Better water, brighter future
Raglanâs upgraded wastewater plant delivers high-quality treated wai (water) while respecting cultural and environmental values.
The original plant, based on oxidation pond technology, had reached the end of its effective service life. To address performance and compliance issues, Waikato District Council (WDC) in partnership with Waikato Watercare, initiated a major infrastructure upgrade of the plant.Â
After seven years of consultation with the community and mana whenua, construction began in January 2024.
The treatment plant took a big step forward in August 2025 with the opening of a state-of-the-art upgrade to the townâs treatment plant at Te-Rua-O-Te-Ata. Blessed by mana whenua, the new facility promises cleaner water, stronger environmental safeguards, and greater resilience for the future.
The plant uses industry-leading technology to produce treated wastewater close to drinking quality, with advanced nitrogen and pathogen removal and final ultraviolet disinfection. Capable of treating up to 6000 cubic metres per day, it ensures Raglanâs wastewater is managed safely and sustainably, even during peak holiday periods when the townâs population surges.
The old oxidation ponds continue to provide storm buffering capacity, ensuring the system remains resilient and continues operating effectively during extreme weather.Â
For iwi, the upgrade has deep cultural importance. Te-Rua-O-Te-Ata was once the domain of Te Atai o Rongo, taniwha and kaitiaki of the local Tainui people, whose lair was disrupted when oxidation ponds were built in 1977. Local iwi strongly opposed the site at the time, raising concerns about wÄhi tapu, nearby marae, and the health of traditional kaimoana beds.
In the future, WDC plans to shift Raglanâs treated wastewater from the harbour to land, with a preferred option now identified. The move aims to protect WhÄingaroa Harbour and reflect the communityâs and mana whenuaâs vision for a more sustainable future. The proposal includes upgrading the treatment plant and using subsurface drip irrigation to safely filter treated water back into the land.