3M produced PFOS, one of the many kinds of PFAS, between 1976 and 2002 [1]. According to company records, 3M has known their wastewater was contaminated with harmful PFAS since the 1980s [2]. In 2006, measurements of wastewater already showed high concentrations of PFAS [3]. These extraordinary measurements led to 3M’s environmental permit being sharpened in 2008, allowing a maximum PFAS concentration of 30 micrograms per liter. PFAS levels measured in 2011 by far exceed this threshold, but the Flemish Environmental Ministry (VMM) failed to communicate these data to the environmental inspection. It took them until 2016 to report the measurements. In 2019, the environmental inspection finally issued 3M a 7,200 euro fine for the PFAS pollution that had already been measured over a decade earlier [3]. Although 3M claims that PFAS do not pose a health hazard [4], the substances are linked to immune problems, reduced effectiveness of vaccinations, cancer, kidney failure, birth defects, and developmental issues, amongst others [2]. 

After decades of PFAS emissions by 3M, Zwijndrecht is the most PFAS-polluted area in Europe, with groundwater concentrations of up to 73,000 micrograms per liter [5]. Eggs from chickens near 3M have the highest concentrations of PFOS recorded in eggs worldwide [4]. The 3M factory has been discharging polluted water into the Schelde River, which transports PFAS to the Westerschelde (a protected natural area in the Netherlands) and into the North Sea. As such, the Netherlands is unable to comply with European environmental regulations. Fish in the Westerschelde have PFAS levels much higher than fish in the rest of the Netherlands [4]. Because the river has been contaminated, fishermen are advised to no longer fish in the Schelde, which deeply affects their livelihoods [2]. It is now clear that the severe PFAS pollution of the Westerschelde did not only come from 3M, but that waste processing company Indaver had been discharging PFAS in the Schelde as well [4].

After it became publicly known that 3M had been contaminating the environment with PFAS for years, inhabitants of the factory’s surroundings (within a 3 km radius) started getting their blood tested. From these tests, it appeared that over 90% of local residents had too much PFAS in their blood, and 59% of them risk getting severely ill [6]. Based on these concerning findings, the Flemish government introduced several no-regret measures to minimize further PFAS contamination. These measures include instructing residents not to eat fruit and vegetables from their gardens, not to eat eggs from their chickens, not to work with their bare hands in the soil, and to be careful with having their children play outside [7]

With the construction of the new Oosterweel Tunnel in Antwerp starting in 2022, large amounts of polluted soil were dug up, which brought the PFAS pollution to light [1]. Local residents already expressed concerns over the Oosterweel construction project and the dumping of polluted soil near residential areas before the project started [8]. Despite the soil being heavily contaminated with PFAS, state-owned company Lantis made a settlement with 3M to continue constructing the infrastructure project. Lantis and 3M agreed on 3M paying only 75,000 euros in sanitation costs, whereas Lantis would invest 63 million euros of tax revenues into sanitation [1]. 

On July 14, 2021, Greenpeace activists climbed the 3M building to demand the company take on the sanitation costs associated with the pollution they are responsible for [9]. Greenpeace also started a petition demanding that 3M pay all costs relating to their PFAS pollution and that the Flemish government guarantees prioritizing public and employee health [10].

In 2021, the Belgian Council of State decided to stop all of 3M’s production processes involving PFAS [11]. 3M filed an appeal against this decision, but this was rejected by the Council of State.

In 2022, a family living approximately one kilometer from 3M’s factory grounds sued the company and was granted provisional compensation of 2,000 euros [12]. According to the courthouse, the family suffered “excessive neighborly nuisance”, which is partly demonstrated by the fact that their blood contained PFAS levels up to 100 times over the accepted threshold. High concentrations of PFAS were also discovered in their vegetable garden.

In July of the same year, 3M made a sanitation agreement with the Flemish government, which stated the company would invest 571 million euros in sanitation and compensation of the affected area [7]. The sanitation work is planned to be executed between 2024 and 2028 [13].

In the summer of 2023, action collective Darkwater 3M filed a mass claim on behalf of hundreds of residents living within a 15 kilometer radius of the 3M factory [14]. The claim demands 20,000 euros of compensation per affected resident. Since then, 3M has announced its plans to discontinue the use of all PFAS from its operations by the end of 2025 [15].

- The first phase of the sanitation plan for the Zwijndrecht region involves the removal and replacement of 441,000 tons of polluted soil [13].

- The Oosterweel project requires 14 million cubic meters of polluted soil to be excavated [4].

This is a case related to "PFAS pollution by Chemours/Dupont, Dordrecht, The Netherlands" in the EJAtlas, and also to DuPont's contamination in Parkersburg, West Virginia, USA. The conflict in the USA led to the production of the film "Dark Waters" in 2019, and this name is used in 2023 by activists in Belgium.