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Water Supply System


The water which we supply to your home comes from two spring fed streams, the Tautau and the Waiorohi. With such a valuable resource we are committed to using it efficiently and protecting it from pollution on its journey to the sea.

Water supply system components

Water Supply Components

At the top of the system is the catchment - this is the land where the rain falls and springs discharge groundwater and collectively form a stream.

Water is pumped from the streams at the water supply intakes and piped to the water treatment plants.

The treatment plant removes all the dirt and bugs, chlorine is added to keep the water safe.

Trunk mains are used to move the water to reservoirs.

From the reservoirs the water is piped through the reticulation system to homes, businesses and other water users around the City.

The Council's system ends at the outlet side of the water meter, known as the point of supply. Up to that point, it is the Council's responsibility to make sure everything works.

After that the home owner, business or other user is responsible.

  • Catchments and Intakes:  Tautau and Waiorohi 
  • Treatment Plants: Oropi and Joyce 
  • Reservoirs 
  • Distribution System 
  • Point of Supply 
  • Details Schematic

The Distribution System

Treated water is distributed around the City in a complex network of pipes ranging in diameter from 750mm for the trunk mains down to 20mm in local reticulation. The maze of pipes have been designed so that water can be fed to suburbs from more than one direction so if there is a break in the pipes, the water can still get through to most properties.

The map shows the main pipes in the system.  The dark blue pipes are those supplied from Joyce Road Water Treatment Plant. The red pipes are from the Oropi Plant.

Water Pipes

The pipes around the distribution system are sized to maintain adequate flow and pressure to homes and businesses. Council is using a computer model to optimise the size of the pipes.  This looks at water demand and the capacity of the pipe system and shows where the bottlenecks could occur as demand grows.  This enables the Council to plan upgrades to the system to cater for population growth.

Point of Supply

The "point of supply" is where the Council's pipes stop and the customers' start.

This changeover is at the outlet connection of the toby/meter, i.e. on the house or business side. Up to that point, including the meter, the Council is responsible for anything that goes wrong.

Beyond that point the pipes belong to the home owner, business or other user and they are responsible if there is a leak or any other sort of problem.

The standards of the water supply delivered at the point of supply are set out in the "Levels of Service" prepared by the water section of City Services.  These cover the acceptable pressure ranges, what sort of flow rates people can expect, the water quality and consistency of supply.  These indicators are continuously monitored and reviewed annually to ensure a high quality supply.

Council works hard to achieve these Levels of Service at the point of supply, but that is as far as it can go.  People can still get an inferior water supply if there are problems in the pipe work on their property.  For example, there can be low pressure in the home even though there is adequate pressure at the toby.  The reason is often a long, old (and corroded) pipe from the toby to the house which is so clogged up that it soaks up all the pressure.  So when the water finally gets to the house it has little or no pressure left.  As the problem is in the private householder's pipes, the property owner (not the Council) has to fix them. 

More Information on Water Leaks


Last Reviewed: 11/04/2017