Northern Interceptor

Built in stages, this pipe will redirect wastewater from the north-west to the Rosedale Wastewater Treatment Plant.

Start–finish: 2017 to 2035

Phase 1
Location: Hobsonville to Rosedale
Status: Design and construction 2017–2020

Construction for Phase 1 began in January 2019. This is combined with the watermain improvement works across the upper Waitematā Harbour.

Future phases

2020–2030: Future works 
We have the ability to expand on these works to meet the expected future needs of a growing Auckland and will do so over time, as required. 

What’s happening?

As the north-west of Auckland expands, so does the amount of wastewater we collect and treat. The Northern Interceptor is a new wastewater pipeline that will be built in stages, depending on how fast the population grows. 

Currently, wastewater from Massey North, Whenuapai, Hobsonville, Kumeu, Huapai and Riverhead flows to the Māngere Wastewater Treatment Plant.

The new pipe will redirect this flow to the nearby Rosedale Wastewater Treatment Plant in Albany.

Greenhithe Road traffic management

In mid-to-late June 2019, we will start trenching over Tauhinu Road towards Greenhithe Road. A one-way traffic system will be established along Greenhithe Road as works progress. Stop-go traffic management will be in place during the day, with temporary traffic lights in operation at night.

There will be no street parking adjacent to the work site. Working hours will typically be from 7am to 6pm, Monday to Friday, and from 8am to 5pm on Saturdays.
We aim to complete the pipe installation up to Collins Park by late 2019. We will then progress further along Greenhithe Road and aim to be completed by Wainoni Park around March 2020.
Businesses will remain open during this time, and traffic management personnel will assist people with access to their properties.

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What are the benefits?

  • The new pipeline will free up the Māngere treatment plant to cater for future growth.
  • The Rosedale Wastewater Treatment Plant has the capacity to manage the anticipated growth in the northern area up until 2070.

Any questions?

Please contact us:
Phone: (09) 442 2222 

More information 

Newsletter (Winter 2019)
Northern Interceptor route map
Newsletter (March 2016)
Requirement and designation process: a guide

Application documents, including decision and conditions

Combined assessment of alternatives - final for consent
Consent drawings
GBWD and causeway - Volume 1 - AEE
Greenhithe Bridge Northern Interceptor conditions s133A 10 Feb (1)
Greenhithe Bridge Watermain and Northern Interceptor - decisions final (1)
NH2 Stage 5a causeway earthworks combined drawings (1)
Technical Report A - Earthworks, erosion and sediment generation - final
Technical Report B - Soil, sediment and groundwater contamination - final
Technical Report C - Groundwater - final
Technical Report D - Ecological assessment  - final
Technical Report E - Arboricultural assessment - final
Technical Report F - Traffic assessment - final
Technical Report G - Construction noise and vibration - final
Technical Report H - Coastal process report - final (1)
Technical Report I - Landscape and visual assessment - final (1)
Technilcal Report J - Heritage impact assessment - final