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Find out our current and target daily, monthly and annual water use for the Integrated Water Supply Scheme, our largest scheme providing water for Perth, Goldfields and Agricultural Region and some parts of the South West.

Reducing the amount of water we all use and meeting targets will help secure a more climate resilient water supply.

Our water overview

Updated: Thursday, 11 July 2024 Learn more about how this data is updated

* Average monthly rainfall (for the period 1876 - 2016).
Dam volumes, rainfall and water use data is updated every working day, streamflow is updated weekly.

Water use in the metropolitan region and other areas

Actual water use and target water use reflect the whole Integrated Water Supply Scheme which supplies the metropolitan area and some parts of the South West and Goldfields.

Water use comparisons

How climate change is impacting our water sources

Water sources for our largest scheme, the Integrated Water Supply Scheme (IWSS) which supplies Perth, the Goldfields and Agricultural Region and some parts of the South West have changed dramatically. Water for the IWSS is now comprised of a combination of sources, including desalinated seawater, groundwater, groundwater replenishment and streamflow into dams.

Traditionally, Perth relied heavily on streamflow into our dams as a water source, but declining streamflow has meant dams now play a bigger role as storage reservoirs. The water in our dams is no longer just made up of inflows from rain. Groundwater and desalinated water are stored in these dams during periods of low demand so it is available when it is most needed in the hotter months.

How Perth's water sources have changed

Perth's water sources at a glance

In 2022-23 the breakdown of Perth's water sources (IWSS) consisted of:

Desalination icon
Groundwater icon
Dams icon
Groundwater replenishment icon
Groundwater replenishment