Construction of Australia’s first full-scale Groundwater Replenishment Scheme is progressing with Water Corporation completing a pipe cut-in that will divert treated wastewater to the scheme’s new advanced water recycling plant.  

The cut-in was made to the outfall pipe from the Beenyup Wastewater Treatment Plant in Craigie. This pipe can transfer up to 135 million litres of treated wastewater per day by gravity to the ocean.

Water Corporation General Manager Assets Delivery, Mark Leathersich, said months of meticulous planning was carried out ahead of the cut-in. 

“A customised frame was built to support the pipe while we constructed a pump station around it to transfer the wastewater. This frame was also used to lift and remove the section of pipe that was cut,” Mr Leathersich said.

“We used a remote control wire saw to cut the pipe, which removed the need for workers to be in the area while the cut-in took place – this eliminated this safety risk during the work.”

Around 30 per cent of flows from the wastewater treatment plant will be recycled during as part of the scheme. This will allow up to 14 billion litres of water to be recharged each year.

Water Corporation will continue work to construct the scheme with its Alliance partners, which is due to be completed in late 2016.

Key facts

  • Groundwater replenishment is the process where treated wastewater is further treated to drinking water standards and recharged into groundwater supplies.
  • The scheme in Craigie can be expanded to recharge up to 28 billion litres of water each if required.
  • Groundwater replenishment has the potential to supply up to 20 per cent of Perth’s future drinking water needs by 2060.    
  • The Beenyup Wastewater Treatment Plant is the second largest plant in Perth and can treat up to 135 million litres of wastewater each day.
  • Information about the scheme is available at

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