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 Report 2024-2025
Carey's Gully Southern Landfill Annual Resource Consents Report 2024-2025
Moa Point Wastewater Treatment Plant Annual Resource Consents Report 2023-2024
Moa Point Wastewater Treatment Plant Annual Resource Consents Report 2022-2023
Moa Point Wastewater Treatment Plant, GWRC Compliance Monitoring Report 2022 - 2023
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 Annual Resource Consents 2020/2021
Moa Point Wastewater Treatment Plant Annual Resource Consents 2019/2020
Quarterly Reports
Moa Point Wastewater Treatment - January - March 2025 - Quarterly Resource Consents Report
Moa point Wastewater Treatment Plant October - December 2024 - Quarterly Resource Consents Report
Moa Point Wastewater Treatment Plant July - September 2024 - Quarterly Resource Consents Report
Moa Point Wastewater Treatment Plant January March 2023 Quarterly Resource Consents Report
Consent Compliance Reports
Moa Point Wastewater Treatment Plant - Compliance Monitoring Report 2023 - 2024
Moa Point Wastewater Treatment Plant - Compliance Monitoring Report 2022 - 2023
Moa Point Wastewater Treatment Plant - Compliance Monitoring Report 2021 2022
Appendices
Appendix IV - Moa Point Outfall CCE Inspection report 2025.pdf
Appendix IV - Moa Point Outfall Diving Inspection report 2025.pdf
Appendix V - Moa Pt Ambient Microbe Monitoring August 2024 Issue.pdf
Appendix V - Moa Pt Ambient Microbe Monitoring February 2025 Issue.pdf
Appendix VI - Moa Pt WWTP Smoke Test November 2024 Issue.pdf
Appendix VII - Moa Point Bypass Flow sample results Cond.16 2024/25.pdf
Appendix VIII - Moa Point Shoreline sampling post discharge Cond.10 2024/25.pdf
Appendices - Moa Point Wastewater Treatment Plant Annual Resource Consent Report 2023/2024 -
Plant performance
Current Status: Compliant (with noted issue)
Period: July 2025
Commentary​
The plant is compliant for effluent quality.
Discharges
There were three unconsented discharges via the Long Outfall in July due to wet weather and the reduced treatment capacity of the plant from the clarifier renewal works.
Odour complaints
There were three odour complaints in July relating to the Southern Landfill site and Careys Gully Sludge Dewatering plant.
Items of significance:
Clarifier #1 Renewal Project
Physical works on the clarifier are now complete with it being brought back into operation on 14 July. With all three clarifiers in operation, the plant has now returned to full processing capacity.
Odour Management System
Investigations continue into the decreased performance of the chemical scrubber system during the summer months. The plant was compliant results for Total Reduced Sulphur(TRS) in July, but investigations continue. The team are actively working with overseas odour experts to help identify the root cause of the issue, to enable them to adjust operational set points of the scrubber system and other actions to restore performance.
Read the full July 2025 Moa Point wastewater treatment plant monthly performance report