Thames Water is the monopoly private utility company responsible for the public water supply and waste water treatment in large parts of Greater London, Luton, the Thames Valley, Surrey, Gloucestershire, Wiltshire, Kent, and some other areas of the United Kingdom. Thames Water is the UK's largest water and wastewater services company. It supplies 2.6 billion litres of drinking water per day, and treats 4.4 billion litres of wastewater per day. Overall, Thames Water's 15 million customers comprise 27% of the UK population. Moreover, Thames Water is responsible for a range of water management infrastructure projects in the United Kingdom. Apart from that, in the international domain company takes active measures to protect the environment, support corporate responsibility and sustainability, and increase the level of health and safety.