United Utilities has been fined £60,000 after pleading guilty to releasing thousands of fish into Bessy Brook, near Bolton, without a permit. The Environment Agency (EA) said it is the first time a water company has been sentenced under the Keeping and Introduction of Fish (England and River Esk Catchment Area) Regulations 2015. The court also ordered a £2,000 victim surcharge and £24,098.06 in costs. (gov.uk)

The case centres on a scour valve test at High Rid Reservoir on 12 December 2024, when more than 30,000 fish were swept downstream. Over 16,000 died from the high‑speed discharge and trauma; around 18,000 were rescued and returned to the reservoir. Officers found fish embedded in bridge walls, with others showing severe injuries. (gov.uk)

EA officers visited Bessy Brook on 13 December 2024 after reports of dead fish. Sampling confirmed no chemical pollutants in the brook. United Utilities told investigators a large shoal of roach likely entered the scour pipework to evade predators, but crucially the company lacked the permit required to introduce fish to the downstream watercourse at such scale. The incident was classed as ‘Category 2’ harm, meaning significant adverse impact on animal health. (gov.uk)

In mitigation, the company outlined steps taken to stop a repeat and confirmed a subsequent valve test had been completed safely. It also made a voluntary £500,000 donation to Groundwork Greater Manchester for proposed Middle Brook restoration work. The court nonetheless ruled on the fine, reinforcing the need for full compliance across all water operations. (gov.uk)

Regulators framed the case as a clear message. The EA said water companies must meet every legal requirement, and that enforcement will be robust where they fall short. Ministers added that reforms will enable a stronger regulator with MOT‑style checks of water assets, so failures are prevented before they cause ecological damage. (gov.uk)

Why this matters goes beyond one brook. The 2015 rules exist to manage ecological risk from moving or releasing fish, including disease spread, genetic impacts and sudden shocks to small watercourses. Applying them to a reservoir test for the first time signals that operations work-such as scour tests-will now be treated with the same ecological care as deliberate restocking or transfers. (legislation.gov.uk)

The case lands amid a step‑up in oversight. In 2025/26 the EA completed more than 10,000 inspections of water company assets-up from 4,600 the year before-issuing thousands of improvement actions, while expanding its enforcement workforce with record funding. That sharper scrutiny is beginning to shift behaviour across the sector, according to the agency. (gov.uk)

For operators, the lesson is practical: treat asset testing days as ecological risk days. That means fitting or checking fish screens where feasible; pre‑test sweeps and fish‑rescue readiness; controlled ramp‑up and ramp‑down of flows; scheduling outside periods of stress such as low flows; and notifying the EA early where permits may be required. These are low‑regret measures that protect wildlife and reputations alike.

For communities, the fine underscores both accountability and progress. England’s rivers still face heavy pressure-government data and The Rivers Trust report show very low rates of good ecological and chemical status-but stronger inspection regimes and targeted restoration funding are tangible levers for improvement. Public reporting remains vital to trigger fast responses. (gov.uk)

If you see dead fish, distressed wildlife or suspected pollution, call the EA’s 24/7 incident hotline on 0800 80 70 60. In the meantime, this ruling sets a clear precedent: even routine engineering work must be planned with living rivers in mind. (gov.uk)