Customer Notice

Our offices and phone lines will be closed for Good Friday. Our Scotland offices and phone lines will reopen at 8am on Monday 22 April. Our England offices and phone lines will reopen at 8am on Tuesday 23 April. To make a payment, click here. 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.

Still paying separately for your business water and waste? You could be flushing your time and money down the drain.
But it doesn’t have to be that way. With Castle Water, combine water and waste to receive one simple bill – and save money in the process.

You choose…


We will credit your Castle Water account with £50, or we will send you a £50 Amazon e-voucher, or we will make a £50 donation to Save The Children (Charity registered in England and Wales (213890) and Scotland (SC039570))

Our guarantee

  • UK-based customer services and Account Managers
  • Extended opening hours from Mon – Fri, 8am – 6pm
  • Same scheme of charges and no disruption of supply
  • Pay simply with direct debit, protected by the Direct Debit Guarantee

Not an existing customer? You can still switch your services to Castle Water and receive £50 cashback. Click here.

Apply Now



Please use your supply address postcode. You can find your customer account number on your Castle Water bill. (e.g. CW1234567890 / TW1234567890 / PORT1234567890).

*Click here for full T&Cs. To find out more about this offer view our FAQs. Offer valid until 30 April 2019. Ref: CB50/06

Having difficulties?

Contact a member of our team or Skip to the next step

* The merchants represented are not sponsors of the Castle Water Cashback Offer or otherwise affiliated with Castle Water. The logos and other identifying marks attached are trademarks of and owned by each represented company and/or its affiliates. Please visit each company's website for additional terms and conditions.

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