750,000 Tons Of Toxic Leachate From Landfills Mixed W. Sewage Sludge, Sprayed On UK Farms Every Year

More than 750,000 tonnes of liquid from landfills are mixed with sewage at water treatment works and spread on farmland across England each year, it can be revealed. Generated by hundreds of landfills across the country, leachate – the liquid that drains through landfill waste carrying a cocktail of chemicals – is regularly tankered to sewage treatment works, where it mixes with domestic sewage and industrial effluent to create sludge, also described as “biosolids”.

The process produces treated liquid, discharged into rivers and seas, and solid sludge, sold by the water companies to farmers as fertiliser. But many toxic chemicals escape treatment, ending up in waterways or accumulating on fields. Currently all of England’s rivers fail to meet legal standards for chemical pollution.

Analysis by the Guardian and Watershed Investigations shows about 3.5m tonnes of leachate are generated each year, with more than 750,000 tonnes sent to sewage works unable to deal with chemicals found in leachate such as Pfas “forever chemicals”, some of which are carcinogenic, as well as PCBs, dioxins, flame retardants, solvents, endocrine disruptors, microplastics and other hazardous chemicals. “Some of these wastes simply shouldn’t be going into sewage treatment works – it’s basically a form of laundering,” an Environment Agency source who did not wish to be named said. “You lose the leachate in bulkier material to dilute and disperse it.”

Forensic scientist and Pfas expert Dr Dave Megson said he was “amazed that this was happening”, having assumed it was only “a relatively minor practice” under strict controls. “It seems like the whole system is out of control,” he said, saying that most sewage plants were designed for human waste, not chemical effluents, and that adding large volumes of leachate could “disrupt the efficiency of treatment sites” and make them less effective.

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https://www.theguardian.com/environment/2025/sep/12/toxic-landfill-liquid-sewage-spread-farms-england