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Changing your account details
It is important that you advise us of any changes that you wish to make to your account, such as changing your contact details or bank account details (if it will affect your Direct Debit payments).
Online account
The quickest and easiest way to let us know of any changes you wish to make is through your online account.
Sign in to update your mailing address, email address and contact number instantly.
Register for an online account
Already signed up? Log in here
Online forms
If you're not ready to sign up to an online account but would like to update your mailing address, please fill in our dedicated form.
Alternatively, you can contact us.
Adding account holders
When adding additional named account holders, we need permission from the person being added to the account.
If the main named account holder leaves your property, we require notification from a named account holder who is staying at the property.
If the people remaining at the property are not currently named account holders, you will need to contact us.
Amending your name on the account
If you have changed your name or you've noticed your name is spelt wrong on your bill, please call us on 0800 980 8800.
Our lines are open from 8am to 8pm, Monday to Friday, 8am to 6pm Saturday and closed on Sunday and bank holidays.
Power of attorney
If you are granted power of attorney, please send copies of all supporting documents, such as a copy of a solicitor's letter, to:
Thames Water
PO BOX 286
Swindon
SN38 2RA
We will then update the named account.