Booth Wood Reservoir. The company has now built a pipeline from the east to the west to allow the balancing of water levels should the need arise. Following the "year of drought", Yorkshire Water became known as "the most hated water company" during this period, with "staff having to travel in unmarked vans for fear of reprisals". Many suspected Yorkshire Water would never be able to win back customers' trust. 2007 Hull floods The company came under intense criticism when the Bransholme pumping station failed, worsening the flood damage to the city and flooding two thousand homes on the Kingswood and Bransholme estates. The pumping station was upgraded in 2016. 2022 Sheffield gas supply outage Yorkshire Water were criticised in December 2022 when a burst water main operated by the company caused flooding in the Stannington area of Sheffield, which subsequently entered the local gas network and left thousands of properties without a natural gas supply for more than a week amid below-freezing temperatures. The burst water main occurred during the evening of 2 December and leaked more than 400,000 litres of water into the local gas pipe network before finally being fully repaired five days later. Sheffield City Council declared a major incident and aid was distributed to residents as a result of the crisis. Customer service Yorkshire Water ranked 11th of 21 water companies in Ofwat's 'Satisfaction by company' survey 2012/13. in January 2015 the UK Customer Service Index (UKCSI) announced that Yorkshire Water was the leader for service in the Utilities sector, they were also the second most improved organisation in the whole UKCSI, beating competitors such as Severn Trent, Anglian, Thames Water as well as United Utilities and EDF. The UKCSI is the only external measure showing the state of customer satisfaction in the UK and allows individuals to benchmark across all sectors as well as utilities. Drinking water quality Not taking into account human composition: In the year ending 31 March 2013, 99.93% of Yorkshire Water's samples met the UK standards; in the previous year it was 99.95%. Carbon footprint In 2012/13 the company's greenhouse gas emissions totalled 386 kilotonnes, compared to 394 kilotonnes the previous year. Constituents The authority created in 1973 took over the following public sector water supply utilities: Barnsley Corporation Bradford Corporation Huddersfield Corporation Kingston upon Hull Corporation Leeds Corporation Rotherham Corporation Scarborough Corporation Sheffield Corporation Norton Urban District Council Rawmarsh