Alkimos to Wanneroo desalination pipeline

In accordance with the Local Government Act 1995, City of Wanneroo advises Water Corporation, in partnership with Alkimos Pipeline Alliance, will be constructing a 33.5km major belowground water pipeline from the new Alkimos Desalination Plant to Wanneroo Reservoir from July 2025 to October 2027.

The pipeline will be the largest water pipeline Water Corporation has constructed, with a diameter of up to 1600mm, delivering up to 50 billion litres of drinking water annually to Perth's Integrated Water Supply Scheme and securing long-term water sustainability for the region.

Approximately 6km of pipeline has already been installed from the Alkimos plant to the corner of Wanneroo and Romeo Roads in Carabooda.

Works will pass through Carabooda to the Carabooda Tank, before heading south-east through Nowergup, Neerabup and along the outskirts of Banksia Grove, Mariginiup and Jandabup before reaching the Wanneroo Reservoir.

This alignment was determined in consultation with local stakeholders including the City of Wanneroo, Main Roads WA, Department of Planning, Lands and Heritage, and Whadjuk Aboriginal Corporation. Construction projects of this scale will cause disruption, but this alignment is considered to minimise impacts to the environment, residents, businesses and road users.

To ensure safety for the community and work crews, traffic management measures and temporary road closures possibly exceeding 28 days will be implemented progressively at various stages throughout the construction period. The following roads will be directly impacted:

• Orchid Road: Closure with detour via Wesco Road from end of July 2025 to April 2026.
• Wesco Road: Lane restrictions and speed reductions during work hours from April 2026.
• Adams Road: Closure with detour via Neaves Road from end of July to January 2026.
• Mariginiup Road: Lane restrictions with temporary sidetracks from end of July 2025 to mid-May 2026.

Access and safety

• Access to properties will be maintained throughout the works. Where direct access is temporarily restricted, alternate routes or traffic controller support will be provided.
• Weekly rubbish collections will continue as normal. Should alternate bin placements be required residents will be directly advised.
• Placement of Variable Message Boards (VMBs) to inform motorists of changed road conditions.
• Spotters and traffic controllers will assist local traffic and residents.
• Emergency services will always have access.
• After-hours closures will be clearly marked and monitored for public safety.

Stay informed

Residents and road users are encouraged to stay informed by visiting the project webpage for detailed updates: watercorporation.com.au/alkimostowanneroo

Submissions on these proposed closures can be made in writing to the Chief Executive Officer by 5:00 PM Friday, 18 July 2025 via post to Locked Bag 1, Wanneroo WA 6946, or email: assetplanningmailbox@wanneroo.wa.gov.au.

Enquiries and further information

Name: Alkimos Pipeline Alliance Community Manager
Telephone: 08 9200 2303
Email: community@apalliance.com.au