Jandakot Mound

The Jandakot Mound, or Jandakot Groundwater Mound, is an unconfined aquifer in south-western Western Australia. It is the smaller of the two main shallow aquifers near Perth (the other being the Gnangara Mound, north of the Swan River) that together supply about 40% of Perth's drinking water. Its highest point lies about 18 km south of Perth’s central business district. It stretches from the Swan River in the north to the Serpentine River in the south, and from the Indian Ocean in the west to the Darling Scarp and Southern River in the east, covering an area of about 760 km².

The Jandakot Mound is a sand aquifer with a saturated thickness of up to 40 m. It contains an estimated 4 200 gigalitres of fresh water, and the annual recharge can reach 76 GL. It contributes 9 GL annually to Perth’s municipal supply of drinking water and is also heavily used for private supplies. Where it is close to the surface, it supports extensive wetland systems, the most important of which are Forrestdale and Thomsons Lakes. It also recharges the deeper confined aquifers in the area, the Leederville and Yarragadee Aquifers.