PFAS Findings in Basel-Landschaft Milk: Monitoring Results and Regulatory Context

Recent testing of raw milk from all 202 dairy farms in the Swiss canton of Basel-Landschaft revealed that 30 farms produced milk with levels of per- and polyfluoroalkyl substances (PFAS)—specifically perfluorooctanesulfonic acid (PFOS)—at or above the European Union’s indicative threshold of 0.020 micrograms per kilogram. According to the cantonal Office for Food Safety and Veterinary Affairs, the milk remains safe for consumption, as there are currently no specific legal maximum levels for PFAS in milk under Swiss food law.

Scope and Methodology of the PFAS Monitoring

Between January 31 and February 10 of this year, the Office for Food Safety and Veterinary Affairs, in collaboration with the Farmers’ Association of both Basel regions (Bauernverband beider Basel), conducted a comprehensive screening of all 202 dairy farms in the canton. Samples were collected directly from farm milk tanks or milk collection points. The analysis focused on identifying PFAS, a group of synthetic chemicals known as “forever chemicals” due to their persistence in the environment. The results showed that 172 farms, or 85 percent of the total, had either no detectable PFAS or levels below the EU’s 0.020 µg/kg threshold. In the 30 instances where the threshold was met or exceeded, the substance identified was exclusively PFOS, a compound that has been prohibited in Switzerland since 2011.

Regulatory Status and Consumer Safety

Despite the findings, consumers face no change in the availability or safety of dairy products. The cantonal authorities emphasize that the milk can continue to be sold, processed, and consumed without restriction. This is because Swiss food legislation does not currently mandate specific maximum limits for PFAS in milk, unlike existing regulations for drinking water, meat, eggs, or fish. While the European Union recommends that member states monitor milk and dairy products for these substances, current guidance suggests that an exceedance of the threshold should trigger a source analysis rather than a recall or ban on sale.

Next Steps for Affected Farms and Future Regulations

The Basel-Landschaft cantonal government anticipates that the European Union will likely establish formal maximum residue levels (MRLs) for PFAS in milk based on current monitoring data. It is expected that Switzerland will align its national food standards with these upcoming EU regulations to ensure that Swiss dairy products remain eligible for export. To prepare, the canton is offering affected farmers the option of a voluntary second round of testing to confirm the initial findings. If a farm’s results are confirmed, the government advises producers to work with cantonal authorities to identify the source of the contamination—which may stem from historical use of sewage sludge as fertilizer or the legacy of PFAS-containing firefighting foams.

Coordination of PFAS Mitigation Efforts

Recognizing the complexity of PFAS contamination, the Basel-Landschaft Government Council established an interdepartmental working group on June 23 to manage the issue. This body is tasked with coordinating cantonal activities and representing the region in national working groups. The goal is to provide a central point of contact for stakeholders, including the agricultural sector, as authorities look for ways to reduce PFAS levels in the food chain before stricter legal limits are introduced. Compared to other Swiss cantons, officials characterize the results in Basel-Landschaft as average and broadly consistent with data reported in the canton of Zurich.