WRAS (Water Regulations Advisory Scheme) certification is a product safety certification for UK residential drinking water systems issued by WRAS Ltd. The certification specification is derived from the requirements of the Water Supply Regulations 1999 for England and Wales, the Scottish Water Act 2004 and the Northern Ireland Water Regulations 2004. The purpose of WRAS certification is to provide local authorities and users with the assurance that the product will not cause excessive depletion, misuse, improper use or contamination of drinking water and can therefore be imported directly into the UK market.

WRAS is also accepted and used directly in residential drinking water systems by governments and health authorities in many countries outside the UK, such as Europe, the Middle East and Southeast Asia. WRAS certification is a requirement for access to the UK market, where water authorities are required to verify that products installed in drinking water systems meet the relevant drinking water standards when providing water to residential buildings. WRAS approval is the most convincing proof. All WRAS certified products will be given a unique certification number and will be issued with a certificate and will be listed on the WRAS website for global sourcing

Tested in accordance with British Standard BS6920. The scope of the test includes: plumbing pipes, bathroom taps, kitchen taps, valve components, rubber products, plastics and all other materials that come into contact with drinking water and that may be used in the manufacture of the equipment in question.

All products tested by the laboratory must comply with the British BS6920 or BS5750PART standards to ensure that the taste and color of potable water will not be changed, will not lead to the growth of microorganisms, toxic metals will not be precipitated, and will not contain or precipitate other substances that are harmful to health. Material testing must be certified, or mechanical testing cannot be performed in the overall product.

Non-metallic materials can be certified by WRAS if they meet the requirements of the standard BS6920:2000 (Water suitability for human use through the effect of non-metallic products on water quality).

Experiments were conducted to assess the impact of materials on water quality in the following five areas: smell, color and turbidity, precipitation of metals, precipitation of toxic substances, and factors contributing to microbial growth.

Products such as plumbing pipes and bathroom taps, kitchen taps are subject to mechanical and material testing, ( in the UK WRc-NSF laboratory ) certain components must have material testing through proof, otherwise physical testing in the overall product is not possible.