Toxic ‘Forever Chemicals’ Found in Canadian Sea Otters, Raising Pollution Fears

Researchers from the University of British Columbia have detected alarming levels of toxic “forever chemicals,” or PFAS, in sea otters along the coast of British Columbia - signaling a growing environmental threat to marine ecosystems.

The study, published in Environmental Toxicology and Chemistry by Oxford University Press, analyzed liver and muscle samples from eleven deceased sea otters and found eight types of PFAS in every animal tested. The otters’ livers contained the highest concentrations, suggesting long-term accumulation of these persistent chemicals.

PFAS - widely used in non-stick coatings, waterproof materials, and firefighting foams - do not break down easily and can linger in ecosystems for decades. Scientists warn that these pollutants can damage organs, disrupt reproduction, and weaken immune systems in wildlife, while potentially entering the human food chain through seafood.

Because sea otters live near coastlines and consume fish, they serve as key indicators of marine health. Researchers plan to expand their studies to other marine mammals across Canada to monitor PFAS trends and guide future conservation policies.

The findings underscore the urgent need for global action to reduce chemical pollution and protect ocean life.

PFAS detection in every sampled sea otter - with liver concentrations indicating long-term accumulation - provides another data point in the mounting scientific evidence on the pervasive presence of forever chemicals in marine ecosystems. Sea otters are increasingly used as sentinel species for marine health because they live near coastlines, consume fish and are relatively easy to sample.

The regulatory implications are significant. As PFAS presence in seafood, drinking water and consumer products becomes better documented, regulatory action to restrict production and use - particularly of the more persistent long-chain PFAS - is accelerating globally. Companies with PFAS exposure across their products, supply chains or facilities face material transition risk.

For chemical manufacturers, consumer-goods brands, seafood buyers, water utilities and their insurers and financial advisors, Cognitud's sustainability due diligence, supply chain and operations and impact assessment teams help clients evaluate PFAS exposure across products and supply chains, structure substitution strategies aligned with emerging regulatory trajectories, and prepare disclosures aligned with CSRD, ISSB and jurisdictional chemical-management frameworks including REACH and Stockholm Convention.