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Water supply

Water supply

Updated 25 May 2015 4:12pm

Wellington Water launched

Wellington Water is the new company created by the merger of Greater Wellington Regional Council’s water supply group and Capacity Infrastructure Services (which was owned by Hutt, Porirua, Upper Hutt and Wellington city councils). The merger was effective from 19 September 2014.

Wellington Water manages the water treatment and supply, stormwater and wastewater service delivery in the Wellington region. 

The five local authorities are joint and equal owners of the new company. A representative from each authority sits on the specially created regional Wellington Water Committee that will provide overall leadership and direction of the new company.

More information on the merger can be found here.

Water supply to Lower Hutt, Porirua, Upper Hutt and Wellington

High quality water is essential for the health and wellbeing of our region.  The cities of Lower Hutt, Porirua, Upper Hutt and Wellington are all supplied water by Greater Wellington Regional Council.

Our role as bulk water supplier to the region's cities involves:

  • Operating four water treatment plants, 15 pumping stations and just over 180 kilometres of large-diameter pipelines
  • Supplying enough water each day - around 140 million litres on average - to meet the needs of around 400,000 people
  • Maintaining a high quality of treated water, consistent with New Zealand's drinking water standards
  • Planning to ensure that the water needs of future generations can be met
  • Managing assets with a book value of $464 million

Our part in providing the region's water supply costs around $26 million dollars annually, or 52 cents per thousand litres. Each week we deliver enough high-quality water to fill Wellington's Westpac Stadium.

The Water Supply Annual Report for the year ended 30 June 2014 is available to download.  Click on the report in the Documents box on the right hand side of your screen.

To find out more about our water - check out the information below:

Building resilience in our water supply network

The Regional Council is constantly working to improve the resilience of the bulk water supply network in the event of a natural disaster such as an earthquake.

Bulk water supply - live

The live map shows the current rate of water supply (updated every 15 minutes from 8am) from Greater Wellington's water treatment plants to our region's four cities.

There are also graphs showing the water consumption by our four cities and the water production from our water treatment plants.

Planning for regional growth

GWRC is continually planning on how we will meet the future water needs of our region's cities. New water storage options are currently being investigated.

Water conservation

Whether you’re watering the garden, buying new appliances or brushing your teeth, there are loads of easy ways to use a bit less water.

Water quality

Safe and reliable drinking water is vital to the health and prosperity of our region and its people. We are responsible for making sure that the water supplied to Lower Hutt, Porirua, Upper Hutt and Wellington is clean and safe to drink.

Watering restrictions

Watering restrictions are used by all the city and district councils within our region. They apply every year.

Water treatment

The purpose of water treatment is to remove microbiological contamination from water for supply and to ensure that the mineral content is at safe levels. We also remove any colour (from dirt or rotting vegetation) which isn't harmful, but makes the water look unappealing.

Water use

We supply about 140 million litres (ML) of water per day (on average) for Upper Hutt, Lower Hutt, Porirua and Wellington.

Our supply serves a resident population of almost 400,000, so on average we provide about 350 litres per resident each day, or 3-4 bathtubs each. Not all of this water is used in homes. City council estimates show that households use a bit over 60% of our total supply. Other users include industry, businesses, schools, hospitals, the fire service and councils.

For more information about water use, check out these pages.

Water education

We've developed a water education resource for teachers of Years 5-8 - Turning on the tap.  Turning on the tap helps students to understand where their tap water comes from and make informed decisions about how they use it.  It provides an integrated unit of work for Year 5-8 students with content that is particularly relevant for schools in the Wellington region.  For more information about our new resource visit

Organised groups are welcome to visit one of our treatment plants (weekdays by arrangement), for a guided tour to see the treatment process in action and learn more about the region's water supply. Tours are provided free of charge. For more information contact

History of our water supply

Greater Wellington Regional Council has published an historical account of the trials and tribulations of our region's water history - Our water history - on tap. It charts our progress from the early days of settlers gathering water from streams, rooftops and shallow wells and concludes with the development of modern water treatment plants and outlines the challenges about our future supply.