A sewage spill at Woodbury 18 months ago has cost South West Water £50,000 in fines and costs.
A judge says the company was negligent when it let raw sewage into a brook near the village.
The Enviroment Agency prosecuted the water and sewage firm after it found dead fish in the polluted stream.
It's the first problem since the Woodbury sewage works opened 10 years ago.
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