United Utilities

United Utilities was formed in 1995 through the merger of North West Water and Norweb, the regional water and electricity companies, creating a multi-utility group. The company was privatised in 1989 as North West Water, following the Water Act 1989, which transferred water and sewerage services from public authorities to private companies. In 1996, the group divested its electricity distribution business to focus solely on water and wastewater, a strategic shift that shaped its modern identity. The company is headquartered in Warrington, Cheshire, and its shares are listed on the London Stock Exchange, where it is a constituent of the FTSE 100 index.

United Utilities operates an extensive network of over 42,000 kilometres of water mains and 76,000 kilometres of sewers, along with around 100 water treatment works and 600 wastewater treatment works. The company supplies an average of 2,000 million litres of water per day and treats over 3,000 million litres of wastewater daily. Its largest water treatment facility, at Thirlmere in the Lake District, draws water from a reservoir originally built in the 19th century and now operates under strict environmental regulations. The company also manages a significant number of reservoirs and aqueducts, including the Haweswater and Thirlmere systems, which supply Manchester and surrounding areas.

United Utilities is regulated by Ofwat, the economic regulator for the water sector in England and Wales, which sets price limits and service standards every five years. The company's performance is measured against leakage targets, environmental compliance, and customer satisfaction metrics. In recent years, United Utilities has invested heavily in reducing leakage, aiming to cut it by 15% by 2025, and has committed to achieving net-zero carbon emissions by 2030. The company also faces scrutiny over sewage discharges, with environmental groups and regulators monitoring its performance under the Water Industry Act 1991 and the Environment Act 2021.

United Utilities owns and operates the Lake District's water infrastructure, including the Thirlmere and Haweswater reservoirs, which were originally built in the 19th century to supply Manchester. The company also manages a network of aqueducts, including the 96-mile-long Thirlmere Aqueduct, which was completed in 1894 and is still in use. United Utilities has a subsidiary, United Utilities International, which provides consultancy and operational services to water companies abroad, including in the Middle East and Asia. The company also operates a water treatment works at Watchgate, which uses one of the largest ultrafiltration plants in Europe. In 2020, United Utilities became the first UK water company to achieve the Carbon Trust Standard for its supply chain.

Ofwat

The Water Services Regulation Authority, the economic regulator for water and sewerage companies in England and Wales.

Wastewater

Used water from homes and businesses that is treated before being returned to the environment.

Aqueduct

A long channel or pipeline built to transport water over a distance.