Case guide

Paraquat Spray Drift: Records and Claim Questions

Lived or worked near possible paraquat spraying? Keep the places, dates and product details you know.

See If You Qualify

Free · No obligation · About 2 minutes

Updated Oct 4, 202614 sources

This may apply to you if

  • These suggestions help you prepare for a claim check. They are not a firm's acceptance rules.
  • Describe what you know about paraquat use, work and locations.
  • Bring Parkinson diagnosis and care records if available.

What the public record says

These are cited sources. Their inclusion does not imply that they endorse People’s Justice or reviewed this page.

Srishti Shrestha · Epidemiology Branch, National Institute of Environmental Health Sciences · First author, Agricultural Health Study Parkinson cohort

Finding: The prospective cohort did not find a statistically significant overall association for reported paraquat use. Exposure and disease measurement limits prevent treating that as proof of no possible effect.

Shrestha: pesticides and incident Parkinson disease, original cohort (opens in a new tab) · Sep 10, 2020 · Checked Oct 3, 2026

The evidence and its limits

National Institute of Environmental Health Sciences, first-author affiliation · Environmental Research · 2020

Pesticide use and incident Parkinson disease in the Agricultural Health Study

Design:
Cohort
Participants:
66,110 people:38,274 applicators and27,836 spouses;491 reported incident doctor-diagnosed Parkinson cases.
Finding:
The overall paraquat-ever-use estimate was HR 1.09, 95% CI 0.84–1.41, not statistically significant.
Main limitation
Prospective observational cohort; exposure and disease largely reported through questionnaires with partial validation. Measurement error and subgroup uncertainty mean the result is not proof of no effect or an individual cause finding.

Read the source: Pesticide use and incident Parkinson disease in the Agricultural Health Study (opens in a new tab) · Checked Oct 3, 2026

University of California, Los Angeles, first-author affiliation · International Journal of Epidemiology · 2024

Agricultural paraquat dichloride applications and Parkinson disease

Design:
Case-control
Participants:
829 Parkinson patients and824 community controls in three California counties.
Finding:
Several modeled historical agricultural exposure measures and time windows were associated with Parkinson disease; co-exposure adjustments affected estimates.
Main limitation
Address/application models are not measured personal doses; observational case-control design cannot establish individual causation. The 500-meter exposure window is not an eligibility radius. Coauthors Myles Cockburn and Beate Ritz disclose plaintiff-expert consulting against Syngenta.

Read the source: Agricultural paraquat dichloride applications and Parkinson disease (opens in a new tab) · Checked Oct 3, 2026

The short answer

What should I record about a possible drift event?
Keep the location, date and what you directly saw. Distinguish observation from a product record. Do not guess the chemical from an aircraft or field. [6]
How is a study’s proximity measure different from dose?
It uses addresses and past spray records to estimate nearby use. It does not measure what entered your body. A study window is not a claim boundary. [5]
Does living nearby prove Parkinson’s was caused by drift?
No cause is decided from an address alone. Studies need their design and limits. A doctor and lawyer should assess your own records separately. [5]
What if I suspect a recent exposure?
Get medical care at once. Tell the care team what happened and what chemical is known. A legal review should not delay care. [14]

What rules a case out

Not covered by this case

  • No distance proves paraquat dose or automatically qualifies a claim.
  • A crop or aircraft alone does not identify the chemical used.
  • No national drift incident count or personal cause is supplied.

The process

What happens next

  1. 01

    You answer a few questions

    About two minutes. Nothing is sent until you agree on the last step and press submit.

  2. 02

    A lawyer looks at it

    A lawyer at the firm reads your answers and checks them against the current case criteria.

  3. 03

    The firm decides and gets in touch

    If the firm takes your case, you get the terms in writing to read before you sign. You can always say no.

Lived or worked near possible paraquat spraying? Keep the places, dates and product details you know. A map is not your measured dose. Get care at once for suspected recent exposure.

What should I record about a possible drift event?

Keep the location, date and what you directly saw. Distinguish observation from a product record. Do not guess the chemical from an aircraft or field.

EPA recognizes possible bystander risks from off-target spray and requires controls on labeled aerial use. Its overview is not a measurement of what reached one home. Save an available application notice or report with its source and ask which record identifies the actual product.

How is a study’s proximity measure different from dose?

It uses addresses and past spray records to estimate nearby use. It does not measure what entered your body. A study window is not a claim boundary.

The California study modeled historical paraquat applications within a 500-meter area around home and work addresses. Results varied by measure and time window. The model does not establish which air route, amount or event caused one person’s disease. Keep that limit when comparing an address with agricultural records.

Does living nearby prove Parkinson’s was caused by drift?

No cause is decided from an address alone. Studies need their design and limits. A doctor and lawyer should assess your own records separately.

The positive California study and the farm cohort’s null overall result use different designs. Exposure measurement and other pesticide exposures affect interpretation. Some California-study authors disclosed plaintiff-expert consulting. Neither finding turns proximity into a guarantee that a firm accepts a claim or that one illness has a paraquat cause.

What if I suspect a recent exposure?

Get medical care at once. Tell the care team what happened and what chemical is known. A legal review should not delay care.

CDC describes serious acute poisoning risks from swallowing, skin contact or breathing exposure. Signs alone do not prove dose or the substance. Follow professional instructions for the actual situation instead of handling contaminated materials or choosing a home treatment to preserve a claim.

Which records help connect the places and health history?

Keep home and job dates, actual spray notices and care reports. Mark gaps as gaps. Ask how to obtain missing covered health records.

Application documents and an exposure model answer different questions. Retain original records without inserting a product name where it was never recorded. The access rule has exceptions and does not promise every person all public, employer or clinical files. Ask why each requested record matters.

What time and cost questions should I ask?

