Paraquat Parkinson's Lawsuit in California

What California residents should know

California residents are not necessarily limited to filing only in California state court. Many mass tort claims may be evaluated by national firms, filed in federal court, coordinated through MDL proceedings, or handled through another legal process.

State law may still matter for deadlines, damages, claim evaluation, and certain procedural issues.

What stands out about Paraquat litigation in California?

California is the only state to have enacted a paraquat-specific reevaluation mandate. AB 1963, signed into law on September 27, 2024, requires the California Department of Pesticide Regulation (CDPR) to complete a formal reevaluation of paraquat by January 1, 2029. The 2024 legislative push did not enact an outright ban, but the reevaluation framework is distinct to California.

California also carries a direct defendant connection: Chevron U.S.A. Inc. — one of the named paraquat defendants — is headquartered in San Ramon, California. Paraquat is used in California's almond, grape, and other specialty-crop sectors, and remains a federally restricted-use pesticide that may only be applied by certified applicators.

Federal paraquat cases filed by California residents in any of the four California federal districts are transferred by the JPML into MDL-3004 (S.D. Illinois, Chief Judge Nancy J. Rosenstengel) for coordinated pretrial proceedings. As of mid-2026, a review of California Department of Pesticide Regulation materials and California Attorney General announcements did not surface a state-level paraquat action against Syngenta or Chevron; this is an absence-of-evidence statement rather than a guarantee.

Sources: California AB 1963 (chaptered Sept. 27, 2024) — paraquat reevaluation mandate; CDPR 2022 Pesticide Use Report data summary; California Attorney General — press releases; JPML — pending MDL dockets.

Possible eligibility factors

California residents may want to speak with a lawyer if they used or were exposed to Paraquat herbicide products and later experienced Parkinson's disease.

• Use, prescription, employment, service, or exposure history.
• Medical diagnosis and treatment records.
• Approximate dates of use, exposure, diagnosis, and treatment.
• Information about prior conditions, alternative exposures, or other facts a lawyer may need to evaluate.

What records support Paraquat claims in California?

• Farm, applicator, co-op, employer, crop, purchase, spray-log, or pesticide-license records showing paraquat exposure.
• Records showing mixing, loading, spraying, equipment cleaning, drift exposure, or work near treated fields.
• Neurology records, movement-disorder specialist notes, medication history, and Parkinson's diagnosis records.
• Co-worker names, witness statements, photos, calendars, safety training, and documents tying exposure to a product and season.

What exposure and legal context matter in California?

State residents may have encountered paraquat through farms, crop handling, pesticide application, agricultural work, mixing, loading, or nearby work activities.

Where are California Paraquat cases handled?

Living in California does not necessarily mean the case will be filed only in California. Claims may be evaluated by national firms, filed in federal court, coordinated through MDL proceedings, or handled through another legal process.

Federal courts in California

• Northern District of California
• Eastern District of California
• Central District of California
• Southern District of California

What is the filing deadline for Paraquat lawsuits in California?

For a California resident researching Paraquat claims, the starting point is usually California's general personal injury period: 2 years under Cal. Code Civ. Proc. § 335.1. That is only a starting point, not a final legal deadline for every person.

The real filing deadline can depend on diagnosis date, when the injury and possible cause were discovered, exposure location, wrongful-death issues, prior claim paperwork, and whether the case is filed directly, transferred to an MDL, or handled through another process.

Discovery-rule note: California applies a discovery rule: the period generally runs from when a plaintiff discovers, or reasonably should have discovered, the injury and its wrongful cause.

How long do California residents have to file?

California's personal injury statute of limitations applicable to product liability claims is 2 years (Cal. Code Civ. Proc. § 335.1). Accrual timing, tolling, and repose periods can still change the real deadline in an individual case.

• Filing period: 2 years — Cal. Code Civ. Proc. § 335.1.
• Discovery rule: California applies a discovery rule: the period generally runs from when a plaintiff discovers, or reasonably should have discovered, the injury and its wrongful cause.

Because the controlling deadline depends on diagnosis date, discovery facts, exposure history, wrongful-death rules, and how the claim is filed, only a licensed attorney can confirm the deadline that applies to a specific situation. This page is general legal information, not legal advice.

What should California residents ask a lawyer?

• What proof do you need to connect my farm, applicator, or bystander exposure specifically to paraquat?
• How do Parkinson's diagnosis date, symptom history, and neurology records affect review?
• Does the confidential settlement program affect whether my claim can be evaluated?
• How do state filing deadlines affect my exposure and diagnosis timeline?
• Would my claim be handled locally, nationally, or through the MDL?
• Are there upfront costs?