The technology used in the upgraded Te Kauwhata (2024) and Raglan (2025) wastewater treatment plants has placed Waikato District Council at the forefront of global water innovation because of the near drinking standard of the discharge.
In partnership with Waikato Watercare, the council has delivered the Southern Hemisphere’s first dual Membrane Aerated Biofilm (MABR) and Membrane Bioreactor (MBR) powered plants, resulting in safe, energy efficient and scalable discharge that meets long-term catchment planning.
Oxidation ponds are used to provide storm buffering capacity, ensuring the system remains resilient and operational during climate events.
The technology has been featured in 1 News coverage alongside the Water New Zealand Conference in Ootautahi Christchurch, and in the UK publication Global Water Intelligence, showcasing the upgrades as international case studies in innovation, modular design and efficiency.
This recognition reflects Waikato District Council’s commitment to:
• Delivering best in class wastewater quality for our communities and environment
• Investing in future-proofed, scalable infrastructure that reduces the need for short-term and costly upgrades
• Contributing to global dialogue on climate resistant and environmentally sustainable water solutions
“We are proud to see Waikato District Council’s investment in innovation recognised nationally and internationally,” says Megan May, General Manager Assets and Infrastructure. “These projects show what is possible when we prioritise technology that delivers for both our environment and our communities: cleaner wastewater, scalability for growth, and climate resilience for generations to come.”
A huge mihi to everyone involved, from the teams on the ground to the engineers, project managers, iwi partners, community engagement and suppliers who helped deliver these assets. Together, we are setting a new standard for what local government innovation and collaboration can look like.
This leadership creates a strong foundation for the future. Waikato District and Hamilton City Council have formed a publicly owned, Council-Controlled Organisation to deliver water services for Hamilton and Waikato communities. From 1 July 2026, IAWAI – Flowing Waters will be fully operational and responsible for managing 91,000 drinking water and wastewater connections across our fast-growing district.
The successful delivery of Raglan and Te Kauwhata’s plants ensures that Waikato district’s water network is being handed over in excellent shape; modern, efficient and future-proofed.
