Question: Lower Swineshaw Reservoir is operated by which largest listed water company in the UK?
Context: Charles Hawksley (1839–1917) was a British civil engineer.  Hawksley was born in Nottingham, England in 1839 and was the son of civil engineer Thomas Hawksley.  He studied at University College London and after graduating entered into apprenticeship with his father's firm, which had been established in 1852 and specialised in water related projects.  From 1857 Hawksley was, with his father, an adviser to the Great Yarmouth Waterworks Company and in 1866 became a partner in his father's firm.  Hawksley worked extensively in the water industry and clients included the Newcastle and Gateshead Water Company, Sunderland and South Shields Water Company, Consett Waterworks, Weardale and Shildon District Waterworks and Durham County Water Board.  Hawksley, with his father, built the Catcleugh Reservoir in Northumberland for the Newcastle and Gateshead Water Company between 1899 and 1905.  In addition to his work on reservoirs, pipes and other infrastructure for the water companies he also undertook work for the Bishop Auckland District Gas Company. "For the reservoirs near Stalybridge, in Tameside, Greater Manchester, see Higher Swineshaw Reservoir and Lower Swineshaw Reservoir " Lower Swineshaw Reservoir is the second reservoir from the top of a series of four in the Brushes valley above Stalybridge in Greater Manchester.  It was built in the 19th century to provide a supply of safe drinking water.  It is owned and operated by United Utilities. The Cuyamaca Water Company (CWC) is a defunct water company which operated in San Diego County, California between 1910-1926.  The origins of the Cuyamaca Water Company can be found in the San Diego Flume Company.  The San Diego Flume Company was purchased on June 1, 1910 for $125,000 by the prominent San Diego politician and developer Ed Fletcher and a businessman from Montana, James A. Murray.  The initial purchase transferred all water rights and properties owned by the San Diego Flume Company to the newly created Cuyamaca Water Company.  CWC was principally financed by Murray, and managed by Fletcher. Hurst Reservoir was a disused reservoir near Glossop, north Derbyshire.  In 1837, 50 local millowners and gentlemen, known as the "Glossop Commissioners", obtained an Act of Parliament to construct the Glossop Reservoirs.  Hurst Reservoir was on the Hurst Brook and Mossy Lea Reservoir was to take water from the Shelf Brook.  Only the Hurst Reservoir was constructed before the money ran out.  Mossy Lea Reservoir was later constructed privately by the Duke of Norfolk.  His engineer and surveyor was John Frederick Bateman.  The reservoir was taken over in 1929 by the Glossop Corporation Waterworks.  This became part of the Manchester Corporation Waterworks in 1959.  Swineshaw Reservoir, Hurst Reservoir and Mossy Lea Reservoir are no longer in service. Steven Lewis Mogford (born 27 June 1956) is a British businessman.  He is the Chief Executive of United Utilities Group plc, the UK's largest listed water company. The Water Company of Tonopah Building is a historic building located at the intersection of Burrough and Brougher Avenues in Tonopah, Nevada.  Built in 1909, the building housed offices for the Water Company of Tonopah.  Tonopah's first water service began in 1902, when three water companies each gained franchises to provide water to one district of the town.  By 1905, Philadelphia businessman John Brock owned two of the water companies, which he consolidated into the Water Company of Tonopah.  Brock also owned multiple mines in Tonopah and the local railroad.  The Water Company of Tonopah Building is the only surviving building which belonged to one of Tonopah's early water companies. Mossy Lea Reservoir is a disused reservoir near Glossop, north Derbyshire.  In 1837, 50 local millowners and gentlemen, known as the "Glossop Commissioners", obtained an Act of Parliament to construct the Glossop Reservoirs.  Hurst Reservoir was on the Hurst Brook and Mossy Lea Reservoir was to take water from the Shelf Brook.  Only the Hurst Reservoir was constructed before the money ran out.  Mossy Lea Reservoir was constructed privately in 1840 by the Duke of Norfolk.  It was taken over in 1929 by the Glossop Corporation Waterworks.  This became part of the Manchester Corporation Waterworks in 1959.  Swineshaw Reservoir, Hurst Reservoir and Mossy Lea Reservoir are no longer in service. United Utilities Group PLC (UU), the United Kingdom's largest listed water company, was founded in 1995 as a result of the merger of North West Water and NORWEB. "For the reservoirs near Glossop, in Derbyshire, see Upper Swineshaw Reservoir and Swineshaw Reservoir (Derbyshire) "
Answer: United Utilities