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How do I find out who my current water or wastewater retailer is?

Since the retail water market opened on 1 April 2017, business customers are now billed by water retailers, rather than the regional water companies – now known as wholesalers.

Business customers should have been contacted by their water company ahead of the market opening to advise which water retailer would serve their premises from 1 April 2017.

If you’re still unsure who your water retailer is, you can find out by checking your most recent water bill.

If you can’t find a bill or if you have recently moved to new business premises, you can contact any water retailer and they can tell you which water or wastewater retailer is registered to your premises.

The chart below illustrates the relationship between wholesalers (regional water companies) and retailers. For example, if your premises were billed by Thames Water before the market opened on 1 April 2017 — and has not actively switched to another retailer — you will now receive bills from Castle Water.

Wholesalers Retailers
Affinity Water Castle Water (Southern)
Anglian Water (including Hartlepool) Wave
Bristol Water Water2Business
Dŵr Cymru (Welsh Water) Cambrian Utilities
Northumbrian Water (including Essex & Suffolk) Wave
Portsmouth Water Castle Water
Sembcorp Bournemouth Water Source for Business
Severn Trent Water Water Plus
South East Water Castle Water (South East)
Southern Water Business Stream (Scottish Water Business Stream)
South Staffs Water Source for Business
South West Water Source for Business
Sutton & East Surrey SES Business Water
Thames Water Castle Water
United Utilities Water Plus
Wessex Water Water2Business
Yorkshire Water Business Stream (Scottish Water Business Stream)


Businesses can choose whichever retailer they would like to work with — they can either renegotiate a better deal with their current water retailer or switch to a new retailer.

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