Have a lawyer check the applicable filing rule. Read written fees and expenses. Confirm who receives the history and what action comes next.

There is no national drift-claim cutoff supplied here. The law and claim affect the personal period, and a records request does not establish a pause. Ask about legal expenses after a loss and confirm representation rather than treating a nearby field or a web inquiry as an accepted case.

Scientific evidence for this case

Paraquat claim: what to ask and what to do · Movement Disorders · 2023Cross-sectional

Paraquat and Parkinson’s Disease: The Role of Corporate Agnotology

Syngenta’s corporate predecessor ICI identified paraquat neurotoxicity in 1958 and confirmed brain penetration in 1966

Paraquat claim: what to ask and what to do · Neurology · 2013Meta-analysis

Exposure to Pesticides or Solvents and Risk of Parkinson Disease (Meta-Analysis)

Paraquat exposure was associated with an overall odds ratio of 1.64 for Parkinson’s disease, confirming a statistically significant increased risk

Paraquat claim: what to ask and what to do · Environmental Health Perspectives · 2011Cohort

Rotenone, Paraquat, and Parkinson’s Disease (FAME Study)

People who reported using paraquat had about 2.5 times the odds of Parkinson’s disease (odds ratio 2.5; 95% CI 1.4–4.7)

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Questions about this guide

How far can paraquat spray drift travel from the application site?

Paraquat spray drift can travel hundreds of meters to several kilometers from the target area, depending on application method, wind conditions, droplet size, and atmospheric conditions. Aerial applications produce the widest drift patterns because spray is released from height and is carried by wind currents. Ground rig applications produce narrower drift but can still carry paraquat well beyond field boundaries. Studies have detected paraquat residues in air, soil, and water samples at significant distances from application sites. For litigation purposes, atmospheric dispersion modeling can reconstruct historical drift patterns based on known application records and weather data to estimate your exposure level.

I lived near farmland but don’t know if paraquat was used — how can I find out?

Several sources can help determine whether paraquat was used near your home. USGS pesticide use estimates provide county-level data on paraquat application for every county in the United States. State departments of agriculture maintain records of restricted-use pesticide purchases and applications. County agricultural commissioners (particularly in California) maintain detailed application records. The USDA Census of Agriculture provides crop data that can indicate likely pesticide use patterns. Your attorney can subpoena application records from specific farms and aerial application companies. Even without specific records, the type of crops grown near your home (cotton, soybeans, corn, orchards) can indicate likely paraquat use, as the herbicide was widely used on these crops.

Are drift exposure claims as strong as direct applicator claims?

Drift exposure claims may involve lower estimated exposure levels than direct applicator claims, but they are recognized and viable in the paraquat litigation. The strength of a drift claim depends on several factors: the duration and frequency of exposure (living near treated fields for decades produces significant cumulative exposure), the proximity of your home to application sites, the availability of evidence documenting paraquat use in your area, and the severity of your Parkinson’s disease. The scientific evidence supports the conclusion that chronic low-level exposure over years can cause the same neurotoxic damage as shorter periods of higher exposure. An attorney can evaluate the specific circumstances of your drift exposure and advise on the viability and potential value of your claim.

Sources

  1. ABA Model Rule 1.5: feesABA Model Rule 1.5: fees
  2. Southern District of New York: time limitsSouthern District of New York: time limits · court
  3. 45 CFR 164.524: access to health records45 CFR 164.524: access to health records · regulator
  4. Shrestha: pesticides and incident Parkinson disease, original cohortShrestha: pesticides and incident Parkinson disease, original cohort · study
  5. Paul: agricultural paraquat applications and Parkinson disease, original case-control studyPaul: agricultural paraquat applications and Parkinson disease, original case-control study · study
  6. EPA: Paraquat Dichloride review and acute safetyEPA: Paraquat Dichloride review and acute safety · regulator
  7. Rosenstengel: Paraquat Doc5834 limited discoveryRosenstengel: Paraquat Doc5834 limited discovery · court
  8. Rosenstengel: Paraquat Doc5839 specified dismissalsRosenstengel: Paraquat Doc5839 specified dismissals · court
  9. Southern District of Illinois: September11,2026 Paraquat textorderSouthern District of Illinois: September11,2026 Paraquat textorder · court
  10. EPA Enforcement Action Against AMVAC Includes $541,110 Penaltyecho.epa.gov · Jul 31, 2026 · regulator
  11. Syngenta settled the Bill Mertens Philadelphia bellwether on the eve of what would have been the first public paraquat/Parkinson's trial; amount undisclosed. Per the report, Syngenta has settled every trial-ready case before opening statements; a prior multi-plaintiff settlement exceeded $187M; next trial was set for April 2026. Verified via The New Lede.thenewlede.org · Jan 27, 2026
  12. An April 8, 2026 court order says co-lead plaintiffs’ counsel and defendants signed a master settlement agreement for certain paraquat claims on September 3, 2025. The order calls for information about people who declined offers or had not chosen whether to participate. It states no payment amount for any person.thenewlede.org · Apr 14, 2025
  13. Judge Rosenstengel issued the MDL-3004 Daubert orders 'Order Relating to Dr. Wells' and 'Order Relating to Dismissal of Cases' (both dated 2024-04-17 on the S.D. Ill. court's MDL page), excluding plaintiffs' sole causation expert Dr. Martin Wells as unreliable and granting judgment against the first four bellwether cases; the court then ordered selection of a new bellwether pool. Order dates verified on the court's own site; details corroborated by AboutLawsuits (secondary tracker, flagged).ilsd.uscourts.gov · Apr 17, 2024 · court
  14. CDC: Paraquat Chemical Emergency Fact Sheet

Checked against 12 primary sources by People's Justice editors · Updated

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