5 April 2012 Last updated at 08:49 ET

How much does your water company leak?

The water industry in England and Wales loses 3.36 billion litres of water a day in leaks.
The water companies are investing in improvements to their network and leaks are now 35% lower than in the mid-1990s.
However, if all the pipes could be fixed it would save enough water to supply 22.4 million people every day.

Who supplies your water?

One person uses 150 litres of water per day on average.
Find out how much your provider leaks.

Thames Water loses 664.6 million litres of water per day. That's enough to supply 4,430,400 people or 50% of their domestic users.

How do they rate?

Major water companies in England and Wales ranked by the percentage of their supply that is lost in leaks

Leaks in 2010-11, litres per day Water supplied 2010-11, litres per day

• 0.5bn
• 1bn
• 1.5bn
• 2bn
• 2.5bn

• Severn Trent Water
  27%
   
• United Utilities Water
  26%
   
• Thames Water
  26%
   
• Yorkshire Water
  25%
   
• South Staffordshire Water
  24%
   
• Dwr Cymru Welsh Water
  24%
   
• Northumbrian Water
  22%
   
• Veolia Water Central
  21%
   
• Wessex Water
  21%
   
• South West Water
  20%
   
• Anglian Water
  19%
   
• Bristol Water
  18%
   
• Cambridge Water
  18%
   
• Veolia Water Southeast
  18%
   
• Veolia Water East
  17%
   
• South East Water
  17%
   
• Portsmouth
  16%
   
• Southern Water
  16%
   
• Sutton & East Surrey Water
  15%
   
• Dee Valley Water
  15%
   
• Sembcorp B’mouth Water
  14%
   
• Essex & Suffolk Water
  14%
   

Source: Ofwat, Environment Agency, water companies

The water companies are investing in improvements to their networks and are set targets for leaks by the water regulator, Ofwat.

Since 2005, the companies ranked in the top five above - Severn Trent Water, United Utilities Water, Thames Water, Yorkshire Water and South Staffordshire Water - have reduced leaks by a combined amount of 226.86 million litres a day.

Thames Water has shown the most improvement, reducing its leaks by almost a quarter over that period.

In 2011, six companies missed their leakage targets: Anglian Water, Dwr Cymru Welsh Water, Northumbrian Water, Severn Trent Water, Southern Water, Yorkshire Water.

Water leaked by company since 2005

Select a water company to highlight data

Click and drag in the chart to zoom in

• Anglian Water
• Bristol Water
• Cambridge Water
• Dee Valley Water
• Dwr Cymru Welsh Water
• Essex & Suffolk Water
• Northumbrian Water
• Portsmouth
• Sembcorp B’mouth Water
• Severn Trent Water
• South East Water
• South Staffordshire Water
• South West Water
• Southern Water
• Sutton & East Surrey Water
• Thames Water
• United Utilities Water
• Veolia Water Central
• Veolia Water East
• Veolia Water Southeast
• Wessex Water
• Yorkshire Water

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Source: Ofwat