Alkimos seawater desalination plant investigations

Artists impression of future Alkimos Seawater Desalination Plant

As part of our long term planning to secure Perth’s water supply, we have completed feasibility investigations and have commenced environmental approvals for a seawater desalination plant at Alkimos. The Alkimos Seawater Desalination Plant is one of a number of water source options being considered, with a decision on when a new source may be needed for Perth dependent on a range of factors, including population growth, climate and demand.

What we investigated?

  • A seawater desalination plant with capacity to treat 25 billion litres of seawater per year, with a possible future expansion
  • Two new ocean pipelines, below the seabed, that bring seawater into and take brine (salty water) away from the plant
  • A water transfer pipeline to take water from Alkimos to Wanneroo, where the water will be connected to Perth’s water supply
  • Understanding environmental impacts
  • Working with the community to understand its needs.

We are also investigating a co-located groundwater treatment plant to be incorporated within the Alkimos Water Precinct.

You can read more about the investigations here.

Working with the community

We invited members of the Alkimos and surrounds community to be a part of our investigations. You can read more about our conversations with community here .

We also met with dozens of stakeholders, with feedback received reflected in our investigations.

We will continue to keep the community and stakeholders updated as we progress our planning.

Protecting the marine environment

Extensive research has been conducted to ensure the offshore pipelines required to bring seawater in and take brine away from the plant are located and constructed with the least possible environmental impact.

You can read more about how we are planning to protect the marine environment here.

Impacts on the local community

A priority of our investigations is minimising disturbance to surround homes and businesses during plant construction and operations. You can read more about how we have designed the plant to reduce noise and screened it from homes here.

Pipeline to Wanneroo Reservoir

Water from the plant will join Perth’s water supply through a 35km pipeline. You can read more about the pipeline here.

Have your say and register to stay updated

You can have provide feedback on the proposed plant or register to keep updated by emailing community.engagement@watercorporation.com.au

By registering your details, you can stay informed and continue to input feedback as we progress in the approval process.

As part of our long term planning to secure Perth’s water supply, we have completed feasibility investigations and have commenced environmental approvals for a seawater desalination plant at Alkimos. The Alkimos Seawater Desalination Plant is one of a number of water source options being considered, with a decision on when a new source may be needed for Perth dependent on a range of factors, including population growth, climate and demand.

What we investigated?

  • A seawater desalination plant with capacity to treat 25 billion litres of seawater per year, with a possible future expansion
  • Two new ocean pipelines, below the seabed, that bring seawater into and take brine (salty water) away from the plant
  • A water transfer pipeline to take water from Alkimos to Wanneroo, where the water will be connected to Perth’s water supply
  • Understanding environmental impacts
  • Working with the community to understand its needs.

We are also investigating a co-located groundwater treatment plant to be incorporated within the Alkimos Water Precinct.

You can read more about the investigations here.

Working with the community

We invited members of the Alkimos and surrounds community to be a part of our investigations. You can read more about our conversations with community here .

We also met with dozens of stakeholders, with feedback received reflected in our investigations.

We will continue to keep the community and stakeholders updated as we progress our planning.

Protecting the marine environment

Extensive research has been conducted to ensure the offshore pipelines required to bring seawater in and take brine away from the plant are located and constructed with the least possible environmental impact.

You can read more about how we are planning to protect the marine environment here.

Impacts on the local community

A priority of our investigations is minimising disturbance to surround homes and businesses during plant construction and operations. You can read more about how we have designed the plant to reduce noise and screened it from homes here.

Pipeline to Wanneroo Reservoir

Water from the plant will join Perth’s water supply through a 35km pipeline. You can read more about the pipeline here.

Have your say and register to stay updated

You can have provide feedback on the proposed plant or register to keep updated by emailing community.engagement@watercorporation.com.au

By registering your details, you can stay informed and continue to input feedback as we progress in the approval process.

  • Project update- 9 November 2018

    CLOSED: This discussion has concluded.

    Residents and visitors to Alkimos Beach may notice a large offshore drilling barge as it mobilises to the area on November 12 .

    The barge will drill small core sample holes to collect information on the seafloor and geology beneath the sea bed. This information is important to selecting the most appropriate location of and construction method of offshore parts of the potential plant.

    The barge is expected to be in the area off the Alkimos coast until late December. Work will be completed seven days a week (weather depending).

