Where your water comes from

The region’s water supply is drawn from dams, rivers, groundwater and springs
A picture of a dam

Auckland’s three main water sources are:

  • Storage dams in the Hūnua and Waitākere ranges
  • An aquifer in Onehunga
  • The Waikato River

The exact proportion supplied from each source varies daily. It depends on the levels in the storage lakes, forecast rainfall, treatment plant capacity, maintenance requirements and the cost of transmitting water to the treatment plant.  

Which areas does Watercare supply?
Are there other sources of water?
What is the average rainfall per year in the Auckland region?