Seqwater has taken a significant step forward in delivering South East Queensland’s (SEQ) next major water security project, shortlisting two joint venture consortia to progress the proposed Wyaralong Water Treatment Plant.
Acciona Wyaralong and the Sacyr John Holland Joint Venture have been selected to advance to the next procurement stage. Over the next six months, both groups will work closely with Seqwater to develop detailed solutions for the plant’s design, construction and delivery.
Once complete, the Wyaralong Water Treatment Plant will treat water sourced from Wyaralong Dam and Cedar Grove Weir on the Logan River, supplying up to 120 million litres per day into the SEQ Water Grid — enough for approximately 800,000 people. The facility will also directly support Beaudesert and surrounding communities.
The project forms the final stage of the Beaudesert Water Supply Upgrade and is a critical component of Seqwater’s long-term planning to strengthen the SEQ Water Grid. The additional capacity will help the region better withstand droughts and ensure a more secure, climate-resilient drinking water supply as the state prepares for significant population growth.
The plant’s design includes future expandability to 150 million litres per day, providing long-term flexibility. Water from the facility will connect via the Wyaralong Interconnector Pipeline to the SEQ Water Grid and the South West Pipeline to Beaudesert, reinforcing supply resilience across the broader network.
Procurement for the project is being delivered under Queensland’s “Major Project” framework, with Seqwater applying best practice principles and a Local Benefits Test to maximise opportunities for regional jobs and industry participation. The delivery model will follow a split contract approach: a Design and Construction contract running in parallel with an Operations and Maintenance contract, enabling a seamless transition to long-term operation. Construction is expected to begin in mid-2027, with operations commencing in 2031.
With SEQ’s population forecast to grow by more than one million people over the next two decades, the Wyaralong Water Treatment Plant represents a vital investment in future-proofing the region’s most essential service.
