Central Interceptor

A super-sized wastewater tunnel that will reduce overflows

Construction of the Central Interceptor is well underway

Over the next four years we’re building the Central Interceptor tunnel to help make Auckland's waterways cleaner. The Central Interceptor will run underground from Grey Lynn to our Māngere Wastewater Treatment Plant. It will have several link sewers and shafts along the route for collecting and transferring wastewater into the tunnel.

Our contractor Ghella Abergeldie Joint Venture (GA) is building the Central Interceptor. GA has more than 150 years’ experience with tunnelling and wastewater projects of this size across the globe.

Once completed, the tunnel will be 14.7 kilometes in length, the longest bored wastewater tunnel in New Zealand. At 4.5 metres in diametre, it will be high enough to fit a giraffe and wide enough to fit four rhino side by side.

To find out more about the project, click here to watch our video and see how the Central Interceptor will make Auckland a better place to live.
Benefits to you

Benefits to you

Find out how the Central Interceptor will benefit your community. 
Staff check the equipment at a water treatment plant

Community events

Information about our community days and education programme 
Consent Documents

Consent Documents

All the consent documents associated with the project. 

FAQs

Our answers to frequently asked questions associated with the project. 

Key facts

All the facts and figures about the Central Interceptor project. 

Meet the team

Get to know the people who are working on New Zealand's longest tunnel. 

News

All the latest news, newsletters and media clippings about the project. 

Our sites

Find out what's happening at our sites across Auckland. 

Progress in pictures

A picture gallery of the project as it takes shape. 
Central Interceptor crew member pulls on a pair of overalls

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Pulling on a pair of orange overalls never felt so good. Our underground crew arrived at Māngere Pump Station this morning (Wednesday 22 September) ready to get stuck in. First up for this bubble were temperature checks before they arrived on site, then each crew member received a pair of overalls to put over their work gear. Those overalls will be disinfected at the end of each day so they are clean and ready for the next day of level 3. Our once small alert level 4 whānau has grown under level 3, meaning the work will be amped up but strict COVID protocols remain in place including socially distanced morning exercise routines.