Major food safety investigation finds most products comply with limits, but concerns remain about ubiquitous contamination
Swiss federal and cantonal authorities have concluded an in-depth check of close to 1,200 food products of animal origin for per- and polyfluoroalkyl substances, also known as “forever chemicals.” Results, announced in November 2025 by the Federal Office for Food Safety and Veterinary Affairs, FOSV, together with the Association of Cantonal Chemists, are reassuring yet a reason to continue being vigilant on food safety in Switzerland.
Key Findings: Limited Exceedances but Widespread Presence
Within the investigation, 889 samples of animal-based foods were tested: 401 meat samples, 282 egg samples, and 206 fish samples were collected from various companies throughout Switzerland and Liechtenstein. Of these, approximately 70% had their origin in Switzerland or Liechtenstein, while 30% were imported products.
The findings indicated that only seven samples, representing 0.8% of all the meat, fish, and egg products tested, had exceeded the authorized limits of PFAS. Specifically, it was observed that five beef samples, one sample each of chicken egg and fish, contained PFAS above maximum permissible limits. This relatively low percentage suggests that most of the food products on the Swiss market comply with current regulatory standards.
Besides the main animal products, the authorities examined 276 samples of milk and dairy products. No legal maximum values exist today for PFAS in these products; therefore, the authorities compared findings to guideline values set up by the European Union. PFAS were found in all tested dairy products; two milk samples and one yogurt sample showed concentrations exceeding the threshold recommended by the EU—approximately 2% of the examined dairy products.
Understanding PFAS Contamination Patterns
The study also showed some illuminating trends in terms of which kinds of foods had higher contamination levels. Beef, lamb, and game meat all had high levels of one of the more troubling chemicals in the PFAS class: perfluorooctanesulfonic acid, also known as PFOS. Regulators say this is due to the diet of these animals, mainly grass and hay, which may be contaminated through environmental exposure.
PFOS was also the most commonly detected PFAS chemical in eggs. The chemicals primarily enter the eggs via contaminated feed, water, or from chickens foraging on contaminated soil and grass. Significantly, the study found that farming practices correlated with PFAS concentrations: eggs from free-range chickens with larger outdoor access areas had higher concentrations than eggs from chickens in more confined systems of housing. This finding raises difficult questions related to how animal welfare practices should balance against contamination risks.
Regulatory Response and Enforcement Measures
For those samples that exceeded the maximum permissible limits, corrective measures were immediately ordered by the cantonal chemists to secure future compliance with the established limits. These interventions reflect Switzerland’s commitment to food safety, even while acknowledging that most products on the market meet current standards.
The Association of Cantonal Chemists announced that it would continue to monitor and inspect the outlets because, although this round of results was quite positive, PFAS contamination remains an ongoing challenge.
The bigger picture of PFAS contamination in Switzerland
The latest research builds on other disquieting findings related to PFAS contamination throughout Switzerland. Earlier in 2024, the Swiss canton of St. Gallen banned sales of beef from five farms due to very high PFAS levels in meat products. The source of this contamination was linked to a historical practice of using sewage sludge contaminated with PFAS on farmland, an application that was stopped in 2006 but whose legacy continues to affect Swiss agriculture.
The Swiss government has known of such soil pollution since 2021 in Eggersriet, a municipality of St. Gallen, but further investigations also detected hotspots in other municipalities like Mörschwil, Untereggen, Goldach, Altenrhein, and St. Margrethen. The canton put affected farms under strict measures, including site and laboratory testing, a ban on moving or excavating any earth, and advising farmers to use the local municipal drinking water for producing food and hydrating animals.
Moreover, the authorities in the canton of Zug prohibited sale and distribution of the pike and perch from Lake Zug as a result of their excessive contamination with PFAS-a particularly alarming development considering the status of Lake Constance as one of Europe’s most important drinking water reservoirs.
What are PFAS, and why do they matter?
The per- and polyfluoroalkyl substances are a class of several thousand poorly degradable synthetic chemicals that have been produced industrially over the past few decades. Compounds in this class include perfluorooctanoic acid, perfluorooctanesulfonic acid, perfluorononanoic acid, and perfluorohexanesulfonic acid, and several thousand associated compounds.
PFAS have been widely used in commercial and consumer products since the 1940s, including non-stick cookware, water-resistant clothing, food packaging, firefighting foam, and numerous industrial applications. Their molecular structure makes them extremely stable and resistant to degradation, earning them the nickname “forever chemicals.” Due to their persistence, they tend to accumulate in the environment and bioaccumulate through the food chain until they reach humans through diet, drinking water, and other routes of exposure.
