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: June 2024
Commentary
The plant has returned to compliance for biochemical oxygen demand (BOD - all 90-day, 90th percentile limits) but remains non-compliant for suspended solids & faecal coliforms. Steps to fix this are being undertaken, however, breakdowns and planned maintenance work are delaying a return to compliance. The third clarifier coming back into service in July is expected to improve treatment processes.
Discharges
No discharges in June.
Please explain letter issued
GWRC issued a please explain letter in relation to the short outfall discharge that occurred on 1 May, a response was provided within the required timeframe.
Odour
There were 6 odour complaints relating to the Southern Landfill site and Careys Gully Sludge Dewatering plant. None were assessed to be offensive and objectionable by Greater Wellington Regional Council.
Items of significance:
Clarifier #2 Renewal Project
Excellent progress was made in June to repair the major mechanical components, including the main bearing drive and corrosion protection of the structural areas. The final minor mechanical works are now taking place.
The Clarifier is expected to be back in operation by late July 2024.