Water companies
Thames Water phone numbers
Edited by Richard BarkerChecked 13 October 2026 to 14 October 2026
Thames Water publishes 2 numbers for you to call and 3 numbers it says it may call you from on its own website. We list each one with the page it is on (3 pages in all), a short quote from that page and the date we checked it.
Numbers Thames Water says it may call you from
Thames Water lists these 3 numbers on its own website. A call showing one of them is not proof it is Thames Water, because numbers can be faked.
- 0800 009 3815
They may call you from this number
Number Thames Water may call from about outstanding debts
Source: “We may call from 0800 009 3815, 0800 009 3615 or 0800 009 3806” (opens in a new tab). Checked 14 October 2026.
- 0800 009 3615
They may call you from this number
Number Thames Water may call from about outstanding debts
Source: “We may call from 0800 009 3815, 0800 009 3615 or 0800 009 3806” (opens in a new tab). Checked 14 October 2026.
- 0800 009 3806
They may call you from this number
Number Thames Water may call from about outstanding debts
Source: “We may call from 0800 009 3815, 0800 009 3615 or 0800 009 3806” (opens in a new tab). Checked 14 October 2026.
Numbers to call Thames Water
What each line is for, as Thames Water describes it, with opening hours where it gives them.
- 0800 980 8800
You call them on this number
Billing, account, payments, moving home and water meter enquiries
Hours: Monday to Friday 8am to 8pm, Saturday 8am to 6pm
Source: “Call us Monday to Friday 8am-8pm, and Saturday 8am-6pm. 0800 980 8800” (opens in a new tab). Checked 13 October 2026.
- 0800 316 9800
You call them on this number
Water supply, low pressure, sewer and flooding problems
Hours: 24 hours a day, 7 days a week
Source: “You can call our friendly customer service team 24/7 on: 0800 316 9800” (opens in a new tab). Checked 13 October 2026.
How scams that copy water companies work
UK Finance says criminals pose as organisations such as utility companies, claiming you must settle a fine, pay a bill or return a refund paid by mistake. Check your account through the water company’s own website or the number on your bill.
This could still be a scam call
Criminals can make their number look like a genuine one (this is called spoofing). If someone calls from this number and asks for money, bank details, a code or passwords, hang up. Then call Thames Water back on a number you've found yourself, such as the one on their own website or on a letter or bill from them.
Safe ways to check
- Thames Water's own contact page (opens in a new tab): Where this number is published.
- Report Fraud (opens in a new tab): Report fraud and cyber crime in England, Wales and Northern Ireland. In Scotland, call Police Scotland on 101.
- Forward scam texts to 7726 (opens in a new tab): It is free, and reports the message to your mobile provider.
- How number spoofing works: Why a genuine number on your screen does not prove who is calling.
Questions about Thames Water’s numbers
Which numbers does Thames Water say it calls from?
Thames Water lists 3 numbers on its own website as numbers it may call you from, including 0800 009 3815, 0800 009 3615, 0800 009 3806. Each one is in the table on this page with its source. Callers can fake a genuine number, so if you are unsure, hang up and contact Thames Water on a number you have found yourself.
What numbers can I call Thames Water on?
Thames Water publishes 2 numbers for the public to call. They are: 0800 980 8800 (Billing, account, payments, moving home and water meter enquiries); 0800 316 9800 (Water supply, low pressure, sewer and flooding problems). Check the source page for each one before you call, as numbers and opening hours change.
Does Thames Water publish a number on its own website that is not listed here? Suggest a number for Thames Water.
Sources and checks
This page relies on:
- Thames Water: thameswater.co.uk/contact-us/bill-and-account/help-paying-your-bill
- Thames Water: thameswater.co.uk/contact-us/water-supply/no-water-low-pressure
- Thames Water: thameswater.co.uk/about-us/confidence-in-communications
Checked on 13 October 2026 to 14 October 2026. Read how we build the directory. How we check our information. Spotted a mistake? Tell us and we will put it right.