Northern Interceptor

This pipe will redirect wastewater from the north-west to the Rosedale Wastewater Treatment Plant.

Phase 1: 2019–2020
Status: Construction

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

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. Future stages of the pipe will be constructed depending on population growth in the area.
auckland wastewater and water network map

Hobsonville Pump Station

  • Migration between the old system to the new system has commenced and is due to be completed in May/June 2022.
  • Final surfacing of new layout inside pumpstation, including new electric gate and reinstatement of green areas, due to be completed by late May 2022.

Alexander Creek pipe bridge (Rosedale Park)

  • Permanent piling and pile caps have been poured.
  • Carrier pipe for pipe bridge was lifted into place mid-February 2022 in three stages.
  • Product pipes installation and removal of staging due to commence in late March 2022.
  • Testing of product pipe and install of fibre optic cable to take place in mid-June 2022.
  • Removal of temporary solider wall and reinstatement to commence in mid to late June/early July 2022.

Rosedale park soft ball carpark area

  • Install of scour chamber at gully beside frisbee park temporary compound has commenced.
  • Piping across the carpark to start and be completed in late March 2022.
  • Air valve at end of carpark to be constructed in April 2022.
  • Connection of pipeline between AV and pipe bridge product pipe to commence in mid-June 2022.
  • Surfacing and green area reinstatement to commence in mid to late June/early July 2022.

Works have been completed in the following areas:

  • New Causeway at end of Squadron Drive, Hobsonville
  • Rahui Reserve
  • Greenhithe Road
  • Wainoni Reserve
  • RDA Wainoni
  • North Shore Memorial Park
  • Schnapper rock Rd, Newbury Place, Witton place
  • Pipe bridge at Laurel Oak Drive
  • North Shore Golf Course
  • Appleby Road
  • Crossing Albany highway
  • John Glenn to Piermark Drive
  • Bush Road to the RV Centre

Horizontal directional drilling at the Causeway

Using advanced tunneling technology we've successfully completed our drilling from the Causeway under the harbour to Rahui Road reserve and installed a new wastewater pipe under Waitematā Harbour. To get an idea of the scale of the work, press play on the video.

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 
Email: [email protected]

More information 

Northern Interceptor project area updates (June 2020)
The Horizontal Directional Drilling (HDD) process
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)
Technical Report J - Heritage impact assessment - final

Northern Interceptor AEE

Technical Report A - Assessment of noise effects - final
Technical Report B - Construction vibration assessment - final
Technical Report C - Assessment of arboricultural effects - final
Technical Report D - Archaeological assessment - final
Technical Report E - Coastal processes report - final
Technical Report F - Assessment of landscape and visual effects - final
Technical Report G - Construction traffic assessment - final
Technical Report H - Ground contamination assessment - final
Technical Report I - Ecological assessment - final
Technical Report J - Groundwater and settlement assessment - final