The Belgian municipality of Zwijndrecht, located outside Antwerp in the Flemish region, has become the most extensively documented PFAS contamination cluster in Europe and one of the most significant globally. The source: 3M’s chemical manufacturing facility that produced PFAS—including PFOS-containing products—from the 1970s until 2002, followed by shorter-chain PFAS production until the facility’s complete PFAS production phase-out in 2024. The scale of contamination, the regulatory response, and the human health data collected from Zwijndrecht residents have shaped European PFAS policy and demonstrate the real-world consequences of decades of inadequate industrial PFAS oversight.
Contamination Discovery and Scale
The full scale of PFAS contamination in the Zwijndrecht area became publicly known in 2021 during excavation works for a new road bypass, when soil samples revealed abnormal PFAS concentrations traceable to 3M’s facility. Investigation revealed that PFAS had migrated from the plant into surrounding soil, groundwater, surface water, and agricultural land across a broad zone. The Flemish Environment Agency (OVAM) conducted extensive site characterization that mapped contamination across thousands of hectares of land on both sides of the Belgium-Netherlands border, with the contamination plume extending into Dutch agricultural areas and the Western Scheldt estuary.
Health Study: 8,568 Residents Tested
Flanders conducted one of the largest PFAS health studies ever undertaken in Europe, testing blood samples from 8,568 residents in the area surrounding the Zwijndrecht plant between 2023 and 2025. Results confirmed a clear correlation between residential proximity to the 3M facility and elevated blood PFOS concentrations. Residents living closest to the plant showed blood PFOS levels significantly above European reference values, and several hundred individuals had concentrations at levels associated in epidemiological studies with increased risk of thyroid disease, immune suppression, and elevated cholesterol. The results were presented to affected residents in a major public health consultation that generated intense media coverage and political pressure for accelerated remediation.
€571 Million Remediation Commitment
In response to regulatory orders from the Flemish government and intense political and legal pressure, 3M Belgium committed approximately €571 million to benefit the people of Flanders and carry out PFAS-related remedial actions. This commitment includes soil and groundwater remediation at and around the Zwijndrecht facility, environmental restoration measures in affected agricultural and ecological zones, health support programs for affected residents, and contributions to a Flemish PFAS environmental fund. The remediation program is one of the largest single-site PFAS cleanups in Europe and will involve sophisticated groundwater treatment systems operating for years to decades to capture and treat the existing contamination plume.
3M on Criminal Trial in Belgium: February 2026
In February 2026, 3M faced a Belgian criminal trial related to its handling of PFAS pollution from the Zwijndrecht facility—the first criminal prosecution of a PFAS manufacturer in European history. The trial, presided over by a Brussels court, examined whether 3M management had knowledge of the contamination risks associated with its PFAS production and whether the company took timely action to prevent and remediate the resulting environmental and health damage. The criminal proceedings run parallel to civil litigation brought by affected residents and the Flemish government seeking additional compensation beyond the €571 million remediation commitment. The trial is expected to set significant legal precedents for corporate liability in PFAS contamination cases across the EU.
Regulatory Impact on Flanders and Belgium
The Zwijndrecht crisis directly accelerated both Belgian and EU regulatory action on PFAS. The Flemish region implemented some of Europe’s strictest precautionary measures in response to the contamination: advisories against consuming locally grown vegetables, eggs, and animal products from affected areas; restrictions on the use of potentially contaminated groundwater for irrigation; and temporary dietary advice for residents with the highest blood PFOS concentrations. Belgium’s national government and the Wallonia and Brussels regions have also implemented PFAS monitoring programs and are developing product restrictions aligned with France’s and Denmark’s approaches. The contamination crisis generated significant political will for Belgium to actively support the EU REACH restriction proposal and to push for accelerated timelines in ECHA’s evaluation process.