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: July 2024
Commentary
The plant remains non-compliant for suspended solids and faecal coliforms (all 90-day geomean, 90th percentile limits). Steps to fix this are being undertaken, however, breakdowns and planned maintenance work have delayed a return to compliance.
Discharges
There was one unconsented wet weather discharge on 1 July.
Please explain letter issued
GWRC issued a please explain letter on 12 July for several odour complaints lodged in relation to the Southern Landfill/Careys Gully SDP on 28 May. A response was provided within the required timeframe.
Odour
No odour complaints in July.
Items of significance:
Clarifier #2 Renewal Project
All works have been completed with the clarifier being brought back into service on 22 July. This means that all three clarifiers are now operational, and the plant returned to its full treatment capacity.
Effluent Compliance
The third clarifier coming back into service is expected to improve the biological process although this change will be gradual as the process stabilizes. The current daily results for both suspended solids and faecal coliforms are close to compliant levels and the 90-day geomean and 90th percentile limits indicate positive improvement.