Whenuapai and Redhills wastewater project

Project overview

The project involves new wastewater infrastructure to service growth in the northwest future urban zones. The main project works will take place in the Whenuapai and Redhills areas, and along SH18.

The proposal

• Gravity pipelines in southern Redhills

• A new pump station, rising main and gravity pipeline located in Whenuapai

• Two rising main diversions in Whenuapai

• A new tunnel from Westgate to Hobsonville. The new wastewater tunnel will be constructed using micro-tunnel boring and will be at a depth of approximately 20 meters underground

Timeline

Package 1: Dates to be confirmed

Package 2: Dates to be confirmed

Package 3: Late November 2024 - mid 2026

Project map

Current works

Update about Package 3 – Pipeline B works

Our pipeline B works started in early September 2025.

In some good news, the pipeline for our package 3 – pipeline B works have now been completed.

We are just reinstating the farm fencing around our package 3 pipeline B works. We estimate these works will be completed in the next two weeks.

Once the pipeline B works including reinstatement are completed, there are some additional connection works to redirect flows to the new pipeline. Once these works are complete, the current temporary wastewater tankering solution will stop.

Package 3 – pipeline A and pipeline D works

We have finished laying the new wastewater pipes A and D.