Reporting pollution and blocked drains

Contact Thames Water on 0800 316 9800 immediately to report any leaks, blockages or overflowing drains

Reporting a blocked or overflowing drain

If you spot a drain that is blocked or has started overflowing, it is imperative you report it to us to prevent further sewage pollution. Overflowing or blocked drains can cause sewage to flow into rivers, causing water pollution. This is why it is so important to report any issue you may see and our pollution's team will investigate immediately, usually sending a technician to assess the problem.

 If it is a Thames Water drain that is leaking, we will take full responsibility to address it. This will involve the following actions:

  • Take immediate action to stop the pollution
  • Undertake a thorough assessment of the cause of the pollution and any environmental impact
  • Inform the Environment Agency of the incident - the Environment Agency regulates our activities and looks after rivers and watercourses in England
  • Clean up any affected areas
  • We will also do everything we can to make sure the problem is prevented from happening again

What we'll need to know

  • What you saw
  • When you saw it
  • Where you saw it, a postcode or road name is helpful but a note of any local landmarks or features will also help us locate the problem
  • If the problem is still happening and if sewage is still entering a watercourse

Also in this section

What causes sewer flooding? Sewer flooding: who to contact How we can help