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Knowledge Hub / The Network / Wastewater / Wastewater treatment plants / Western Wastewater Treatment Plant

Western Wastewater Treatment Plant

At the Western Treatment Plant, sewage travels through a series of screens, tanks, bioreactors, clarifiers and ultraviolet treatments before being discharged as liquid into Cook Strait in the vicinity of the Karori Stream Mouth.

The Western Treatment Plant was granted new consents on 28 July 2010. These consents will continue for 25 years (expire 28 July 2035).

In general, the consents allow Wellington City Council to:

  • discharge of treated and partially treated effluent through an existing outfall,
  • to discharge mixed disinfected, treated and milli-screened wastewater during and/or immediately after heavy rainfall,
  • the discharge of contaminants to the air,
  • and permission to occupy the coastal marine area with an outfall structure.

Resource consents

Resource consent reports

Plant performance

 

 

 

 

Current Status: Compliant
Period: February 2025

Commentary:
The plant is compliant for effluent quality.

​Discharges:
No discharges in February.

Odour complaints:
No odour complaints in February.

Items of significance:

Outfall pipe remedial works 

Minor remedial repairs identified in last year's annual inspection of the outfall pipeline will be taking place from late February until mid-March. Once these works have been completed another full inspection of the pipeline will be carried out.

 

 

 

 

Community Liaison Group Meetings