The Perth Seawater Desalination Plant, located in Kwinana, started production in 2006. On average, the Perth Seawater Desalination Plant produces 15% of Perth's water supply. The plant has the capacity to output 50 billion litres of water per year - enough to fill Optus stadium 50 times. 

 Perth Seawater Desalination Plant 

Protecting the environment

We are dedicated to protecting the marine environment of Cockburn Sound. We achieve this by:

  • undertaking continuous, real-time water quality monitoring of water entering and leaving the plant
  • undertaking routine marine monitoring at various locations in Cockburn Sound and regular performance tests on the diffuser system
  • working closely with local groups, and
  • regularly inspecting all offshore infrastructure to make sure the plant is working at maximum efficiency.

Since operations began, we have met all environmental requirements as detailed in our operating licence issued by the Department of Environment Regulation and the conditions and commitments specified in Ministerial Statements 655 and 832 issued by the Office of the Environmental Protection Authority.

Read our most recent compliance report.

Underwater footage from the plant

Protecting the coast

In partnership with the Perth Region Natural Resource Management group, we plant native shrubs in the dunes near the plant. This has helped prevent erosion and encouraged native fauna back to the area after construction. We also hold an annual clean-up of rubbish on the stretch of beach close to the plant.

Working with our stakeholders and the community

We continue to work closely with the Cockburn Sound Management Council (CSMC) and support their ongoing environmental monitoring and annual reporting requirements. Water Corporation is an active member on the CSMC Reference Group and Kwinana Industries Council.

We're also proud partners with Ozfish Seeds for Snapper program. The program is one of Australia's largest seagrass restoration projects. Volunteers collect and disperse more than 1 million seeds in Cockburn Sound each year. Seagrass meadows provide nursery grounds for fish and help prevent shoreline erosion. Read more about our Ozfish partnership

Underwater photos

Inspections of our marine intake show a variety of fish, crabs, octopus, seahorses, mussels, barnacles, sponges, algae and hard and soft corals colonising the outfall.

All photos were taken by Fremantle Commercial Diving on behalf of Water Corporation.