The Environment Agency has documented 243 violations of the “farming rules for water” since they came into effect in April 2018 - but there have been no prosecutions or fines issued to polluters.

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The region with the most breaches recorded was Devon and Cornwall, with 75, followed by Wessex with 52 .

The breaches the Environment Agency has recorded are a fraction of the actual number, according to conservation organisations.

said: “This legislation is being violated on a regular basis across the country by farms and virtually nothing is being done to monitor it or enforce it.”

“Even when the Environment Agency identifies breaches, they don’t have the resources to follow up. All of the effort put into crafting the rules and consulting on this issue has proven to be a complete waste of time.”

The legislation, which was first announced in November 2017, gives the Environment Agency the power to prosecute or fine individuals and companies found to be polluting waterways with contaminated runoff water, or acting in a way that creates a high risk of pollution.