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.  Wellington and Lower Hutt get their water from several different treatment plants as indicated on the live map.  Within each city there are a number of reservoirs which hold the city's water supply.  Our more detailed system map shows the location of the reservoirs.  

To view the live map, please click here.

Notes about the map:

• You may switch between ‘Mega Litres Per Day’ and ‘Litres Per Sec’ by clicking on the appropriate button at the foot of the map
• Optimal printing is A4 landscape - you may need to adjust your margins to fit all data onto one page
• The supply totals may not add up due to changes in storage at the Haywards and Ngauranga water reservoirs (which are not shown on the map)
• The daily totals cover a 24 hour period from 8am

For more detailed information about water consumption by our four cities since 1 January 2003 please click on Cities' water use.  For more detailed information about water production from our water treatment plants since 1 January 2003 please click on Water treatment plants production.

The total water supply to Lower Hutt, Porirua, Upper Hutt and Wellington varies between 120 million litres to 220 million litres per day, with the highest demand occurring during summer (mainly due to garden watering).

The level of supply during a typical day also varies as demand for water usually peaks at around breakfast time and in the early evening.  Greater Wellington increases the amount of water supplied prior to these peaks to ensure that all city reservoirs are topped up ready for the increased demand.  This has the added benefit of using power at the off-peak rates. 

There are several reasons why a treatment plant may not be supplying water at any stage.  The river that the water is taken from may be too dirty to use (generally after a storm) or the river flows may be too low to allow for water to be taken.  The plant may also be undergoing some maintenance.