CLASSIFICATION: EXPOSED (Court Records, Regulatory Filings) SUBJECTS: DuPont, 3M, Chemours, Corteva, EPA --- The Chemical That Never Dies Per- and polyfluoroalkyl substances (PFAS) are a class of over 14,000 synthetic chemicals that share one defining characteristic: they do not break down in the environment. Not in soil, not in water, not in the human body. They persist for geological timescales. The most studied PFAS compounds — PFOA (perfluorooctanoic acid, also known as C8) and PFOS (perfluorooctane sulfonic acid) — have been detected in the blood of virtually every human being tested, in rainwater at the poles, in the deep ocean, and in the placentas of unborn children. This was not an accident. It was the predictable outcome of a 50-year cover-up. DuPont Knew (1960s–1980s) DuPont began using PFOA in the manufacture of Teflon at its Washington Works plant in Parkersburg, West Virginia, in 1951. The chemical was supplied by 3M, which had invented PFOS in 1949 and PFOA-related compounds in the 1950s. Internal DuPont documents — later obtained through litigation — show that the company knew PFOA was toxic decades before the public or regulators were informed: 1961: DuPont's own Toxicology Section found that PFOA caused liver enlargement in rats and recommended "extreme care" in handling 1978: DuPont received data from 3M showing that PFOA was present in the blood of 3M factory workers 1981: DuPont discovered that PFOA caused birth defects in rats. The company removed female workers of childbearing age from Teflon production — but told them it was a "reassignment," not a health precaution 1984: DuPont's own testing confirmed that PFOA had contaminated the drinking water of communities surrounding the Washington Works plant. The company did not notify residents 1989: Internal memos show DuPont executives discussing PFOA's "toxicological liabilities" and strategies to limit the company's legal exposure At no point during this period did DuPont report these findings to the EPA, despite legal requirements to do so under the Toxic Substances Control Act. 3M Knew Too 3M was DuPont's primary supplier of PFOA and had been manufacturing PFOS since the 1950s for use in Scotchgard and firefighting foam. 3M's own internal research documented the dangers: 1975: 3M studies found PFOS in the blood of the general population — people who had never worked with the chemical 1979: 3M researchers found that PFOS caused "adverse effects" in test animals at low doses 1998: 3M informed EPA that PFOS was persistent, bioaccumulative, and toxic In 2000, under EPA pressure, 3M announced it would voluntarily phase out PFOS production. The company framed this as corporate responsibility. Internal documents later revealed that 3M had been planning the phase-out for months, partly to preempt regulatory action that could have been far more damaging. 3M continued producing other PFAS compounds. The Lawyer: Rob Bilott In 1998, a West Virginia cattle farmer named Wilbur Tennant walked into the Cincinnati law office of Rob Bilott, an environmental attorney who specialized in defending chemical companies. Tennant's cattle were dying. His pastures, adjacent to a DuPont landfill, were contaminated. His cattle had developed black teeth, tumors, and reproductive problems. He had been ignored by every agency he contacted. Bilott took the case. What began as a property dispute became a 20-year legal crusade that exposed one of the largest corporate cover-ups in American history. Through discovery, Bilott obtained tens of thousands of DuPont internal documents — memos, studies, emails, and reports — showing that DuPont had known about PFOA's toxicity for decades and had systematically concealed it from regulators, employees, and the public. Bilott's 24-page letter to the EPA in 2001, detailing DuPont's concealment, triggered a federal investigation. The EPA later fined DuPont $16.5 million — the largest administrative fine in EPA history at the time, and a fraction of the billions DuPont had earned from Teflon. The C8 Science Panel As part of a 2004 class-action settlement, an independent C8 Science Panel was established to study the health effects of PFOA exposure on approximately 70,000 residents of the Mid-Ohio Valley. The panel's findings, published between 2011 and 2012, confirmed probable links between PFOA exposure and: Kidney cancer Testicular cancer Thyroid disease High cholesterol Ulcerative colitis Pregnancy-induced hypertension Immunosuppression in children The word "probable" was a legal term of art reflecting the standard of evidence. The science was clear. The Settlements The financial reckoning has been enormous — though still dwarfed by the profits earned during decades of concealment: Settlement / Amount / Year DuPont C8 class action (initial) / $343 million / 2004 DuPont/Chemours settlements (multidistrict litigation) / ~$1.2 billion / 2017 3M PFAS water contamination settlement / $12.5 billion / 2023 DuPont/Chemours/Corteva latest settlement / $1.185 billion / 2023 Total estimated PFAS litigation costs (all companies) / $20 billion+ / Ongoing In 2015, DuPont spun off its fluorochemicals business into a new company called Chemours, which assumed significant liability for PFAS claims. Critics described this as an effort to limit DuPont's exposure to the consequences of its own actions. No DuPont or 3M executive has faced criminal charges. The Current Situation As of 2026: PFAS has been detected in the drinking water of over 1,500 communities across the United States The EPA finalized the first-ever federal drinking water standards for PFAS in 2024, setting limits of 4 parts per trillion — a threshold so low it reflects the scientific consensus that there is essentially no safe level of exposure The Department of Defense has identified hundreds of military bases contaminated by PFAS from firefighting foam An estimated 176 million Americans have PFAS in their drinking water at levels exceeding new federal standards PFAS remediation costs in the United States alone are estimated to exceed $400 billion The chemicals are still being produced. Industry has replaced PFOA and PFOS with "GenX" and other short-chain PFAS compounds, claiming they are safer. Independent research suggests they may not be. TDA Research Assessment What They Knew / When They Knew It / When the Public Found Out PFOA causes liver damage / 1961 / 2001 (Bilott EPA letter) PFOA in workers' blood / 1978 / 2001 Birth defects in animals / 1981 / 2004 (court documents) Community water contaminated / 1984 / 2001 PFOS in general population / 1975 / 2000 They didn't ask if you wanted indestructible toxic chemicals in your blood, your water, and your children. They put them there, knew what they had done, and said nothing — for 50 years. _- The Department_