London On Tap was a unique campaign that saw us working with the Mayor of London to promote tap water in London's restaurants We have replaced more than 1,400 miles of old water mains, to reduce leaks and bursts and improve supplies for a growing population Each one of these tests and our processes are subject to scrutiny by external bodies such as the Drinking Water Inspectorate, who assess our water quality results and each year produces a public report on the standard of tap water They carry out tests at every stage of the treatment process up until the very last point before it is pumped into our 31,000km of water mains