By Attorney Fernando J. Lopez, Texas Personal Injury Lawyer | Updated June 22, 2025 View Attorney Bio
If you or someone you love worked around paraquat herbicide and later received a Parkinson’s disease diagnosis, you are not alone — and your question deserves a direct answer. Yes, scientific research links paraquat exposure to Parkinson’s disease, and thousands of farmworkers, agricultural workers, and bystanders across Texas have filed legal claims against the manufacturers. Lopez Law Group represents paraquat victims throughout the Rio Grande Valley, Houston, Dallas, and South Texas. This post covers what the science shows, who qualifies for a paraquat Parkinson’s lawsuit, and what steps to take right now.
Quick Answer: Does Paraquat Cause Parkinson’s Disease?
Yes. Multiple peer-reviewed studies and data from the National Institutes of Health link paraquat exposure to a significantly elevated risk of Parkinson’s disease. The herbicide, manufactured primarily by Syngenta, generates oxidative stress that destroys dopamine-producing brain cells. People exposed to paraquat — especially farmworkers in Texas — may qualify for a paraquat Parkinson’s lawsuit and financial compensation from the manufacturer.
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What Is Paraquat and Why Is It Still Used in Texas?
Paraquat is a fast-acting weed killer used on crops across the United States. Sold under brand names like Gramoxone, it kills vegetation on contact by disrupting cell membranes. It is one of the most widely used herbicides in American agriculture — and one of the most toxic.
The European Union banned paraquat in 2007 after courts found the manufacturer failed to prove the chemical was safe. The United States has not banned it. In Texas, paraquat is applied on cotton fields, grain operations, orchards, and along fence lines throughout the Rio Grande Valley, the Coastal Bend, and the High Plains. Workers along IH-2 and US-83 corridors near Mission, Edinburg, and Donna have faced regular paraquat exposure for decades.
Definition: Paraquat Dichloride
Paraquat dichloride is the active chemical compound in paraquat-based herbicides. It is classified as a restricted-use pesticide by the U.S. Environmental Protection Agency, meaning only certified applicators may legally purchase or use it. Despite that restriction, farmworkers, field laborers, and people living near treated fields regularly experience paraquat exposure through skin contact, inhalation, or accidental ingestion.
Only licensed commercial applicators may legally buy paraquat in the U.S. That has not prevented widespread exposure among farmworkers in Hidalgo County, Cameron County, and throughout agricultural South Texas.
The Science: How Paraquat Exposure Causes Parkinson’s Disease
The question of whether paraquat causes Parkinson’s disease has been studied for decades. The scientific consensus has shifted from suggestive to strong.
A landmark study published by the National Institutes of Health found that people exposed to paraquat were 2.5 times more likely to develop Parkinson’s disease than those with no exposure. The mechanism is direct. Paraquat molecules enter the bloodstream and cross the blood-brain barrier. Inside the brain, they generate reactive oxygen species — a form of chemical stress that destroys dopamine-producing neurons in the substantia nigra, the exact region damaged in Parkinson’s disease.
Dopamine is the neurotransmitter that controls movement. When paraquat kills enough dopamine neurons, the brain loses the ability to regulate motor function. The result is tremors, rigidity, slowed movement, and eventually the full progression of Parkinson’s disease.
According to the Unified Parkinson’s Advocacy Council and the Michael J. Fox Foundation for Parkinson’s Research, paraquat is among the most thoroughly studied environmental contributors to Parkinson’s disease. The NIH National Institute of Environmental Health Sciences has funded multiple epidemiological studies confirming the paraquat-Parkinson’s link across different exposure populations.
Paraquat herbicide lawsuit claims rest partly on this body of science. Syngenta, the primary manufacturer, has faced allegations that it knew about the neurological risks and continued marketing the product without adequate warning.
Paraquat Lawsuits: Syngenta and the Legal Landscape
The paraquat Syngenta lawsuit landscape has grown into one of the largest active mass tort litigations in the U.S. federal court system.
Thousands of plaintiffs have filed paraquat herbicide lawsuit claims in the Southern District of Illinois, where cases are consolidated in a multidistrict litigation (MDL). Plaintiffs allege that Syngenta and Chevron Phillips Chemical — the two primary U.S. distributors of paraquat — knew the herbicide caused Parkinson’s disease but failed to warn workers, applicators, or the public.
