If you look at a part of the law called the Health Act 1956, you will find a section that was called 'Duty to investigate complaints'. This section was part of the rules for people who supply drinking water. You should know that this section is no longer in use because it was repealed. It was repealed on 15 November 2021 by a change made in the Water Services Act 2021, which you can find more information about by visiting the Water Services Act 2021 webpage.