Stanlow refinery pollution breaches under investigation after dozens of limit exceedances

One of the United Kingdom's largest oil refineries is under investigation after documents suggested it repeatedly exceeded pollution limits in 2023 and 2024. The Stanlow refinery in Ellesmere Port, Cheshire, is said to have released toxic chemicals and oil into local rivers, the Mersey Estuary and groundwater on dozens of occasions. The Environment Agency has confirmed it is investigating the alleged breaches.

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The documents indicate that permitted levels for chemical releases were exceeded hundreds of times over the two-year period, with the regulator determining that EET Fuels broke permit conditions 58 times. The company, which runs the site and was formerly known as Essar, said it takes its environmental responsibilities seriously. Stanlow holds a permit to operate the refinery, which allows controlled discharges of oil and chemicals but also requires efforts to limit pollution and harm.

The reported spills included cyanide, benzene and heavy oils, according to the documents. They are said to have affected waterways including Thornton Brook and the River Gowy, which flow into the River Mersey Estuary. The estuary is designated a Site of Special Scientific Interest and is home to endangered species, including dolphins and rare birds.

The refinery's scale gives the case wider significance for the UK's fuel system. Stanlow is one of only four remaining refineries in the country and processes about 10 million tonnes of crude oil each year, producing around 18% of the fuel used for road transport. Any regulatory action or operational disruption at the site could therefore have implications beyond Cheshire, even though the current case is focused on environmental compliance.

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The investigation also follows earlier legal action involving the same operator. EET Fuels pleaded guilty this year to 12 charges of breaching environmental law between 2018 and 2020. That history is likely to shape scrutiny of the new allegations, particularly because the latest documents suggest repeated problems over a more recent period.

Environmental groups have long argued that pollution in and around the Mersey Estuary has consequences for wildlife and habitat recovery. The documents cited by investigators describe releases into an area that supports feeding and roosting birds, as well as marine life including dolphins. The case therefore sits at the intersection of industrial energy production, environmental protection and regulatory enforcement.

What remains unclear is the outcome of the Environment Agency's investigation and whether it will lead to further enforcement action. It is also not yet clear how the regulator will assess the scale of any harm caused by the alleged breaches, or whether the company will face additional penalties. The key issue now is whether the findings in the documents are confirmed and what steps, if any, will be required to prevent further pollution at the site.

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