Exclusive: High levels of banned ‘forever chemical’ have been detected in rivers and groundwater at 25 sites

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.