Central Interceptor
The largest wastewater project in New Zealand, our super-sized tunnel will run for 16.2kms under Auckland city and the Manukau Harbour. Find out what it’s all about and how we’re tracking.
Duration
2019-2026
Location
Grey Lynn to Māngere
Status
Construction
Ground-breaking benefits for Tāmaki Makaurau
Since 2019 we’ve been busy constructing New Zealand's largest wastewater tunnel to manage our central city’s wastewater, called the Central Interceptor (or ‘CI’).
It’s all about everyone enjoying clean waterways and beaches and greener open spaces, across the central city.
It’s all about everyone enjoying clean waterways and beaches and greener open spaces, across the central city.
Right now, in older parts of the city, wastewater and stormwater flow into a combined network of pipes.
When it rains heavily, stormwater often overwhelms the ageing system, resulting in wastewater overflows into our creeks and streams.
The CI tunnel will significantly reduce overflows in the central Auckland area.