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If you need to set up a new account or are moving to a new property within or outside of our supply area - it's easy to tell us all about your move online, at a time that's convenient to you.
If you are a business customer, please take a look at our Businesses pages.
Please call us on 0845 9200 888.
Our lines are open from 8am to 8pm, Monday to Friday, from 8am to 1pm on Saturday and closed on Sunday and bank holidays.
If you are calling from outside the UK, please call +44 1793 366 011. To help us continually improve the quality of our service, we record all calls.
If you would just like to change your mailing address, you can send us an email using our online form:
We will respond to your email within five working days.
If you would prefer to send us a letter, and if you are an existing customer, please quote your Thames Water account number (printed at the top of your bill) when you write to us at:
PO Box 286
We will respond to your letter within five working days.