was completed at the end of January 2017. Commissioning of this new pipeline, with water being supplied into Greenbushes was completed on 1 March 2017. Two new pump stations and two one million litre storage tanks were also constructed as part of this work.
  • Hester Dam remedial works – an upgrade to Hester Dam was completed in April 2011, ensuring the reservoir can continue to operate at full capacity. This project involved modifications to the dam embankment and new outlet works.
  • Hester-to-Boyup Brook pipeline upgrade – works to duplicate the existing 9 kilometre pipeline between the Hallett tanks and Boyup Brook were completed in October 2015.
  • Doubling the capacity of Millstream Dam – works to upgrade the Millstream Dam from 0.45 billion litres to 1 billion litres capacity were completed in January 2013. The upgrade to the Scheme’s central storage component enables capture of more water during wet years, ensuring adequate surface water storage capacity.
  • Manjimup supply from Nannup Bore – in June 2013, Manjimup joined the Scheme following the construction of a pipeline to link the Nannup bore to Manjimup Dam. Whilst the town’s two dams will remain the principal supply source for Manjimup, the new pipeline is now supplementing Manjimup Dam with groundwater as required, securing water supply for the town even in the driest of years.
  • Yarragadee Bore – a new bore near Nannup was completed in 2009 and has since been used to boost supply to Bridgetown, Boyup Brook and Hester via Millstream Dam when needed.

Water conservation

While this infrastructure will guarantee a safe, reliable and sustainable drinking water supply in an increasingly dry climate, demand management remains a vital aspect of our strategy to deliver long-term climate resilience to the 8 scheme communities.

To support achievement of this objective, water efficiency and other compliance measures will continue to be complemented by educational initiatives and partnerships as required.

Communities in the Warren–Blackwood are commended for embracing water conservation efforts to date.