Key allegations in paraquat Parkinson’s lawsuits include:
- Failure to warn: Syngenta knew of research linking paraquat exposure and Parkinson’s disease but did not update product labels with adequate neurological risk warnings.
- Design defect: Plaintiffs argue a safer formulation or alternative herbicide was available, making the continued sale of paraquat’s current formulation unreasonably dangerous.
- Negligence: The manufacturers failed to conduct or disclose internal safety studies showing neurological harm in animal models.
- Fraudulent concealment: Internal Syngenta documents allegedly show the company actively worked to suppress or discredit independent paraquat exposure Parkinson’s research.
Paraquat settlement amounts from individual cases have not been publicly disclosed at scale, but legal analysts tracking the MDL note that serious Parkinson’s disease diagnoses with documented paraquat exposure history carry significant damages potential based on medical costs, lost earning capacity, and long-term care needs.
Paraquat vs. Roundup: Key Differences in Lawsuit Claims
Many people ask about the Roundup vs. paraquat lawsuit landscape because both involve weed killers and serious disease claims. They are distinct litigations with different legal theories.
| Factor | Paraquat Lawsuit | Roundup (Glyphosate) Lawsuit |
| Disease at issue | Parkinson’s disease | Non-Hodgkin’s lymphoma, cancer |
| Active ingredient | Paraquat dichloride | Glyphosate |
| Primary defendant | Syngenta, Chevron Phillips | Bayer (Monsanto) |
| Legal restriction | Restricted-use pesticide | General use herbicide |
| Settlement status | Active MDL, no global settlement announced | Bayer settled $10B+ in 2020 |
| Texas exposure risk | Farmworkers, agricultural laborers | Residential, commercial users |
| Litigation stage (2025) | Discovery, bellwether trials proceeding | Post-settlement individual claims |
Both are viable paraquat legal action Texas claims, but they are filed separately and involve different evidence. If you used or were exposed to both chemicals, you may have claims under both litigations. A paraquat attorney Texas and a Roundup lawsuit attorney can evaluate your exposure history for both.
How to File a Paraquat Parkinson’s Lawsuit in Texas
Filing a paraquat cancer lawsuit or Parkinson’s claim in Texas follows a specific process. Here is what your attorney will do with you, step by step:
- Schedule a free case evaluation. Your attorney reviews your work history, chemical exposure records, and Parkinson’s disease diagnosis to determine whether your timeline supports a valid claim.
- Document your paraquat exposure history. Gather employment records, pesticide application logs, crop records, and any documents showing where and when you worked near paraquat-treated fields. Witnesses who worked alongside you can also support your exposure history.
- Obtain your Parkinson’s disease medical records. Your diagnosis date, treating neurologist notes, and records of symptom progression are central to your claim. Your attorney’s team can help request these records directly from your providers.
- Identify the manufacturers. Your attorney confirms whether Syngenta, Chevron Phillips, or another distributor supplied the paraquat product used at your worksite.
- File within the Texas statute of limitations. Product liability claims in Texas generally must be filed within two years of the date you discovered — or reasonably should have discovered — that paraquat exposure caused your Parkinson’s disease.
- Join the federal MDL or file in Texas state court. Your attorney determines whether federal MDL consolidation or a Texas state court claim better serves your case. Many Texas farmworker Parkinson’s attorney filings proceed in the federal system.
- Pursue settlement or trial. Most mass tort claims resolve through negotiated settlement. If the manufacturer refuses a fair offer, your attorney prepares for trial.
You pay nothing upfront. Lopez Law Group handles paraquat exposure attorney cases on a contingency fee basis — no fee unless we recover for you.
Common Mistakes That Can Hurt Your Paraquat Claim
Avoid these errors. Each one can reduce your paraquat settlement amount or eliminate your claim entirely.
- Waiting past the Texas statute of limitations. Two years from discovery is a hard deadline. Missing it almost certainly bars your claim.
- Failing to document your exposure history. Without records showing where and when you worked near paraquat, connecting your diagnosis to the chemical becomes much harder.
