South East Water is a UK supplier of drinking water to 2.2 million consumers in Kent, Sussex, Surrey, Hampshire and Berkshire and is a private limited company registered in England and Wales.

Each day the company supplies on average 521 million litres of drinking water from its 83 water treatment works and manages more than 14,500 kilometres (about 9,000 miles) of its water mains. The company’s supply area covers 5,657 square kilometres. The company takes water from rivers, reservoirs and underground sources (aquifers) under abstraction licences issued by the Environment Agency.