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The Guardian - UK
The Guardian - UK
Environment
Rachel Salvidge

Race to find source of carcinogenic Pfas in Cumbria and Lancashire waters

Grass and trees beside a tranquil River Brathay in Cumbria on a sunny day
The contamination spans an area of outstanding natural beauty with multiple protections for wildlife and habitats. Photograph: David C Tomlinson/Getty Images

A string of toxic pollution hotspots has been uncovered across Cumbria and Lancashire, with high levels of the banned cancer-causing “forever chemical” Pfos detected in rivers and groundwater at 25 sites.

The contamination, spread across a large area, was uncovered by Watershed Investigations and the Guardian after a freedom of information request revealed high concentrations of Pfos in Environment Agency samples taken in January 2025.

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