The Water Supply (Water Fittings) Regulations 1999 and the Water Industry act 1991.

It is strongly recommend that you use an approved plumber who will be able to ensure that the work complies with the regulations.

Above is the act that covers all things water in the United Kingdom. For any companies, consumers and individuals who work with water fittings and on plumbing systems. These regulations state that all work carried out on your domestic plumbing pipework must not cause any detrimental effect on the overall quality of the water that flows through the pipes.
Professional plumbing services like Highgate Plumbers carry out their plumbing work in accordance with the rules set out in the current regulations. So, should you have a need to make alterations to, or replace any plumbing in your home it is vital that it’s done to the highest safety standards. Use of approved purpose made plumbing materials, coupled with the services of a professional tradesman such as a like a Highgate Plumber is a good plan.

Regulation and Supply (WRAS):
WRAS is there to help protect the public’s health by preventing contamination of their water supplies, also maintaining the efficient use of water by promotion and facilitation and obeyence of with the Water Supply Regulations and Scottish Water Byelaws. It is a subscription membership company limited by guarantee and was incorporated on 4 August 2008. 26 UK Water Suppliers subscribe to WRAS.
It has four core objectives:
a). To provide cost effective support to water companies by providing interpretation and enforcement of the Water Fittings Regulations1.
b). To represent the UK water supply industry on the Water Fittings Regulations1 and contribute to the development of codes of practice and standards.
c). To provide processes and guidance to enable organisations and individuals to demonstrate compliance with the Water Fittings Regulations1.
d). To promote understanding of the Water Fittings Regulations1, through marketing and communications and advice.