Water Supply (Water Fittings) Regulations

The Water Supply (Water Fittings) Regulations 1999 are national requirements for the design, installation and maintenance of plumbing systems, water fittings and water-using appliances. 

What the regulations are for

The regulations prevent waste, misuse, undue consumption, erroneous measurement and prevent contamination.

Where the regulations apply

The regulations apply to all plumbing systems, water fittings and water-using equipment connected to the public water network.

The regulations apply from the point water enters the property’s underground service pipe.

Premises without a public water supply connection are not governed by these regulations.

How the regulations apply to you

Owners, occupiers and anyone who installs plumbing systems or water fittings, have a legal duty to make sure systems meet the regulations. 

Architects, building developers and plumbers must follow the regulations on behalf of the future owners or occupiers.

Water fittings regulations training

Hafren Dyfrdwy are reaching out to colleges in their region to help support the development of plumbing students in their knowledge and application of the Water Supply (Water Fittings) Regulations 1999.

To enable us to do this our experienced Water Fittings Technicians visit the college to give a presentation on the Regulations, how they impact plumbing practices and affect water quality standards.

Alternatively, you may wish to visit our brand new training academy in Coventry!

All training and educational awareness sessions are free of charge. The upskilling sessions are ideally suited to level 3 plumbing students and last for approximately two hours.

You can contact us to request this on 0345 266 7922 or by email


Notifying the water company of work

In most cases, the installer, owner or occupier must give us advance notice of proposed work.

It is not possible to begin work until we have given consent.

Consent will not be withheld unreasonably, and may be granted subject to conditions, which must be followed.

If consent is not given within ten working days, it is deemed to have been granted. 

The installer, owner or occupier must make sure work meets the Regulations.

Enforcing the regulations

The Government require us, the water company, to enforce the regulations.

We will inspect installations, in line with our enforcement policy [PDF]

As the owner, occupier or installer, it is your legal duty to ensure the systems meet the requirements. Where we find breaches of the regulations, you must correct the work.

Carrying out plumbing work at inland waterways and marinas (e.g. boat yards)

If you need to carry out plumbing work at a marine location such as a boatyard or dock, read the industry best practice guidance for inland and coastal marine work [PDF] to make sure your project is compliant.

Contact our team

You can contact our Water Regulations team by email, you can call on 0345 266 7922 or write to:

Hafren Dyfrdwy, Water Fittings Dept

West Service Road, Raynesway

Derby DE21 7BE