Inhabitants supplied

First project of the Water business in Western Australia

The ACCIONA JV is the delivery contractor for the project and is responsible for the design, construction, operation and maintenance of the A$300M water treatment plant.

The Helena Water consortium, comprising ACCIONA, TRILITY, and Aberdeen Global Infrastructure Partners, won the tender to design, build and operate the Mundaring drinking water treatment plant in the Perth area (Western Australia) for a 35 year period.


The plant supplies the Goldfields and Agricultural Water System (G&AWS), including Kalgoorlie in the state of Western Australia. Its initial capacity will be 165,000 m3 per day, with a maximum capacity of around 240,000 m3 per day.


This is a PPP (Public Private Partnership) project in the state of Western Australia. 


  • Entity: Water Corporation
  • Location: Mundaring, Western Australia
  • Population Served: 100,000 inhabitants
  • Flow: 165,000 m3/day


  • 3 power supplies
  • Raw water pumping
  • Chemical treatment and flocculation
  • Flotation - filtration: DAFF
  • Activated carbon filtration (BAC)
  • Dissolved Organic Carbon Removal (DOC)
  • Ultraviolet and chloramines disinfection
  • Recarbonation
  • Sludge treatment
  • Product water pumping


  • 24/7 security of supply
  • Australian Drinking Water Guidelines (ADWG) compliance
  • Low corrosive product water for distribution pipework
  • Disinfection control


Key figures


inhabitants served


m3 per day


years of D&C and O&M contract

Awards and recognitions

technologies and innovation

Dissolved Air Flotation Filtration (DAFF)

Biological Activated Carbon (BAC)

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