What is the Gnangara Groundwater System?

The Gnangara Groundwater System is the largest groundwater source in WA.

It comprises of three different aquifer layers:

  • Superficial aquifer - the shallowest aquifer which stretches across the coastal plain
  • Leederville aquifer - below the superficial aquifer, and is often several hundred metres thick
  • Yarragadee Aquifer - the deepest aquifer which offers vast storage and a robust supply

The Gnangara Groundwater System remains vital to our drinking water supply.