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Mystery foam on river in Thetford sparks Environment Agency investigation

The Environment Agency identified the pollution source causing foam and fish deaths on the river Thet; foam levels are expected to decrease naturally with upcoming rain.

  • On Saturday, a large volume of foam filled the river Thet in Thetford, prompting Emergency services and passersby to find small dead fish after pollution reports.
  • The Environment Agency said it has detected the source and expects rain to dilute the foam, while a spokeswoman recalled a December 23 2024 incident with an unidentified source.
  • Norfolk Fire and Rescue joined the Environment Agency at School Lane, arriving around 10.20am and leaving at 1.45pm while fisheries officers attended and the agency asked the public to report any fish in distress.
  • Authorities warned the public to avoid entering the water and to keep dogs away from visible foam, as the Environment Agency said no safe dispersal method exists and rain dilution will reduce it naturally.
  • A prior December 23 2024 foam event raises questions about recurrence and source identification, while Anglian Water has been asked for comment as the Environment Agency monitors for a possible second plume.
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BBC News broke the news in United Kingdom on Saturday, October 18, 2025.
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