Our water overview

Updated: Wednesday, 12 August 2020

Current

42.5%

268 GL

Last year

45%

284 GL

Change

5.7%

-16.2 GL

To 9am

0.00

mm

May total

May average*

32.20

mm

88.70

mm

Reducing the amount of water we all use and meeting targets will help secure a more climate resilient water supply. Usage and target usage reflects the whole Integrated Water Supply Scheme which supplies the Metropolitan area and some parts of the South West and Goldfields.

Water usage in the Metropolitan region and other areas

How climate change has impacted our water sources

Water sources for our largest scheme, the Integrated Water Supply Scheme (IWSS), 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.

See how our climate has changed

Below is a breakdown of our IWSS water sources:

Desalination icon
%
Desalination
Groundwater icon
%
Groundwater
Dams icon
%
Dams
Groundwater replenishment icon
%
Groundwater replenishment