Securing Perth's water supply

We have a long term plan in place to secure our water future for generations to come.

Have your say on Perth's possible future desalination plants

We're inviting customers to join our online community to learn more and share your feedback about our investigations underway to determine the feasibility of new desalination plants to secure Perth's water supply.


We first released our 50-year plan to secure Perth's water supply in 2009, in response to the early signs of a drying climate and with extensive consultation with the community. We followed this with a second 10-year plan in 2011.

Since the 1970's rainfall has reduced by around 19% but streamflow to dams has declined much more dramatically. Over the last decade, we have introduced new climate independent sources of water - seawater desalination and groundwater replenishment - to help secure supplies.

By 2030, providing our water use reduction and recycling targets are met, we expect a further 70 to 100 gigalitres of additional climate independent water will be required to support Perth's water needs.

Our plans to secure Perth's water supply into the future include:

  • continuing to help Perth households and businesses use even less water and make greater use of recycled water
  • expanding our Groundwater Replenishment Scheme and investigating further opportunity for reuse of treated wastewater
  • increasing the capacity of our existing desalination plants
  • expanding our deep groundwater network
  • investigating new desalination plants at Kwinana and Alkimos.