Central Interceptor

Under Delivery
Central Interceptor

The Central Interceptor is an expansion to the existing Auckland Wastewater network, aiming to increase capacity and reduce overflow. 

The project scope includes: 

  • Construction of a 14.7 km long tunnel with a 4.5 m internal diameter, 
  • Two 3.2 km long sewers, at a maximum depth of 70 m,
  • Multiple drop shafts and access shafts, 
  • Expanding existing connecting sewers, chambers, control facilities and air treatment facilities, and
  • Construction of a wastewater pumping station

The project is being delivered through a Ghella Abergeldie Joint Venture.

Key Dates

Jul 2019 Construction Commencement
Dec 2025 Expected Construction Completion

Funding contributions

User charges


Successful Tenderer: Ghella Abergeldie Joint Venture (GAJV) was appointed in early 2019 as the Main Contractor by Watercare


May 2018 RFP's opened for the Central Interceptor
Sep 2018 Tenders were submitted for the project by four short-listed contractors.
Nov 2018 AGJV were announced as the preferred bidder for the porject.
Mar 2019 Watercare and AGJV formally signed the contract to deliver the Central Interceptor
Aug 2019 Construction commenced on the Māngere Pump Station
Estimated Total Cost
Water & Sewerage
Procurement approach
Traditional Procurement |
New Zealand |
Project website
Central Interceptor