More than 840 litres of harmful chemicals have been collected from farms in the area.
A pesticide amnesty has taken place across Devon and Cornwall to help protect the environment, South West Water has said.
The work, which was funded by the water company, encouraged the amnesty of unwanted, outdated or banned chemicals to prevent them from accidentally entering the environment. Annabel Martin, head of land management at Westcountry Rivers Trust, said the service enabled farmers to "do the right thing" without risk to themselves.
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