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 2023-2024
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 FY2022 23 Annual Resource Consents Report 1
Moa Point Wastewater Treatment Plant, GWRC Compliance Monitoring Report 2022 - 2023
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
Moa Point Waste Water Treatment Plant Annual Resource Consent 2023/2024 - Appendices
Plant performance
Current Status: Non-compliant
Period: May 2025
Commentary
Effluent results are compliant with daily limits. Faecal coliforms remains non-compliant for the 90th percentile limit but trends project this parameter to move into compliance in early June.
Discharges
There were four unconsented discharges via the Long Outfall in May due to wet weather and the reduced treatment capacity of the plant from the clarifier renewal works.
Odour complaints
There was 1 odour complaint in May relating to the Southern Landfill site and Careys Gully Sludge Dewatering plant.
Infringement Notices issued
GWRC issued two infringement notices for ongoing discharge of non-compliant effluent and for breach of Abatement Notice A981 relating to discharge of non-compliant effluent.
Items of significance:
Clarifier #1 Renewal Project
Physical works on the clarifier are progressing well; the project is nearing the closing stages and is expected to be back in service by end of July. With two of three clarifiers in operation, processing capacity is reduced.
Odour Management System
Investigations continue into the decreased performance of the chemical scrubber system during the summer months. The plant recorded non-compliant results for Total Reduced Sulphur (TRS) during this period. 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.