Integrated Water Supply System

More information

	Dams
	Groundwater
	Perth Seawater Desalination Plant

The Integrated Water Supply System (IWSS) delivers water to 1.6 million people across Perth, the South West, Kalgoorlie-Boulder and the Wheatbelt, Goldfields and Agricultural regions.

Water for the IWSS comes from three sources:

Surface water is obtained from dams (storage reservoirs) on rivers in the Darling Range. Surface water sources supply approximately 20-35% of the water. The dams supplying water are Canning, Serpentine, Serpentine Pipehead, Conjurunup Pipehead, Victoria, Mundaring Weir, South Dandalup, North Dandalup, Wungong, Stirling and Churchman's Brook. Note that Mundaring Weir normally only supplies water to the Goldfields and Agricultural Region.

Groundwater, supplying 50-60% through the integrated system, is obtained from huge natural reservoirs in the deep sands of the coastal plain. It is treated at groundwater treatment plants at Jandakot, Mirrabooka, Wanneroo, Neerabup, Lexia and Gwelup before being added to the distribution system.

The Perth Seawater Desalination Plant in Kwinana supplies 15-20% of water needs. The largest desalination plant in the southern and eastern hemispheres, it produces on average 130 million litres of water a day.