Traditionally Perth has relied heavily on our dams as a water source. Today, the water in our dams is no longer just made up of inflows from rain. Find out about the changing role dams are playing in our water supply.

Perth's recent rainfall is welcome but it has made little difference to our dam levels. While it may look like dam levels are increasing slightly during the colder months, this may not be the result of increased streamflow.

Water produced from deep groundwater and desalination is transferred into our dams for storage during periods of low demand so it is available when it is most needed in the hotter months. This will help ensure climate independent, year-round water production.

North Dandalup Dam

Dams help move water around

We use dams to move water around, including supplying towns in the Goldfields and Agricultural areas through the CY O’Connor Goldfields Pipeline.

Increasing connectivity of our dams for security and flexibility

In recent years we have connected more of our southern dams.

This provides greater flexibility and security to Perth and the South West, as it allows towns’ access to a wider range of water sources.

The role of dams in regional areas

Positive rainfall and stream flow trends in some northern areas of our state mean many towns in the Pilbara and Kimberley regions will continue to be supplied by traditional surface water and groundwater sources.

Find out more information about our catchments