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Moa Point Wastewater Treatment Plant

At the Moa Point Treatment Plant, sewage travels through a series of screens, tanks, bioreactors, clarifiers and ultraviolet treatments before being discharged as liquid into Cook Strait.

It was granted new consents on 11 May 2009. These consents will continue for 25 years (expire 11 May 2034).

In general, the consents allow WCC:

  • to continuously discharge up to 260,000 cubic meters per day of treated and disinfected wastewater into the coastal marine area via an existing submarine outfall,
  • to discharge up to 4500 litres per second of mixed disinfected, treated and milli-screened wastewater to the coastal marine area during and/or immediately after heavy rainfall, when the quantity of wastewater arriving at the Moa Point Wastewater Treatment Plant exceeds 3000 litres per second,
  • to occupy the foreshore and seabed of the coastal marine area with an existing submarine outfall pipeline,
  • to continuously discharge contaminants (including odour) to air from the Moa Point Wastewater Treatment Plant ventilation system.

Resource consents

Resource consent reports

Plant performance

Current Status:
Period: February 2024


The plant remains non-compliant for suspended solids (90-day, 90th percentile limit) since 20 September and for faecal coliforms since 30 October (90-day, 90th percentile limit). Process changes to bring effluent back into compliance are being undertaken, however, mechanical failures at the plant are impacting a return to compliance. 


No discharges in February.

Please Explain letter response: 

A response to the Please Explain letter for the conspicuous change in water colour issue, observed in Tarakena Bay on 23rd January, was submitted to GWRC within the required timeframe.  


No odour complaints in December.

Items of significance:

Community Liaison Group (CLG) Meeting

The annual CLG to report to the community on plant performance and consent compliance took place as planned on 29 February. The meeting minutes will be available on the Wellington Water website in March for public perusal.

Clarifier #2 Renewal Project

Work to replace the main bearing and renew structural elements on the second clarifier began mid-January. With only 2 of the 3 clarifiers operating during this work, processing capacity is reduced. Work is being carried out over the summer/autumn months when effluent flows are expected to be lower. Deep cleaning of the clarifier prior to inspection has progressed well in February and the inspection is scheduled for mid-March.

Inlet Pump Station (IPS) Project

The next stage of the IPS upgrade is on schedule, with physical works set to start late March.

Public meeting resources