Watercare has begun an extensive upgrade to Auckland's wastewater system with the implementation of a Central Interceptor system. It is a 4 meter diameter pipe which will run from Grey Lynn via Western Springs and Mt Albert to the Mangere wastewater Treatment Plant. It is designed to reduce major harbour overflows including the Meola and Cox’s Creek systems and is expected to be operational by 2026.
The Central Interceptor will eventually be used for only wastewater. So additionally work is commencing to remove stormwater from the combined system incrementally long term. This is starting with separation in Freeman’s Bay, St Marys Bay and Herne Bay. Separation in Herne Bay is expected to be completed by 2025.
A consultation group has been set up to oversee these plans. HBRAI is represented in this group.
You can find out more about the Central Interceptor project
by watching this video on the link here
by visiting for Watercare's information or visiting the Council's site at
Click here to read the Water Quality Improvement Project agreement for Masefield St Marys Bay.
Below are images of the work and signage currently in St Marys Bay and at the foot of Pt Erin.