Our water overview

Updated: Tuesday, 07 July 2020



268 GL

Last year


284 GL



-16.2 GL

To 9am



May total

May average*





Check rainfall and dam volumes, and find out how declining rainfall is affecting the amount of water that flows into our dams. You can also learn where we source your water from and how our water usage is tracking.

We need steady, regular rain in order to soak our catchments and get water flowing into our dams. Slowly declining rainfall means Perth's dams receive much less streamflow than in past years. Streamflow is the amount of water entering our dams from our catchments and is measured by changing water storage levels.

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.

Learn more about how the impact of climate change continues to affect rainfall, the streams that flow into our dams and water use.

Our water sources

Our water supply is made up of a combination of sources, including desalinated seawater, groundwater, groundwater replenishment and streamflow. As climate change continues to have a profound impact on our water supply, we must plan our future by securing climate-resilient water sources. Below is a breakdown of our water sources.

You can also learn more about where your water comes from on our Perth's water supply tool.
Desalination icon
Groundwater icon
Dams icon
Groundwater replenishment icon
Groundwater replenishment


Latest dams & rainfall news

12 Jun 2020 | Update

Recreation equipment reopens at Water Corporation dams

Playgrounds and barbecue facilities at Western Australian dams managed by Water Corporation have reopened.

  • COVID-19
  • dams
Harvey Dam
15 May 2020 | Media Release

Perth metro weekly water update - 15 May 2020

Weekly water update

  • dams