The Integrated Water Supply Scheme (IWSS) is the largest scheme we manage. It delivers 303 billion litres of water each year to over 2 million people in Perth, the Goldfields and Agricultural region and some parts of the South West.

The IWSS is made up for the following water sources:

  • Desalinated seawater
  • Groundwater
  • Dams
  • Groundwater replenishment

In future more water will come from desalination, secure groundwater sources and groundwater replenishment and less from our dams. Learn more about Perth’s water supply with our interactive tool.

We have developed a long term plan to ensure our future generations have a secure water supply. Learn more about our goals for 2030.