Can you switch water supplier in Wales?

In Wales, businesses, charities or public sector organisations that are currently served by a Welsh supplier may only switch retailers if they use in excess of 50 million litres of water per year. If not, they must continue to be served by their local water company.

For customers whose premises are in Wales and their water use is above 50 million litres per year, there’s a choice to remain with the existing retailer or switch to one of the retailers shown below, but if a premises is already served by Dee Valley Water, it is not possible to switch to Welsh Water or vice versa.

Licensed water retailers serving Wales*

* Listed in a randomly generated order

Dwr cymru, Welsh Water company logo

Dŵr Cymru Welsh Water

Dŵr Cymru Welsh Water is the sixth largest of the ten regulated water and wastewater companies in England and Wales.
With its unique not for profit operating model in the water industry in England and Wales, it is owned on behalf of its customers.


0800 260 5051

hafren dyfrdwy severn dee company logo

Hafren Dyfrdwy

Hafren Dyfrdwy also means Severn Dee, the coming together of Dee Valley Water and Severn Trent to form a new water service for our customers in Wales. We’re committed to keeping bills low and providing fresh water to you, for generations to come.


0800 086 8033

ses business water colour logo

SES Business Water

SES Business Water is an established proactive water retailer with proven billing, meter reading, AMR and water management services.


01306 733 200

castle water colour logo

Castle Water

Castle Water cites itself as the UK’s leading independent business water retailer, providing water and wastewater services to hundreds of thousands of businesses, charities and public bodies in England and Scotland.


01205 718700

water 2 business colour logo

Water 2 Business

Water 2 Business Limited is a joint venture between Bristol Water and Wessex Water and is licensed to provide water supply and wastewater removal retail services to businesses customers in the new market.


0345 600 2 600

Waterplus company logo


Water Plus is a water retailer providing billing, meter reading, account management, water efficiency and other services for businesses and organisations across England and Scotland. The company is a joint venture between Severn Trent Water and United Utilities.

Water Plus is licensed to provide water supply and wastewater removal retail services to businesses. It works with businesses across all sectors, from major users and multi-sites, to small, medium and micro businesses.


0345 072 6072

Business stream company logo

Business Stream

Business Stream has been supplying water and wastewater services to UK customers in various sectors since 2006 and has acquired the non-household customer base of both Southern Water and Yorkshire Water. Offering tailored solutions, Business Stream operates as a retailer in the open water market.


0330 123 2000

Waterscan creating sustainable water future company logo


Waterscan has established itself as a specialist provider of water procurement and self-supply services, differentiating them from the standard retail offering. The business cites itself as working independently on behalf of the customer, either managing water supply tenders or performing retailer functions including meter reading.


01243 839 880


Regent Utilities Water

Regent Utilities Water

Regent Water is an associated business within Regent Gas, an established commercial gas supplier in the UK since 1995. Regent Water has a water and waste water supply license to cover all the areas in England and Wales.


0845 241 2700

the water retail company colour logo

the Water Retail company

The Water Retail Company is a relatively new entrant to the business water market. The business claims to offer a bespoke service that lowers consumption, reduces bills and improves the environmental footprint of businesses. Headed by a team with extensive experience in the water industry and utilities sector, it reports a simple, transparent, no-nonsense approach to allow it to offer highly competitive pricing for water and sewerage services.


020 3808 6608

Source for Business company logo

Source for Business

Source for Business is the national retail brand of Pennon Water Services (part of Pennon Group plc) which is licensed to provide water supply and wastewater removal services to customers across England in the business retail water market. Also licensed in Scotland, Source for Business cites itself as offering a ‘one-stop shop’ for non-domestic water management with simplicity and transparency.


0800 042 0347

Affinity for business company logo

Affinity for business

On the 1st April 220 Affinity for Business merged with Castle Water, creating Castle Water (Southern) Ltd. to continue to serve Affinity’s existing customers.

The business cites an experienced team, now part of the 400-stong Castle Water group, who are committed to helping customers with all aspects of an account, from billing queries, low cost water saving devices to large scale water conservation projects.


01250 718700

Cambrian company logo

Cambrian Utilities

Cambrian Utilities is a business-to-business retail company providing water services to businesses in the UK. It is part of the Glas Cymru Group, which provides water and waste water services to customers in most of Wales and parts of England through its subsidiary Dŵr Cymru.

Unfortunately, Cambrian Utilities are currently accepting no new customers.


0303 313 0025

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For more information about switching water supplier call 03300 552532 or email