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According to the Consumer Council for Waters website the average water usage is shown below.  More deatils can be found on their website www.ccwater.org.uk

Metering - How much water does an 'average' person/household use?

Because water usage varies enormously, it is difficult to give a specific answer, but the table below will give you an idea of what we think are reasonable figures. You can monitor your own usage by reading the meter regularly or comparing the amounts recorded on your bills. By doing so, leaks or other problems (for which you may be responsible) can be picked up as early as possible.

The table below provides an approximate guide to how much water different types of households might use. The table is a rough guide only. If you want more detail about how much water you think you will use, please calculate your usage using our water meter calculator.

 

Number of People

Living at Home

ANNUAL WATER USAGE

IN CUBIC METRES 

Annual cost base on 3.0 per cubic metre
  Low / Average / High    Low/Average/High
One 45 / 66 / 100 135/198/300
Two 55 / 110 / 136 165/330/408
Three 82 / 136 / 175 246/408/525
Four 110 / 165 / 210 330/495/630
Five  136 / 182 / 245 408/546/735
Six 155 / 200 / 265 465/600/795

Notes:
The prices are average and a guideline only, based on a household receiving water and wastewater services from Southern Water during 2012/2013. The guides are based on a flat profile of water consumption throughout the year.

This charge is worked out on the basis that 92.5 per cent of water used goes into the sewers, because some is used in the gardens or evaporates.

The 3.5 figure has been calculated to include the standing charge applied to water supply and waste water.

 

Typical cost for using water in the home

Domestic use Water Cost (pence) Litres Used
Shower 10.5-12.0 35-40
Bath 24.0 80
Flushing the Toilet 1.0-3.0 6-9.5
Watering the garden 160.0 540 per hour
Using a dishwasher 6 20
     
Above Source: Ofwat 2009    
     
Water softener cleaning 5.0 17
Water softener cleaning 9.0 30

Note: cost for water softeners does not include the cost of the salt

 

More information can be found at

http://www.water.org.uk

www.yourwatermeter.com