Environment Agency investigation continues into River Thet pollution incident which killed around one thousand young fish in October 2025.
An investigation into a major pollution incident which killed an estimated 1,000 juvenile fish in the River Thet is still ongoing, a year after the incident first caused concern in Thetford.
The Environment Agency has confirmed that inquiries are continuing into the pollution, which saw large quantities of white foam appear on the surface of the river in October 2025.
The unusual substance was spotted covering stretches of the waterway through the town centre, prompting an urgent response from environmental officers.
Specialist teams attended the scene to collect samples, investigate the contamination and establish where the discharge had originated.
The agency says the source was identified at the time and action was taken to prevent any further discharge into the river.
However, the incident had already affected wildlife, with approximately 1,000 young fish believed to have died.
Residents were initially advised to avoid entering the affected water and to prevent pets from swimming or drinking in areas where the foam was visible.
The Environment Agency says its investigation remains active and decisions about possible further action are still being considered.
In December 2025, approximately 3,000 healthy fish were released into the River Thet as part of efforts to help restore fish populations following the pollution incident.
The investigation continues as concerns remain about protecting the river's wildlife and preventing similar incidents in the future.
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