A Cornish farmer has been ordered to pay £3,765 after a digestate spill on his land caused a major fish kill in the River Ottery. At Truro Magistrates' Court, Norman Osborne, 57, of Tobarn, Jacobstow, pleaded guilty to causing a water discharge activity after pollution from his farm near Warbstow reached the river in 2022. The total included a £215 fine and £3,550 in Environment Agency costs. The penalty was limited in cash terms, but the river impact was not. This was a local pollution event with visible ecological damage, and the court heard that its effects were still being felt two years later.

According to the Environment Agency, officers were called on 22 May 2022 after reports of dead fish in the River Ottery. Their investigation found that about 2,300 gallons of digestate had entered the watercourse from a tank on Osborne's farm. The court heard that Osborne had been transferring digestate from a tank to a tanker so it could be spread on farmland when a connecting hose broke. What followed was a sharp reminder of how quickly a routine farm task can become a river pollution incident when containment fails.

Digestate is the wet, slurry-like residue left after the anaerobic digestion of food waste and other organic material. It is commonly used as a fertiliser, but it becomes highly dangerous to rivers and streams once it escapes into open water because ammonia and nitrogen levels can be very high. In this case, the spilled digestate ran down the road and into a nearby watercourse. The court also heard that the pollution was made worse when the escaped material was washed into the watercourse, and that Osborne did not report the incident to the Environment Agency.

The ecological damage stretched across 3.5km of watercourse. Environment Agency officers found sludge and microplastics in the polluted reach, counted 471 dead fish and estimated that the true toll was 1,610. Those losses included Atlantic salmon, brown trout and bullheads. These are not just names on a case file. They are species that help show whether a river is functioning well, and their sudden loss points to a sharp fall in water quality and oxygen conditions after the spill.

The most sobering detail came from the longer view. The court heard that even two years after the incident, fish populations had still not returned to historic levels. River recovery can be slow after a severe pollution event, especially where sensitive species are hit early and across a long stretch of channel. That matters beyond one farm and one prosecution. Smaller rivers and tributaries support wider catchments, connect habitats and help sustain fish populations over time. Damage to one reach can weaken the health of the whole watercourse.

The Environment Agency said the case showed why rapid reporting matters when pollution happens. Early contact gives officers a chance to advise on containment, reduce the spread of pollutants and protect whatever wildlife remains downstream. For farms using digestate, the lesson is practical rather than abstract. Storage tanks, transfer hoses and loading areas need close attention, and any release must be treated as an emergency, not washed away or left unreported. In river protection, prevention remains far more effective than trying to repair the damage later.

Osborne was charged with one offence of causing a water discharge activity on 20 May 2022 under the Environmental Permitting (England and Wales) Regulations 2016. The legal breach was specific, but the wider message is plain: a common farm input escaped, a nearby river absorbed the impact and wildlife paid the price. Cases like this show where enforcement is useful, but also where it is not enough on its own. Accountability matters, yet lasting river protection depends on better handling of high-risk materials, faster incident reporting and steady monitoring so damaged waterways have a real chance to recover.