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

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

*Click here for full T&Cs. To find out more about this offer view our FAQs. Offer valid until 31 July 2019. Ref: CB50/07 *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.