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St Marys Bay area water quality improvement project

We are installing a pumping and screening station, as well as a new pipeline, to reduce combined wastewater and stormwater overflows and increase swimmable days at St Marys Bay and Masefield Beach.

Improvements of the stormwater system


The $37.8m project in St Marys Bay area is part of the Western Isthmus Water Quality Improvement Programme to clean up the Waitematā Harbour.

The work will:

  • significantly reduce combined wastewater and stormwater discharges into St Marys Bay and Masefield Beach
  • improve water quality at these beaches making it safer for swimming, sailing and paddling
  • improve the environment for people, birds and marine life
  • help us better manage increasing demands on the system as our population grows.

How we'll do this

A new 2km long pipe will store combined stormwater and wastewater that would otherwise flow into St Marys Bay and Masefield Beach.


The project also includes:

  • open trench construction at Curran and Sarsfield streets
  • construction of three large shafts at London and New streets, St Marys Road Park and Pt Erin
  • an underground pipeline from London and New streets via Pt Erin to a new harbour outfall
  • construction of a pumping and screening station at Pt Erin.

Construction will begin in January 2020 and is expected to be finished in late 2021.


Noise and traffic disruption

We will try to minimise any noise or traffic disruption.

A traffic management plan will be in place to ensure minimal disruption to residents, as well as the safety of drivers, pedestrians and site workers.

Lane restrictions will be in place on Curran Street, however two lanes will be kept open during peak hours to ensure motorway access.

Sarsfield Street will be temporarily restricted to one lane at times due to trench work.

Allow extra travel time and consider alternative routes wherever possible during construction.

Working hours will be Monday to Saturday, from 7.30am to 6pm.

We will give you advance notice if access to your property is affected or work outside working hours is needed.

Other work in your area

The St Marys Bay pipeline is the first part of an integrated group of wastewater and stormwater upgrades that will be delivered over the next eight years by Auckland Council and Watercare.

For the St Marys Bay and Herne Bay catchments, the remainder of the work involves Watercare separating stormwater and wastewater into separate pipes and renewing a century-old wastewater sewer.

The first part of this work gets underway in early 2020 with the rebuild of a critical junction at Hackett Street.

Further information

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