Why is water supply a major concern in Western Australia?

Water supply is a persistent concern in Western Australia primarily due to the uneven distribution and quality of the state's freshwater resources. Approximately three-fourths of the state's surface freshwater is located in the Kimberley region, far from the more populated areas.1

Furthermore, the state faces significant challenges regarding water quality and availability:

• Salinity: Much of the state's inland drainage is characterized by saline playas rather than fresh water. In the southwestern region, even the largest rivers, such as the Swan, are saline because their headwaters originate in agricultural areas.2
• Limited Permanent Flow: Permanently flowing streams are restricted to the southwestern segment of the Yilgarn block, while many other rivers are ephemeral, flowing only after major rainfall or during cyclone seasons.2
• Reliance on Groundwater: Because of these surface water limitations, the state relies heavily on groundwater, such as the aquifers in the Perth Basin, which provide about half of Perth’s water supply.1

These geographic and environmental factors necessitate careful management of limited freshwater resources to support the state's population and industries.1