The Approved Contractors' Schemes

To become a member of WaterSafe, a plumbing business or sole trader must join one of the seven Approved Contractor Schemes operating 

within the UK.

A Plus stands for the Anglian Water approved plumber/contractor scheme. It is an Anglian Water accredited scheme which ensures the plumbers/contractors you use comply with the mandatory Water Supply (Water Fittings) Regulations 1999.

APHCThe Association of Plumbing and Heating Contractors (APHC) is the trade body for plumbing and heating businesses in England and Wales. It represents sole traders working in domestic properties to large companies working on commercial projects, helping installers run professional and profitable businesses.

The Chartered Institute of Plumbing and Heating Engineering is the UK’s professional body for plumbers and others in the plumbing industry. The Institute is a registered educational charity with the prime objective of improving the science, practice and principles of Plumbing and Heating Engineering in the public interest.

The Scottish and Northern Ireland Plumbing Employers’ Federation (SNIPEF) is the trade association for plumbing and heating businesses in Scotland and Northern Ireland. SNIPEF has around 750 member firms employing more than 4,000 operatives and nearly 500 apprentices.

Thames Water
TAPS was set up by Thames Water following the introduction of the Water Supply (Water Fittings) Regulations 1999. The scheme is free to join, providing the applicant meets the criteria for the type of membership they are applying for. There are three types of membership available.


The Water Industry Approved Plumbers' Scheme (WIAPS) is managed by the Water Regulations Advisory Scheme (WRAS) Ltd on behalf of fifteen Water Undertakers in England and Wales. It does not apply to areas that are geographically covered by Severn Trent Water, Anglian Water or Thames Water.

Severn Trent
WaterMark is administrated by Severn Trent and in order to become a WaterMark member, a plumber has to show they have been suitably trained, that they have adequate knowledge of the Regulations through passing an assessment and that they have sufficient public liability insurance cover.

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WaterSafe Approved Contractors' Scheme Operators

Anglian WaterAssociation of Plumbing & Heating ContractorsCIPHESevern TrentSNIPEFThames WaterWIAPS