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Hinonga whakapai ake i te kounga wai o te rohe o St Marys Bay

St Marys Bay area water quality improvement project

We have installed 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've done this

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



Further information

If you have questions, email