Watch Cary Johnston's full report from Oxford Crown Court
Interviewees: Robert Davis, Environment Agency & Richard Aylard, Director, Thames Water
Thames Water has been fined £2 million after raw sewage killed around 150 fish.
Raw sewage was allowed to seep into water at Milton-Under-Wychwood, south of Chipping Norton, in August 2015.
The sewage also flooded a nearby garden.
The fine will be reduced by £200,000 if Thames Water donates £200,000 to chosen wildlife charities within 56 days.
The court heard that numerous failures in the management of a sewage pumping station operated by the company led to the pollution.
Sewage created by two villages emptied a tributary of the River Thames leading to the River Evenlode, a tributary of the River Thames, for up to 24 hours.
Judge Ross found Thames Water to have been “reckless”.
Officers from the Environment Agency discovered the entire local population of almost 150 bullhead fish had been killed by the toxic waste along a 50-metre stretch of water.
A backlog of raw sewage was forced into the water from a sewer pipe that could not hold it.
The court heard Thames Water disregarded more than 800 high-priority alarms needing attention within four hours, in the six weeks before the incident.
Another 300 alarms were not properly investigated, all of which would have pointed out failures with the pumping station.
Investigations by the Environment Agency revealed Thames Water was aware the pumping station failed five times in the 12 months up to and including the incident in August 2015.
Thames Water pleaded guilty at an earlier hearing.