    Vessels are advised to maintain a safe distance of no less than 25 metres from the drilling rig. A marine exclusion zone will be in place during the work. A map of the work area and further information is available here.

    Access to Alkimos Beach for fishing, swimming or recreating will not be impacted. A seismic survey of the area is planned to be complete by mid-November.

    We thank the Alkimos community and fishers in the area for your patience while we complete this important work.
  • Project update- 17 October 2018

    CLOSED: This discussion has concluded.

    A marine exclusion zone will remain off the coast off Alkimos until the end of October while seismic surveys are completed.

    The work, which started in late September, has involved specialised vessels transiting the area to collect information about the seabed, which is being collected as part of investigations underway in relation to a possible future Alkimos seawater desalination plant.

    Weather delays have affected the completion of the work.

    Once the survey is complete, a core sample drilling program will begin. A large offshore drilling rig might be seen from the coastline. This work is planned to take about five weeks from early / mid-November. An exclusion zone will be in place for the area surrounding the rig, delineated by four yellow buoys.

    Water Corporation appreciates the patience of the community, including boaters and fishers, while we complete the work.


  • Marine exclusion zone as surveys begin off Alkimos coast

    CLOSED: This discussion has concluded.

    A temporary marine exclusion zone will be in place off the Alkimos coast from 17 September, 2018 for up to three months while we complete a seismic survey and core sample drilling as part of our feasibility investigations.

    The surveys will help us understand the subsea geology and where and how the intake and outfall pipelines for the potential future seawater desalination plant may be located and installed.

    The seismic survey, which will be completed by a specially equipped vessel, will be completed first, followed by the core sample drilling, which will be completed using a jack up barge. Once the seismic survey is complete the temporary exclusion zone will be limited to within 25m of the rig and be identified by buoys equipped with flashing yellow lights.

    Recreational fishers and boaters are reminded to please stay clear of the exclusion zone and ensure all fishing equipment is removed by 16 September to prevent it being damaged. Beach access will not be affected by the work and the rig may be visible from the shoreline.

    For more information, coordinates and a map of the exclusion zone please click here.

  • Meet the Team: Alkimos Information Showcase – August 19

    CLOSED: This discussion has concluded.

    We will be joining Lendlease and other government departments and agencies at the Alkimos Information Showcase event on Sunday, August 19 from 11am to 2pm. Come visit the Water Corporation stall to learn about our plans for Alkimos or for some great waterwise information and tips.

    You can also call us anytime by contacting Community Engagement Senior Advisor Tarryn Truscott via email to community.engagement@watercorporation.com.au or phoning 9420 3488.
  • Project Update - June 2018

    CLOSED: This discussion has concluded.

    Possible future Alkimos Seawater Desalination Plant Project Update June 2018

    Public comment opens: offshore investigations

    We are planning on completing a seismic survey and core sample drilling to help us understand the offshore geology and where and how the intake and outfall pipelines for the potential plant may be located and installed. During this work, which will involve vessels with specialised equipment and a jack up barge, marine exclusion zones will be in place to ensure the safety of workers and the community.

    We have submitted for the environmental approvals necessary for this work. As part of this approval a public comment period is open until 5 July, 2018. To find out more about this work you can read an information sheet here. To read our approvals documentation or to submit a public comment visit http://epbcnotices.environment.gov.au/invitations/ (Reference: 2018/8224)

    Meet the Team: Community conversations at the Sprout Hub

    Members of the investigations team will be at the Sprout Hub café (at Bristlebird Park Providence Drive & Sanderling Street, Alkimos) for informal conversations and a chance to learn more about the feasibility studies.

    Our next sessions will be Thursday, June 28 from 9.30am to 11.30am and Tuesday, July 10 from 1.30pm to 3.30pm You can also call us anytime by contacting Community Engagement Senior Advisor Tarryn Truscott via email to community.engagement@watercorporation.com.au or phoning 9420 3488.

    In the News

    The investigations recently featured in this news article: Public feedback sought on potential Alkimos desalination plant (Source: North Coast Times, 25/5/2018).

    You can also read about how Perth’s desalination plants have contributed to our water supply at http://www.abc.net.au/news/2018-06-21/how-perth-dodged-its-own-water-crisis-like-day-zero-in-cape-town/9891472 (Source: ABC)
Page last updated: 06 December 2021, 08:51