The Gnangara groundwater system is Perth’s lowest cost and largest source of good quality water. The Gnangara groundwater areas consist of three main aquifers – the unconfined Superficial aquifer (commonly known as the Gnangara Mound), the deep, partly confined Leederville aquifer and the deep, mostly confined Yarragadee aquifer.
The Gnangara system currently provides almost half of all the water used in the Perth metropolitan area each year. It supplies water for agriculture, parks, ovals and gardens on the Gnangara system, and water for Perth’s scheme supply – distributed by the Water Corporation.
Gnangara groundwater also supports environmental features such as lakes, wetlands and bushland areas.
Gnangara groundwater is Perth’s lowest cost water source and the economic benefits have been estimated at a total net present value of $6.7 billion, which is equivalent to about $400 million a year.
