In June 2026, a former pest control worker from New York filed suit in Philadelphia against Dow, Corteva, and FMC, alleging that years of mixing and applying chlorpyrifos caused his Parkinson’s disease. The defendants removed the case to federal court in July. It is one lawsuit — but it is a model complaint, a defendant list, and a theory that thousands of applicators may recognize.
The paraquat precedent
Paraquat, a herbicide, has been linked to Parkinson’s in epidemiological and laboratory studies for two decades. Lawsuits by applicators and farmworkers were consolidated in a federal MDL in 2021, grew to thousands of cases, and moved toward settlement in 2025. That litigation established the practical framework: occupational exposure history, a neurologist-confirmed diagnosis, and expert testimony on mechanism.
Why chlorpyrifos is next
Mechanism. Organophosphates disrupt the same cellular processes — oxidative stress, mitochondrial function — implicated in dopamine neuron loss. Laboratory studies have shown chlorpyrifos damages those neurons.
Epidemiology. Studies of agricultural workers have associated organophosphate exposure, including chlorpyrifos specifically, with elevated Parkinson's risk, with stronger associations at higher exposure.
Knowledge. The 1995 EPA fine was for failing to report chronic neurological effects. Plaintiffs argue the manufacturer knew the brain was a target organ for thirty years.
One case is not a mass tort. But every mass tort started with one case, and this one names the same defendants, pleads the same theories, and follows a template that produced thousands of paraquat claims.
Direct2Attorney · Litigation OutlookWho the theory applies to
Likely to fit
Based on the filed case- Licensed or commercial pesticide applicators
- Farmworkers who mixed, loaded, or sprayed
- Groundskeepers and pest control technicians
- Years of handling, not incidental contact
Less clear
Being evaluated- Residential drift exposure without handling
- Short-term or seasonal exposure
- Diagnoses other than Parkinson's or parkinsonism
- Exposure only to residential Dursban before 2000
What to gather
Employment history with dates and employers. Applicator license records, if any. Product names you recall using — Lorsban, Dursban, Cobalt, Nufos, Warhawk. Neurologist records confirming the diagnosis and its onset. Co-workers who can corroborate. Firms handling paraquat claims already have the infrastructure for this kind of case, and many are now screening chlorpyrifos exposures alongside them.
What this means if you're considering a claim
Early filers in a new litigation shape the bellwether pool and settlement tiers. If you handled chlorpyrifos products occupationally and have Parkinson’s or parkinsonism, a free review can determine whether a participating firm is accepting cases on this theory and whether yours fits.
Handled pesticides and diagnosed with Parkinson's?
Free, confidential review by a participating firm.
Common Questions
Potentially both, against different defendants. A firm can evaluate each exposure.
Some screening criteria include qualifying parkinsonism. A firm can review your neurology records.
Not yet. One case is pending in federal court in Pennsylvania. Consolidation would follow if filings grow.
Parkinson’s develops over decades. Exposure in the 1980s through 2010s is typical in the paraquat cases and likely here.
No. Direct2Attorney’s review is free, and participating law firms typically work on contingency, meaning fees are generally paid only if there is a recovery. Confirm fee terms in writing with the firm.
