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
WGN080003 [26182] Land Occupation by Outfall Pipe (Moa Point WWTP)
WGN080003 [26183] Contaminants Discharge to Air WWTP (Moa Point WWTP)
WGN080003 [31505] Discharge of Treated Wastewater to Coastal Marine Area (Moa Point WWTP)
WGN080003 [35047] Discharge of Partially Treated Wastewater to Coastal Marine Area (Moa Point WWTP)
WGN960094 [1471] Contaminants Discharge to Air IPS (Moa Point WWTP)
Resource consent reports
Annual Reports:
Moa Point Wastewater Treatment Plant Annual Resource Consents 2020/2021
Moa Point Wastewater Treatment Plant Annual Resource Consents 2019/2020
Careys Gully Southern Landfill Annual Resource Consents Report 2021/2022
Moa Point Wastewater Treatment Plant Annual Resource Consents Report 2021/2022
Moa Point Wastewater Treatment Plant January March 2023 Quarterly Resource Consents Report
Moa Point Wastewater Treatment Plant FY2022 23 Annual Resource Consents Report 1
Moa Point Wastewater Treatment Plant, GWRC Compliance Monitoring Report 2022 - 2023
Plant performance
Current Status: Non-compliant
Period: February 2024
Commentary:
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.
Discharges:
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.
Odour:
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.