- Assuming you need a cancer diagnosis. The paraquat cancer lawsuit framing sometimes confuses people. Parkinson’s disease — not cancer — is the primary injury in most paraquat claims. Do not disqualify yourself based on a misunderstanding of the litigation.
- Talking to Syngenta or its insurance representatives without an attorney. The manufacturer’s adjusters represent the company. Statements you make can be used to minimize your claim.
- Delaying because your Parkinson’s symptoms seem mild. Early-stage Parkinson’s is still Parkinson’s. Filing early protects your rights and preserves evidence.
- Throwing away work clothing, equipment, or employment records. Physical evidence and paper documentation of paraquat exposure are valuable.
- Assuming farmworker status disqualifies you. Farmworker Parkinson’s attorney claims are among the strongest in this litigation. Your work history is not a barrier — it is the foundation of your case.
Texas Legal Rights for Paraquat Exposure Victims
Texas Legal Notice
Texas law protects paraquat exposure victims through several important statutes and legal principles:
- Statute of Limitations: Under the Texas Civil Practice and Remedies Code, Chapter 16 (Limitations of Civil Actions), most product liability claims must be filed within two years from the date the injury was discovered or reasonably should have been discovered. The discovery rule may extend this deadline for victims whose Parkinson’s diagnosis came years after initial exposure.
- Modified Comparative Negligence (51% Bar Rule): Texas follows a modified comparative negligence rule under Texas Civil Practice and Remedies Code Section 33.001. If you are found 51% or more at fault for your injury, you may not recover damages. If you are 50% or less at fault, your damages are reduced proportionally. In most paraquat exposure claims, plaintiff fault is minimal or nonexistent.
- Product Liability Under Texas Law: Texas product liability law allows injured parties to sue manufacturers and distributors of defective products without proving negligence — only that the product was defective and caused your injury. Failure-to-warn claims are available even when the product itself was not structurally flawed.
- GEO Coverage: Lopez Law Group serves paraquat exposure victims in Hidalgo County, Cameron County, Harris County, Bexar County, Travis County, and throughout South Texas, including communities along US-83, US-281, IH-2, and IH-69.
This information is general and educational only. Every case is different. The outcome of your claim depends on the facts specific to your situation. No attorney-client relationship is formed by reading this page.
Paraquat Health Risks and Statistics
| Statistic | Year | Source | Why It Matters |
| People exposed to paraquat are 2.5x more likely to develop Parkinson’s disease | 2011 | National Institutes of Health, NIEHS | Establishes scientific basis for paraquat Parkinson’s lawsuit claims |
| An estimated 1 million Americans live with Parkinson’s disease; agricultural workers represent a disproportionate share | 2023 | Parkinson’s Foundation | Shows scale of potential plaintiff population, including Texas farmworkers |
| Texas employs approximately 400,000 seasonal and migrant farmworkers annually, many in paraquat-treated fields | 2023 | Texas Workforce Commission | Documents large Texas paraquat exposure population in the Rio Grande Valley and beyond |
| The global paraquat market was valued at $700 million in 2022, with the U.S. as a leading user | 2022 | Grand View Research / EPA pesticide usage data | Demonstrates continued widespread paraquat herbicide use despite known paraquat health risks Texas |
| Over 100 countries have banned paraquat, including all EU nations since 2007 | 2024 | Food and Agriculture Organization of the United Nations | Highlights regulatory disparity and supports failure-to-warn claims against Syngenta |
Attorney Lopez’s Perspective
“In our experience handling toxic exposure and product liability cases across Texas, we see paraquat exposure claims from farmworkers along the Rio Grande Valley who spent years working in fields without any warning about the neurological risks they faced. These workers trusted that the products used around them were safe. Syngenta had evidence suggesting otherwise. Our team fights to hold manufacturers accountable and recover the compensation our clients have earned.” — Attorney Fernando J. Lopez, The Lopez Law Group
When to Call a Paraquat Attorney in Texas
You do not need to wait for your Parkinson’s symptoms to worsen before contacting a paraquat exposure attorney. Call us if any of the following applies to you:
- You worked as a farmworker, agricultural laborer, pesticide applicator, or field supervisor in Texas and were regularly exposed to paraquat or Gramoxone
- You have received a Parkinson’s disease diagnosis and have a history of herbicide exposure
- You lived near agricultural fields in Hidalgo County, Cameron County, or elsewhere in South Texas where paraquat was applied
- A family member developed Parkinson’s disease after years of farm work or pesticide exposure
- You worked on cotton, grain, or orchard operations anywhere along IH-2, US-83, or US-281 corridors in the Rio Grande Valley
- Your employer never provided protective equipment or warnings about herbicide exposure on the job
- You want to know whether your paraquat legal action Texas claim is still timely
Lopez Law Group offers free consultations with no obligation. We handle paraquat herbicide lawsuit cases on a no-win, no-fee basis, and we serve clients in English and Spanish.
