The discovery of concentrations of forever chemicals has raised concerns about chooks and produce. Photo: Bianca De Marchi/AAP PHOTOS

Residents living in a forever-chemical hotspot are being asked about their home-grown produce and backyard chickens after high levels of the toxic substances were detected.

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The doorknocking campaign by environmental authorities followed new testing by Western Sydney University water scientist Ian Wright near contaminated dams and creeks in the Blue Mountains.

The water expert found the concentration of man-made PFAS (per- and polyfluoroalkyl substanc

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