Perth Seawater Desalination Plant

The Perth Seawater Desalination Plant, located in Kwinana, was completed in late 2006. It produces 45 billion litres of fresh drinking water a year – around 17% of Perth’s water supply.

Renewable energy and environmental safeguards

To ensure sustainability, the energy requirements of the plant are purchased from a wind farm north of Perth.

Protection of the sensitive marine environment of the Cockburn Sound is vital and we work closely with the Environmental Protection Authority to meet stringent criteria.  The plant is subject to a rigorous ocean monitoring program.

Underwater footage from the plant


The plant has won numerous national and international awards including the International Desalination Association’s International Desalination Plant of the Year in 2007.

Marine Monitoring Program

As part of our operating licence issued by the Department of Environment and Conservation, certain dissolved oxygen levels must be met in the deep basin of Cockburn Sound.  Dissolved oxygen, and near seabed dissolved oxygen is measured at four permanently anchored buoys, which relay real-time data back to head office every few minutes. If there are instrument problems, we can substitute manual sampling to ensure dissolved oxygen data is collected consistently.

Dissolved oxygen monitoring results

In general, the dissolved oxygen levels from the buoys are reading low, and actual dissolved oxygen levels are higher.  Because the instruments are under reading, this data is conservative and ensures that Cockburn Sound is protected. We have an ongoing program to improve the accuracy of the instruments.

Monthly dissolved oxygen graphs 2014

Monthly dissolved oxygen graphs 2013

Monthly dissolved oxygen graphs 2012

Near seabed dissolved oxygen monitoring

Near Seabed Dissolved Oxygen (NSDO) monitoring was introduced in the Perth Seawater Desalination Marine Monitoring Management program in order to establish the relationship between dissolved oxygen saturation at 0.5m and 0.2m above the seabed. NSDO loggers were deployed at 0.2m and 0.5m above the seabed on the 29th April 2011 at two sites.

Near seabed report June 2013

Near seabed report May 2013

Near seabed report April 2013

Near seabed report March 2013

Near seabed report February 2013

Near seabed 6 month review Nov 2011