The Triennial and Annual Drinking Water reports published by the Chief Inspector have shown that the industry figure for public water supply compliance with the regulations is well above 99.9% which indicates that the drinking water supply in England and Wales is excellent.
If you have concerns about the quality of your tap water, you should first approach your water supplier and explain the problem to them. If you are unsure who your water supplier is, you can find out by entering your postcode on the Water UK website. Companies will normally take a sample in response to a complaint from a consumer depending on the nature of it. Additionally, they test water daily in your area and will give you the results free of charge on request. This is also available on many water company websites.
Private Water Supplies
Your local authority will provide advice on any testing and arrange for this to be carried out on your behalf. If you are unsure who your local authority is, please visit the GOV UK website.
The last option is to have the water tested privately for which there will be a charge. You can find your nearest approved laboratory by visiting the UKAS website.