Customer Notice

Our offices and phone lines will be closed on Monday 27 May for the Bank Holiday. We will reopen on Tuesday 28 May at 8am. You can still make a payment online. If you experience an emergency or unplanned disruption to your water supply and/or wastewater service whilst we are closed, please call your Water Network Owner. You can find a list of emergency numbers here. If you experience a problem with the water pipework inside your own building/site, you should call your plumber in the first instance.

Save up to 20% on your bill with Castle Water!

Why switch to Castle Water?

  • We make switching easy and stress free
  • Fast efficient service from our UK based team – we answer calls within an average of 33 seconds*
  • We can provide one simple bill that’s hassle free with Direct Debit
  • From consent and compliance, to billing and efficiency, we’ve got trade effluent covered too
  • We’ll help you find simple ways to save water and money

Plus… we’ve got more 5-star Trustpilot reviews than all other water retailers combined!

Get a quote!

For a business water quote, please choose from one of the following options:

For businesses in Scotland

For small/medium sized businesses in England

For large and multi-site businesses in England


Buying all your utilities together can generate greater business savings. Now we can bundle your water supply with gas and electric. How much could you save?

Request an energy quote today

  • water efficiency switch


    Switching is easy. Start saving today.

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  • water efficiency additional services


    We provide a range of additional services.

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  • water efficiency water efficiency


    Read our useful water saving tips.

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