Policy paper

Thames: groundwater situation

The latest update on monitored groundwater levels and whether there are any groundwater alerts or warnings in force.



This document provides information on the groundwater situation for:

  • West Berkshire
  • Wiltshire
  • Surrey
  • Windsor
  • Maidenhead
  • north east Hampshire
  • Buckinghamshire
  • Vale of White Horse

Flooding from groundwater can happen when the level of water within the rock or soil that makes up the land surface (known as the water table) rises. The level of the water table changes with the seasons due to variations in long term rainfall and water abstraction. When the water table rises and reaches ground level, water starts to emerge on the surface and flooding can happen.

Lead local flood authorities (the unitary or County Council) are responsible for managing the risk of flooding from groundwater. They set out how they plan to do this in their local flood risk management strategies.

The Environment Agency has a strategic overview for all sources of flooding including groundwater. This means they will provide support to other risk management authorities. They supply information in the form of monitored groundwater levels. In some areas that have historically experienced groundwater flooding, the Environment Agency provide a groundwater alert or warning service.

Published 28 March 2014
Last updated 13 January 2020 + show all updates
  1. Updated with briefing dated 13 January 2020.

  2. Briefing note dated 6 January 2020 added.

  3. Added the latest update (30 December 2019).

  4. Briefing note dated 23 December 2019 added.

  5. Latest information added - dated 16 Dec 19.

  6. Briefing note dated 10 Dec 2019 added

  7. 4 December update

  8. Thames West area groundwater update: 26 November 2019

  9. Latest briefing note 19 Nov 2019

  10. New report for 13 November added.

  11. Latest report added - 7 June 2018.

  12. Latest report added.

  13. Latest report added.

  14. 10 May report added.

  15. Updated groundwater briefing note.

  16. Latest document added.

  17. Added updated groundwater report.

  18. April 2018 report added.

  19. updated the PDF

  20. New report added.

  21. New report added.

  22. New briefing added.

  23. New report for November 2014 added.

  24. The latest update on monitored groundwater levels in the West Thames area.

  25. New briefing added on 22 May 2014.

  26. New briefing added for 16 May 2014.

  27. New data added for 9 May 2014.

  28. New briefing added for 2 May 2014.

  29. The latest briefing note for the West Thames area has been updated today - 25/04/2014

  30. New briefing for West Thames added 17 April 2014.

  31. New briefing for 11 April 2014.

  32. New briefing added for 11 April 2014.

  33. New PDF added for 4 April 2014.

  34. First published.