Skip to main content

Water Infrastructure

Enhancing Rottnest Island with vital infrastructure upgrades to overhaul the ageing water production and supply network.

Overview

The Water Infrastructure upgrade addresses the critical need for a robust water supply network that can adequately support the increasing demands of both tourists and island businesses in peak visitation periods.

The project aims to revamp the island’s outdated system, including the desalination plant, water mains and distribution network and essential services corridor. This strategic upgrade is vital for meeting both current and future water demands as well as enhancing firefighting capabilities.

This project is a key priority of the Rottnest Island Management Plan 2023-28, which includes a strategic focus on strengthening the island’s infrastructure to address legacy issues and ensure the island can sustainably meet future demand.

Key benefits

Water production will be enhanced to meet the needs of visitors and residents
Upgrade of the desalination plant and water mains to handle current and future demands
Increased service pressures and reductions of water leaks with a new robust supply network
Improved capabilities for firefighting
New essential services corridor

Location

Frequently asked questions

The desalination plant and water network require substantial upgrades to continue providing adequate water services for visitors, residents, and island businesses.

The project has two key components:

  • Desalination Plant Upgrade: Installation of a new 1,000 m³/day modular desalination plant (expandable to 1,500 m³/day) to replace the aging production system meet forecast water demands.
  • Water Distribution Network Upgrade: Partial replacement of the island’s aging water network with new pipes and pumps, including creation of a ring main system.

Construction of the desalination plant commenced in February 2026 and is expected to be completed by the end of 2026. Works on the water distribution network upgrade are scheduled to commence later in 2026.

The Northern Service Corridor is an alignment of buried infrastructure that includes water, communications and power.
Water and power infrastructure works optimally when reticulated in loops, as this provides electrical and hydraulic redundancy. The northern service corridor will complete the northern arm of the ‘ring main’.
The location was determined following extensive consultation with stakeholders across several years. The main factors affecting the choice of location were protection of environmental and cultural heritage, as well as constructability and engineering viability.
Construction works are projected to take up to four months to complete, commencing in June 2026 and concluding in September 2026.

Contact and further information

You can reach us on the following details to find out more about these projects. Our contact lines are open Monday to Friday, 8:30 am to 5 pm, excluding public holidays.

Funding

This project has been made possible by funding from the State Government of Western Australia.
Status
Current
Funding
This project has been made possible by funding from the State Government of Western Australia.