Each contaminant class carries its own analytical difficulties, its own state of scientific development, and its own reasons that matters succeed or fail.
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Toxic tort matters cluster around a relatively small number of substance classes, and each behaves differently as litigation. Some have decades of epidemiology and a settled general causation position, so the fight moves entirely to individual exposure and specific causation. Others are early enough in their scientific development that general causation is itself the battleground. Some are regulated by long-stable standards; PFAS, by contrast, is the subject of a live and contested federal rulemaking whose outcome will shape both compliance obligations and the evidentiary landscape. This department covers what distinguishes the major classes — analytically, scientifically, and in how they are litigated.
Three classes with genuinely different profiles. The differences matter more than the similarities.
The largest active contamination wave — persistence, thousands of compounds, and a federal standard still being rewritten.
investigateChlorinated solvents, benzene and ethylene oxide — mature science, vapor pathways, and air-modeled emission claims.
investigateAsbestos, lead, silica and heavy metals — long latency, product identification, and exposure decades in the past.
investigateHow the Institute approaches a contaminant question — orientation on the state of the science, not an opinion on it.
By case count the largest active mass torts include talc, with more than 67,000 pending cases, and AFFF firefighting foam under MDL-2873, which stood at roughly 15,200 cases with PFAS personal injury filings growing sharply through 2025. Camp Lejeune water contamination, Roundup, paraquat and chemical hair relaxer litigation also carry substantial dockets. Ethylene oxide is the notable maturing wave — sterilization-facility emissions cases have produced a $363 million verdict against Sterigenics, a $408 million settlement resolving roughly 900 Willowbrook claims, and a $20 million Georgia verdict against C.R. Bard in 2025, with litigation now active in several states.
Because its physical and regulatory situations are both unusual. PFAS compounds are exceptionally persistent — they do not meaningfully degrade, so plumes extend further and last longer than solvent plumes and conventional attenuation assumptions do not apply. There are thousands of individual compounds, most without toxicological characterisation, and analytical methods are still developing. On top of that the federal drinking water standards are mid-rulemaking and contested, so the regulatory backdrop that would normally provide a stable reference point is itself in motion.
It depends which showing is at issue. For substances with decades of literature and authoritative review, general causation may be effectively settled for certain disease pairings, and matters turn on individual exposure and specific causation. For emerging contaminants, general causation is often the whole fight, and early matters function as tests of whether the evidence base can carry the inference at all. Assessing honestly where a substance sits on that spectrum is one of the more valuable things to do before committing to a matter, in either direction.
Consistently, for two reasons. Long latency means diagnoses continue to appear decades after exposure ended — asbestos remains active for exactly this reason. And CERCLA's federally required commencement date can preserve claims that state accrual rules would otherwise have extinguished, by starting the limitations clock when the claimant knew or should have known the harm was caused by the substance. Legacy contamination is therefore rarely closed simply because the release was long ago.
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