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: March 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). The plant became non-compliant for Biochemical Oxygen Demand (BOD) 90-day, 90th percentile limit on 26 February 2024. 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 March.
Odour:
No odour complaints in March.
Items of significance:
Clarifier #2 Renewal Project
Structural experts conducted their inspections in March and the subsequent mechanical remedial works required are underway. The planned main bearing and structural replacements will succeed these works with a target completion date of July projected.
Inlet Pump Station (IPS) Project
The project commenced late March with Wet Well #1 being taken offline and deep-cleaned. The contractors will establish on site early April to begin the remedial works ahead of fully replacing the two riser pipes. The temporary reduction in the pump station’s discharge capacity does increase the risk of untreated wastewater overflows to the short outfall during heavy rainfall, however expectation is that Wet Well #2 can cope with dry weather flow rates.