Your Wastewater System

What is wastewater?

Wastewater is all the water that you have used at home or work in your kitchen, bathroom, toilet or laundry. Wastewater contains 99% water and about 1% human and other waste.

The Porirua wastewater system is made up of a large network of pipes and pumping stations that feed into the treatment plant at Rukutane Point. The system serves Porirua and Northern Wellington suburbs.

The network

The  wastewater network starts at your home with your household plumbing, a gully trap and lateral pipes that carry your wastewater into the public wastewater network, which consists of:

  • 180 square kilometres of catchment across Porirua city and north Wellington suburbs Newlands, Johnsonville and Tawa
  • 573 kilometres of pipes and 54 pumping stations
  • Feeds into the wastewater treatment plant at Rukutane Point 

The treatment plant

At the plant, wastewater is treated, or cleaned, before being pumped out to sea.

  • Capacity to treat 1000 litres of wastewater per second - to be upgraded to 1,550 litres per second by 2023 - find out more here
  • Treated effluent is discharged out to sea via an outfall off Rukutane Point
  • Improved quality of discharge is keeping the coastal shores cleaner and safer.

Issues with the wastewater system

The network of pipes is aging, and the population is growing. The network can get overloaded in heavy rain, partly because incorrect connections send run-off into the wastewater system instead of down stormwater drains.  This can lead to untreated wastewater overflowing into the environment.