Our business
We are the UK's largest water and wastewater services company. Every day, we supply 2,600 million litres of tap water to 8.5 million customers across London and the Thames Valley. We also remove and treat 2,800 million litres of sewage for an area covering 13.6 million customers.
We carry out over 500,000 tests per year to ensure our drinking water - currently at its best-every quality - meets stringent UK and European standards.
We operate the Thames Water Ring Main, a 50-mile-long feat of engineering which supplies much of London, and which we are currently extending.
Our 349 sewage treatment works include Beckton, in East London, which is the largest in Europe. Several of these works create renewable energy, making us the biggest generator of 'green power' within the M25.
Other major Thames Water sites include our Customer Centre in Swindon, which annually handles four million enquiries and manages 3.5 million accounts. Our company headquarters is Clearwater Court in Reading.
Major projects include work to create the UK's first large-scale desalination plant, which will remove salt from water taken from the tidal Thames to help ensure supplies for Londoners during future droughts.
We are also replacing the capital's oldest water mains, many of them more than 100 years old, to reduce leakage and safeguard supplies for the future. By 2010, we will have renewed over 1,300 miles of pipes.
In this section
- Our region
- Find out more about the areas we supply clean water and wastewater services.
- Facts and figures
- Take a look at this section if you want to find out how many treatment works we have, the total length of our sewers, or other basic facts about what we do.
- Our management
- Our directors between them have a wealth of management and financial experience, together with extensive knowledge of the water industry and other regulated utilities.
- Financial information
- This section tells you more about the make-up of the consortium which owns Thames Water, and contains bond information and details of our financial results.
- Our culture
- Find out more about our values as a company and the standards we expect of our people.
- Our awards
- Since new ownership in 2006, we have performed better than ever, and our business has been recognised and rewarded by many bodies.
- Timeline
- Travel back through the centuries to learn more about the history of local water and wastewater services, then explore the innovations of the present day.
- Our regulators and agencies
- We seek to work collaboratively with all of our regulators to maintain our good performance and compliance record.



