UK water companies are responsible for providing water supply and wastewater services across England, Scotland, Wales, and Northern Ireland. These companies ensure that clean drinking water is delivered to homes and businesses while also managing the treatment and disposal of sewage. They operate under regulations set by the government and are accountable for maintaining water quality and infrastructure. There are several major water companies in the UK, including Thames Water, Severn Trent, and United Utilities. Each company serves specific regions and is tasked with investing in infrastructure improvements to meet the needs of growing populations and to address environmental concerns.