The pollution of our rivers has come under heavy scrutiny in recent months, with much of the focus on how water companies discharge sewage.
But farming also plays a significant role – with run-off from fertilisers and pesticides.
An investigation by Channel 4 News can reveal that there have been more than 1,300 breaches of the rules brought in to deal with water pollution from agriculture but not a single prosecution.
The Environment Agency says they take a proportionate approach that uses advice and guidance first.