Login Menu Universal Credit changes: If you are affected by this, click here Setup or Amend a Direct Debit Use this service to provide an instruction to your bank or building society to pay your water bill by Direct Debit. A Direct Debit offers you a choice of payment dates and you can spread your bill over instalments at no extra cost. Please click here to view our Direct Debit Guarantee. Service user number 997542. PLEASE NOTE: If you choose a date to pay your bill by Direct Debit and it is within the next two weeks. This payment will be taken the following month. You will need Your Welsh Water account reference number This can be found in the top right corner of your bill Bank details Bank account number and sort code Permission from account holder If applicable I'll come back later Take me to the service Legal Notice Data Protection Anti-Slavery Statement Privacy Policy Social Media Privacy Notice Dŵr Cymru Cyf, a limited company registered in Wales No. 2366777. Registered office: Linea, Fortran Road, St Mellons, Cardiff, CF3 0LT. © Dŵr Cymru Cyf Our use of cookies As a not for profit organisation, we use cookies to help us understand how we can improve our services to you. You can manage your cookie preferences at any time on our Cookie Policy page. Manage preferences Reject Non-Essential Cookies Allow all cookies