Central Interceptor

Cleaner Waterways and Beaches

Fifteen meters beneath the bed of Manukau Harbor, in the oldest areas of downtown Auckland, the City of Sails, will run the Central Interceptor, the longest wastewater tunnel in the country's history.

New Zealand

2019 | ONGOING

Watercare’s 14.7 km long wastewater tunnel will be the longest bored tunnel in New Zealand. In older parts of Auckland, there is a combined sewage/rainwater network. During heavy rain, the system becomes overwhelmed, and overflows occur into local streams and beaches. The Central Interceptor tunnel will capture the combined flows and convey them to Māngere Wastewater Treatment Plant for processing. The Central Interceptor project will reduce around 80 per cent of these wetweather overflows and will improve the water quality of local waterways. The tunnel will be 4.5 m in diameter and will start in Grey Lynn and run underneath the Manukau Harbour to central Auckland to depths of between 15m and 100m below the surface.

Benefits

1. Reduction of wastewater overflows into local streams and beaches
2. Cleaner waterways and beaches
3. Improved network capacity to serve the expanding city of Auckland for the next 100 years

Cleaner Waterways and Beaches Fifteen meters beneath the bed of Manukau Harbor, in the oldest areas of downtown Auckland, the City of Sails, will run the Central Interceptor, the longest wastewater tunnel in the country's history. New Zealand

Cleaner Waterways and Beaches

Fifteen meters beneath the bed of Manukau Harbor, in the oldest areas of downtown Auckland, the City of Sails, will run the Central Interceptor, the longest wastewater tunnel in the country's history.

New Zealand