How Much Does Thames Water Cost in the UK?
Thames Water charges the average household around £35 per month for water and sewerage services. Thames Water is the UK's largest water company, supplying water to approximately 15 million people across London and the Thames Valley. Unlike energy, water prices in England and Wales are set by the water industry regulator Ofwat, and you cannot switch your water supplier.
| Service | Typical Monthly Cost | Billing Method |
|---|---|---|
| Unmetered (rateable value) | £35–£45 | Fixed annual charge |
| Metered | £25–£40 | Based on actual usage |
| WaterSure (capped tariff) | £25 | For eligible households |
Thames Water bills are set annually and typically increase each April in line with Ofwat's price review determinations. According to Water UK, the average UK water and sewerage bill was £448 per year in 2025-26. Thames Water's charges tend to be higher than the national average due to the costs of maintaining London's ageing Victorian infrastructure.
For a full comparison of UK utility costs, see our guide to UK Utilities subscriptions.
Does Thames Water Auto-Renew?
Yes, Thames Water charges continue automatically. If you pay by direct debit, payments are taken monthly or twice yearly depending on your payment plan. Thames Water reviews your bill annually, with new charges typically taking effect each April.
Metered customers receive bills based on actual water usage, read from your meter every six months. Unmetered customers pay a fixed annual charge based on the rateable value of their property. You can request a water meter from Thames Water for free — Ofwat data shows that metered customers typically pay less than unmetered customers.
Thames Water sends annual bill notifications in February or March, giving you time to review charges before the new billing year begins in April.
How to Cancel Thames Water
You cannot cancel or switch your water supplier. Water supply is a regional monopoly in England and Wales — Thames Water is the only water company serving London and the Thames Valley. However, there are ways to reduce your bill.
Options to lower your Thames Water bill
- Apply for a water meter — free installation, often reduces bills for low-usage households
- WaterSure scheme — caps bills for metered customers receiving qualifying benefits with either 3+ children or a medical condition requiring high water use
- Payment holidays — Thames Water offers short-term payment breaks for financial hardship
- Social tariffs — reduced rates for qualifying low-income households
- Check for leaks — a running leak increases metered bills significantly
If you are moving house and leaving the Thames Water supply area, contact Thames Water with your moving date. They will issue a final bill and close your account. Your new home will be supplied by whichever water company covers that region.
For information on water suppliers outside London, see our guides to United Utilities and Severn Trent.
Is Thames Water Worth It in 2026?
Thames Water is your only option for water supply in London and the Thames Valley — you cannot switch to another provider. The company has faced criticism for its financial position and environmental record, but regulatory oversight from Ofwat ensures pricing is controlled.
| Pros | Cons |
|---|---|
| Regulated pricing set by Ofwat | Cannot switch to an alternative supplier |
| Free water meter installation available | Higher than average UK water bills |
| WaterSure tariff for vulnerable households | Company has faced financial difficulties |
| Direct debit payment spreads cost evenly | Sewage discharge incidents have drawn criticism |
| Online account for managing bills and readings | Customer service ratings below industry average |
Thames Water's financial position has been widely reported in the media. As a customer, your water supply is guaranteed regardless of the company's financial situation — Ofwat has legal mechanisms to ensure continuity of service. Focus on reducing your bill through metering and checking for leaks.
Track Your Thames Water Subscription with Prunely
Prunely lets you add your Thames Water bill to see exactly when your next payment falls. Set custom reminders so you get an alert before you are charged. Track your water costs alongside all your other subscriptions — energy, broadband, insurance, and more — without connecting a bank account. Prunely is free for up to 5 subscriptions.
Frequently Asked Questions
How much does Thames Water cost per month?
Thames Water charges the average household around £35 per month for water and sewerage. Metered customers may pay less depending on usage. Annual bills are set by Ofwat and typically change each April. Thames Water's bills are above the national average due to London infrastructure costs.
Can I switch my water supplier from Thames Water?
No, water supply is a regional monopoly in England and Wales. You cannot choose your water supplier — it is determined by where you live. Thames Water supplies London and the Thames Valley area. This is different from energy, where you can freely switch suppliers.
Should I get a water meter from Thames Water?
A water meter is usually beneficial if you use less water than average — typically single-person or two-person households. Thames Water installs meters for free. You have 12 months to switch back to unmetered billing if your bills increase. Ofwat data shows metered customers pay less on average.
What is Thames Water's WaterSure scheme?
WaterSure caps metered water bills for households receiving qualifying benefits who either have three or more children under 19 or a member with a medical condition requiring high water use. The cap is set at the average metered bill for your region.
How do I track my Thames Water spending?
Add your Thames Water direct debit to Prunely to track payments alongside all your other subscriptions. You can also manage your account online at thameswater.co.uk, where you can submit meter readings, view bills, and set up or adjust direct debit payments.