Mairangi Bay Pump Station replacement project

We are building a replacement pump station to reduce wet-weather overflows, creating cleaner beaches and a better environment.

Start-finish: June 2021 - mid-2023
Location: End of Sidmouth Street and Montrose Terrace, Mairangi Bay
Status: Construction

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What’s happening now?

Photo of the Mairangi Bay pump station project

We've brought in the big kit for a big start to the New Year. Our large drilling machine is now on site and underway creating what will be the underground shaft wall. The drilling machine drills down 14-metres, and the hole is then filled with concrete. The machine makes several of these holes on the outside of the circle, creating the shaft wall. The drilling activity will go until approximately the end of February. This means we will be somewhat nosier than usual. Once we complete most of the shaft, we can then start digging the material out from the centre. We will also need to install a new pipeline on Montrose Terrace to improve the network operation into the new pump station. This will take place once we have completed most of the shaft. We will be starting on the architecturally designed pump station structure mid to late 2022. 

A construction timeline for our Mairangi Bay project

Why is it needed?

Sidmouth Street Pump Station receives wastewater from properties between Long Bay and Castor Bay and pumps it via East Coast Road to the Rosedale Wastewater Treatment Plant for treatment. Due to an increase in population and wastewater, the current wastewater pump station is struggling to cope, particularly during heavy rainfall when diluted wastewater can overflow up to 10 times per year, approximately 70 metres out to sea at engineered points on either end of Mairangi Bay.
In 2014, we began a project to look at the best option for a replacement pump station and to work with Auckland Council to integrate planning with the reserve management plan at Mairangi Bay. In 2015, we presented a concept to the public for a replacement pump station. Since then, we have been looking at the best way to integrate the pump station design with the reserve surroundings while minimising environmental impact.

Traffic management

The current road closure will remain in place until we can complete the majority of the underground shaft. When the digging of the shaft doesn’t require as much space, we will change the traffic to a one-way traffic system around the beach side from Sidmouth Street to Montrose Terrace. This will allow us to undertake the pipeline construction on Montrose Terrace. We will inform you once timing of this change is confirmed.

What are the benefits?

The new pump station will include larger pumps and technology to cope with wet weather flows, virtually eliminating overflows. The benefits include:

  • Reduced wastewater overflows and improved beach water quality
  • Cater for population growth in the area
  • Improved open space and integration with the reserve
  • New building architecturally designed to improve the visual appearance of the reserve 
  • New technology to manage and treat odour helping to reduce the total site footprint

Any questions?

If you have any questions about this project please contact:
Jennifer Charteris
Stakeholder engagement advisor
Phone: 021 979 803
Email: [email protected]

Newsletters and more information

Newsletter 2 project update May 2021
Newsletter 1 project overview April 2021
Media release August 2020