A £3,000 fine, a £15 Offenders Levy and £1,929.80 in remediation costs — that is the price John Stewart of Boyland Road, Ballymoney, will pay after a slurry spill from his Co. Antrim farm killed fish across two rivers.

Coleraine Magistrates' Court convicted Stewart under Article 7(1)(a) of the Water (Northern Ireland) Order 1999 after he pleaded guilty to the water pollution offence. The case stems from a single point of failure on his slurry handling system: a valve on an above-ground slurry storage tank.

What happened on February 3, 2025?

Inspectors from the Northern Ireland Environment Agency (NIEA) responded that day to a report of a significant slurry pollution incident affecting the Greenshields River, a tributary of the Ballymoney River in Co. Antrim.

Their investigation established the sequence of events. The valve on the above-ground slurry storage tank failed. Slurry escaped, flowed through a cattle shed, crossed the farmyard and adjacent fields, and entered the Greenshields River at a number of locations.

Stewart and his family took immediate action to stop further release of slurry and limit its impact. The court heard this plainly. It did not prevent the damage.

How far did the pollution travel?

Approximately 9km downstream from its source. Sampling by NIEA inspectors confirmed the pollution affected both the Greenshields River and the Ballymoney River.

Inspectors observed significant pollution within the impacted waterways and confirmed the incident resulted in a fish kill.

NIEA collected a statutory sample for analysis as part of the investigation. The results confirmed the presence of "poisonous, noxious or polluting matter, which had the potential to cause harm to aquatic life in the receiving watercourses" — the statutory language that anchored the prosecution under the 1999 Order.

Why does one failed valve cost this much?

The conviction shows how a mechanical failure on slurry infrastructure converts directly into criminal liability, a fish kill, and a remediation bill — even where the farmer responds quickly and cooperates. The £3,000 fine sits alongside the £15 Offenders Levy, and Stewart also agreed to repay fish kill remediation costs of £1,929.80.

The case also demonstrates the reach of a single discharge. Slurry entering a watercourse at several points along a farm's boundary travelled roughly 9km and affected two named waterways. Downstream impact, not just the volume lost at the tank, drives the severity of the outcome.

For livestock farmers, the mechanics of the failure matter. An above-ground slurry store depends on its valve. The court heard no allegation of deliberate discharge — this was an escape after a component failed. The offence under Article 7(1)(a) does not require intent; the escape itself, and its consequences, triggered the charge.

What should farmers watch next?

NIEA continues to prosecute pollution incidents under the Water (Northern Ireland) Order 1999, and this case confirms that a guilty plea, prompt on-farm action and an agreement to repay remediation costs still result in a conviction, a fine and a levy. Farmers running above-ground slurry stores should treat valve and outlet inspection as a scheduled maintenance item — the next NIEA prosecution report will show whether enforcement levels hold.