In the UK, optimised plumbosolvency treatment solutions to meet the 10 µg/L standard had to be implemented by the end of 2003 even though the regulatory standard at customers' taps did not come into force until the end of 2013. In the case of United Utilities, which supplies water to seven million customers in the north-west of England, lead non-compliance fell from 25 % in 1995 to 3 % in 2004 as a result of the treatment solutions. In 2005 utilities started to collect the location information of where samples are taken from. This has provided a new opportunity to relate lead risk to location and properties.