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.

Walkway closure to Wainoni Park

The construction of the Northern Interceptor wastewater pipeline progresses through Wainoni Park. The pedestrian walkway from Te Wharau Drive to Wainoni Park will be temporarily closed for approximately three months for public safety reasons. Please follow alternative routes provided on the map below. For more information email NIproject@water.co.nz or phone Claire Donnelly, stakeholder manager, The Fletcher Construction Company Limited on 021 607774.

Alternative routes through Wainoni Park

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: NIProject@water.co.nz

More information 

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

Application documents, including decision and conditions

Northern Interceptor Phase 1 decision with conditions
Requirement for designations
Assessment of effects on environment (AEE)
Appendix A
Appendix B
Appendix C
Appendix D
Appendix E
Appendix F
Appendix G
NI Vol 2 Technical Report A
NI Vol 2 Technical Report B
NI Vol 2 Technical Report C
NI Vol 2 Technical Report D
NI Vol 2 Technical Report E
NI Vol 2 Technical Report F
NI Vol 2 Technical Report F (supplement)
NI Vol 2 Technical Report G
NI Vol 2 Technical Report H
NI Vol 3 Drawing Set