Think climate change. Be waterwise.

Indian ocean

How Perth's water sources have changed over time

Climate change has dramatically affected where we get our water from. Because rainfall is unpredictable, we now have a growing reliance on more energy-intensive and expensive, rainfall-independent drinking water sources. This includes desalinated seawater - water from the Indian Ocean with salt and impurities removed. There are fluctuations in our water source mix year to year, depending on how much rainwater we get. But, on average, Perth has relied on desalinated seawater over the past 5 years for around half of its drinking water supply. This is expected to increase in the future.

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Perth water supply map

Adapting our water supply to climate change

Ever wondered how climate change has affected our water supply?

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Monthly Streamflow


- GL

Year to date

Historical *

- GL

Avg year to date



- GL

Years of declining rainfall means less water flowing into your dams.

* Average monthly streamflow between 1911 - 1974


Latest updates


29 Jan 2024 | Update

Win tickets to The Pool

To celebrate our partnership with Black Swan State Theatre Company, we’re giving away 10 double passes to The Pool by Steve Rodgers. Find out how you could win tickets.

  • Community
13 Nov 2023 | Update

Our landmarks in the sky

The Perth metropolitan area and most of Western Australia is well served by water towers.

  • History
20 Oct 2023 | Update

Embedding waterwise thinking into everything we do

Our highly successful Waterwise Cities Program, which began in 2018, will now be transitioned into our core business.

  • Waterwise
  • Perth

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