Submit an official complaint to Ofwat, the water and sewage regulator.
A complaint service is available on the Ofwat website. You can fill in a complaint or feedback form online or you can download the forms in Microsoft Word format or as a PDF.
To access PDF files you will need a copy of Adobe Reader. Information on how to download this for free is available on the right panel of this page.
This service is available in England and Wales only.