“Forever Chemicals” Increase by More Than 900 Percent in Svalbard Reindeer
For many visitors to Svalbard, the reindeer is among the first Arctic animals they encounter. Often seen grazing near Longyearbyen or moving slowly across the tundra beneath glaciers, these compact animals appear perfectly adapted to life in one of the world’s most remote environments.
Yet new research shows that even Svalbard’s endemic reindeer cannot escape the reach of industrial pollution.
A study led by researchers from the Norwegian University of Science and Technology (NTNU) and the University Centre in Svalbard (UNIS), in collaboration with Aarhus University and the Norwegian Institute for Nature Research (NINA), found that concentrations of PFAS — per- and polyfluoroalkyl substances — have increased dramatically in Svalbard reindeer over roughly the past decade.
PFAS are a large family of human-made chemicals used in products such as waterproof clothing, food packaging, non-stick cookware, cosmetics, industrial materials and firefighting foams. Because many of them break down extremely slowly, they are widely known as “forever chemicals”.
The new study, published in Environmental Science & Technology, analysed PFAS and heavy metals in Svalbard reindeer liver and muscle samples. Average PFAS concentrations in liver tissue increased from roughly 0.6 nanograms per gram a decade ago to 5.48 nanograms per gram today — an increase of more than 900 percent.
The increase surprised researchers. Lead author Malin Andersson Stavridis described the results as so unexpected that she initially thought they might be wrong.
The Svalbard reindeer is found nowhere else on Earth. Isolated from mainland populations for thousands of years, it has evolved into a distinct High Arctic subspecies. Unlike many other reindeer and caribou populations, Svalbard reindeer do not migrate over long distances. They remain within relatively small home ranges throughout the year, making them valuable indicators of environmental change in the terrestrial Arctic.
How Unusual Is This Increase?
An earlier circumpolar comparison of caribou and reindeer liver samples included animals from Canada, Greenland, Sweden and Svalbard. In that study, the Svalbard sample was small, only seven animals, and should therefore be treated as an indicative baseline rather than a precise long-term benchmark.
Still, the comparison is important. At the time, PFAS levels in Svalbard reindeer appeared relatively low compared with some other Arctic populations. The highest concentrations were recorded in caribou from Southwest Greenland, where PFAS contamination has also been linked to local sources such as airports and former military infrastructure.
Seen against that background, the new results are striking. A population once considered relatively lightly contaminated now shows PFAS concentrations that are high compared with many previously studied Arctic reindeer and caribou populations.
The absolute concentrations remain below known toxicity thresholds for wildlife, and the study does not suggest an immediate threat to the Svalbard reindeer population. But in environmental monitoring, the speed and direction of change can be just as important as the concentration itself.
In Svalbard, the trend is clearly moving upward.
A Shifting Chemical Fingerprint
One of the most important findings is not only that PFAS levels have increased, but that the chemical profile has changed.
Previous PFAS contamination on Svalbard had often been associated with local sources, including firefighting-foam training areas and landfill sites near Longyearbyen. These sources are well known because firefighting foams historically contained PFAS compounds that can persist in soil, meltwater and groundwater.
However, the pattern found in the recent reindeer samples differs from earlier local-source findings. The contamination is now dominated by PFOS (perfluorooctane sulfonate) and several long-chain PFCAs (perfluoroalkyl carboxylic acids) — compounds known for their persistence and tendency to accumulate in wildlife.
In simpler terms: not only the amount of PFAS has changed, but also the type.
This chemical fingerprint suggests that long-range transport may be playing a larger role than local contamination alone. PFAS released in industrial regions can travel north through air currents, ocean circulation and migrating water masses. Once in the Arctic, these chemicals may accumulate in snow, ice, soils, vegetation and eventually wildlife.
Climate change may add another layer of complexity. Pollutants deposited in snow, glaciers and permafrost can remain stored for years or decades. As glaciers retreat and permafrost thaws, some of these legacy contaminants may be released back into the environment.
Researchers caution that further studies are needed before a direct causal link can be established. However, the findings add to growing concern that climate-driven environmental change could remobilise pollutants already present in Arctic ecosystems.
No Immediate Threat, but a Clear Consumption Guideline
The study did not find evidence that current PFAS levels pose an immediate population-level risk to Svalbard reindeer. Measured concentrations remained below known toxicity thresholds for wildlife.
Nevertheless, the researchers observed changes in genes associated with energy metabolism. Such biological responses do not necessarily translate into visible health effects, but they can act as early warning signals.
For an Arctic animal that relies on careful seasonal energy balance — building fat reserves during summer and surviving long periods of limited food availability in winter — even subtle metabolic stressors may become relevant over time.
The study also found that concentrations of some heavy metals, including cadmium, lead and mercury, have remained stable or decreased compared with historical levels. In that sense, PFAS stand out as the contaminant group showing the clearest recent increase.
What Does This Mean for People?
For residents and visitors, the findings are not considered a reason for alarm regarding drinking water or general public health in Longyearbyen.
However, the study does carry one practical implication for people who hunt or consume Svalbard reindeer. Based on the measured PFAS concentrations, researchers estimated that a person could safely consume no more than approximately 11.5 grams of reindeer liver per week, averaged over a year, without exceeding recommended PFAS exposure thresholds.
Muscle meat was not identified as carrying a comparable concern. Still, the liver guideline provides a useful benchmark for hunters and residents interested in local food safety.
Part of a Larger Story
The results contribute to a growing international debate about PFAS contamination. Across Europe, regulators are evaluating broad restrictions on thousands of PFAS compounds because of their persistence, mobility and potential effects on ecosystems and human health.
Scientists increasingly view PFAS as one of the major pollution challenges of the 21st century. Despite regulatory restrictions on some compounds, many PFAS continue to circulate globally and accumulate far from their original source.
The increase observed in Svalbard is particularly notable because it occurred during a period when many PFAS compounds have already been subject to international restrictions and phase-outs.
The findings therefore tell a larger story. Even in one of the planet’s most remote inhabited regions, chemicals released thousands of kilometres away — and potentially pollutants stored for decades in snow, ice and permafrost — are finding their way into Arctic food webs.
The study serves as a reminder that no part of the Arctic is truly isolated from global environmental pressures. Even species found nowhere else on Earth remain connected to decisions, emissions and pollutants originating far beyond the horizon.
Further Reading
Original Study
Stavridis et al., Seasonal Shift in Exposure and Accumulation of PFAS and Heavy Metals in High Arctic Reindeer, Environmental Science & Technology, 2026. DOI: 10.1021/acs.est.5c11066
PFAS at a Glance
PFAS
A family of thousands of synthetic chemicals used in products that resist water, grease, stains or heat.
Why are they called “forever chemicals”?
Many PFAS break down extremely slowly and can remain in the environment for decades.
Where are they found?
Waterproof outdoor clothing, food packaging, non-stick cookware, cosmetics, industrial products and firefighting foams.
PFOS
One of the most common and well-studied PFAS compounds. Although restricted in many countries, it remains widespread in the environment.
PFCAs
A subgroup of PFAS known for persistence and accumulation in wildlife.
How do PFAS reach Svalbard?
Through atmospheric transport, ocean currents and potentially the remobilisation of pollutants stored in snow, glaciers and permafrost.
Why does it matter?
PFAS have been detected throughout Arctic ecosystems — in snow, seawater, fish, seabirds, marine mammals, polar bears and increasingly in reindeer.
PolarJournal, Lisa Scherk