Exposure to PFAS has been linked by research to various health issues, such as metabolic disorders, high cholesterol levels, immune system dysfunction, liver damage, thyroid problems, cancers, and developmental problems in children. The EFSA has also repeatedly called for more sensitive analytical methods and comprehensive monitoring of PFAS in food products.
Regulatory Framework of Switzerland
At the beginning of 2024, Switzerland established maximum levels for individual PFAS in foods of animal origin, including meat, fish, and eggs, in line with European Union legislation. Among the four priority substances-PFOS, PFOA, PFNA, and PFHxS-individual limits have been set as well as a sum. A transitional period was permissible, with products manufactured under the previous regime allowed to be sold until July 31, 2024.
However, there are currently no legal maximum values for PFAS in milk and dairy products in Switzerland; it therefore uses EU guideline values for comparison. Authorities are considering more stringent limits for different food groups in consultation with the EU, with possible changes to limits on drinking water from 2026.
Industry experts note that Switzerland often lags behind the EU in the regulation of PFAS, with tolerances sometimes significantly higher. The current testing program represents part of a larger European monitoring initiative, as EU Member States and food business operators have been instructed to monitor food for the presence of PFAS through 2025.
Human Biomonitoring Uncovers Widespread Exposure
The food testing results are consistent with alarming findings of human biomonitoring studies in Switzerland. A pilot phase of the Swiss Health Study tested serum samples of 630 adult participants for 30 legacy and emerging PFAS compounds. In a study published in March 2025, PFAS were found in every single blood sample tested; three compounds – PFOS, PFOA, and PFHxS – were detected in the blood of all 630 participants.
The geometric mean concentrations were 6.6 ng/mL for PFOS, 1.3 ng/mL for PFOA, and 1.2 ng/mL for PFHxS, collectively accounting for a total of 88% of measured PFAS. In about 5% of participants, PFOS levels were above health-related guidance values set by the German Human Biomonitoring Commission. Associations between levels of PFAS and various factors such as age, sex, fish consumption (especially freshwater), and breastfeeding duration were also noted in the study.
Unfortunately, the larger Swiss Health Study, which aimed at following 100,000 volunteers for a minimum period of 20 years with the purpose of assessing long-term health effects of PFAS and other chemical exposures, was discontinued in the year 2025 owing to budgetary constraints; this has really disappointed public health advocates who emphasize the need for long-term data on chemical exposure and health outcomes.
Industry Perspectives and Future Challenges
Industry representatives, while acknowledging contamination concerns, underscore the importance of PFAS in everything from semiconductor production to renewable energy generation, medical diagnostics, and precision machinery. They argue for substance-specific regulation rather than blanket restrictions, noting that of approximately 10,000 substances classified as PFAS under some definitions, only a fraction are used commercially in significant quantities.
Industry advocates argue that risk-based prioritization should be emphasized, considering the PFAS that actually enter the environment; careful consideration of whether PFAS-free alternatives are actually better or worse for human and environmental health; and more research regarding PFAS pathways and sources. There are still many open questions, such as whether historical contamination (e.g., sewage sludge applied pre-2006) or ongoing sources (e.g., consumer products entering into waste streams) represent the primary concern.
Outlook: Continued Monitoring and Prevention
The cantonal chemists’ association underlined the fact that, although the results are generally quite positive, this does not end the PFAS monitoring because there is such widespread, low-level contamination of these chemicals across all food classes. Detection of PFAS in every sample of dairy products, as well as elevations associated with certain production methods, like grass-fed livestock and free-range egg production, underlines the complexity of managing environmental contaminants that persist for decades or longer.
Food industries have to make investments in more specialized analytical methods including liquid chromatography and mass spectrometry to find even trace PFAS for stricter regulations resulting from alignment with EU standards. The recent contamination of fish throughout different water bodies in Switzerland underlines the urgent need for comprehensive environmental monitoring and remediation efforts, important even within such a critical drinking water reservoir as Lake Constance.
The current study provides valuable baseline data for assessing the effectiveness of Switzerland’s regulatory approach and highlighting areas that need further attention. While the low percentage of products exceeding limits might be reassuring, the omnipresence of these persistent chemicals along the food chain and environment indicates that PFAS contamination will continue to pose a substantial public health and environmental problem well into the future.
Note: For the most recent information on PFAS regulations and guidelines with regard to food safety in Switzerland, consumers and industry operators should refer to the Federal Office for Food Safety and Veterinary Affairs, the FOSV, and local cantonal authorities.
Source:Nationwide campaign in Switzerland on the occurrence of PFAS in animal-based foods
