Wastewater collection and treatment

Each day, we collect about 400 million litres of wastewater and treat it to a very high standard.  We maintain and operate the wastewater system up to the connection point at your property, taking care to avoid odours and overflows. 

Our wastewater network consists of:

  • 7999 kilometres of wastewater pipes
  • 18 treatment plants
  • 518 wastewater pump stations
  • 167,264 manholes           

Video: Treating wastewater at our Mangere plant

What is wastewater?
Collecting wastewater
Treating wastewater
What happens after it’s treated?
What are biosolids and how are they used?
Is wastewater tested?