Call us at (956) 968-7800 to speak with our team today.
Frequently Asked Questions
Does paraquat cause Parkinson’s disease?
Yes. Multiple peer-reviewed studies, including research funded by the National Institutes of Health, show that paraquat exposure significantly increases the risk of developing Parkinson’s disease. The chemical destroys dopamine-producing neurons in the brain through oxidative stress. This scientific link is the foundation of thousands of active paraquat Parkinson’s lawsuit claims nationwide.
Who qualifies for a paraquat Parkinson’s lawsuit?
You may qualify if you were directly exposed to paraquat — as a farmworker, pesticide applicator, or someone who lived near treated fields — and later received a Parkinson’s disease diagnosis. Most qualifying claimants have documented agricultural work histories in states where paraquat is heavily used, including Texas.
What is a paraquat settlement amount in Texas?
Paraquat settlement amounts vary based on the severity of your Parkinson’s diagnosis, your medical costs, lost income, and your documented exposure history. No attorney can guarantee a specific figure. Individual settlements in complex Parkinson’s cases can reach hundreds of thousands to over one million dollars depending on case facts. A paraquat attorney Texas can give you a realistic assessment after reviewing your records.
How is a paraquat lawsuit different from a Roundup lawsuit?
A paraquat Parkinson’s lawsuit targets Syngenta and involves Parkinson’s disease as the primary injury. A Roundup vs. paraquat lawsuit comparison shows key differences: Roundup litigation involves glyphosate and non-Hodgkin’s lymphoma, primarily against Bayer (Monsanto), which settled for over $10 billion. Paraquat litigation is ongoing with no global settlement announced as of 2025.
Is there a paraquat class action lawsuit I can join?
Paraquat claims are handled as individual cases within a federal MDL in the Southern District of Illinois, not a traditional class action. Each plaintiff recovers based on their specific exposure and injury facts, which typically allows for larger individual recoveries than a class action structure.
How long do I have to file a paraquat claim in Texas?
Under Texas law, you generally have two years from the date you discovered — or should have discovered — that paraquat exposure caused your Parkinson’s disease. Because Parkinson’s develops gradually and the connection to paraquat may not be immediately obvious, the discovery rule may extend your deadline. Contact a farmworker Parkinson’s attorney Texas immediately to protect your rights.
Can I file a paraquat claim if I was not a licensed pesticide applicator?
Yes. Many paraquat exposure claims come from workers who were never licensed applicators but who worked in proximity to fields where paraquat was sprayed. Exposure does not require direct handling of the chemical. Living or working near treated areas may be sufficient if exposure can be documented and tied to your diagnosis.
What does a paraquat attorney in Texas do for my case?
A paraquat exposure attorney gathers your work history, medical records, and exposure documentation, identifies the responsible manufacturers, and files your claim in the appropriate court — whether the federal MDL or Texas state court. Your attorney also negotiates with the manufacturer’s legal team and, if needed, takes your case to trial. You pay no fees unless compensation is recovered.
Is paraquat still legal in Texas?
Yes. Paraquat remains legal in the U.S. as a restricted-use pesticide. Only licensed commercial applicators may purchase and apply it. Despite more than 100 countries banning paraquat, the EPA has not prohibited its use in the United States, leaving agricultural workers in Texas and across the country at continued risk of paraquat exposure.
What paraquat health risks should Texas farmworkers know about?
Beyond Parkinson’s disease, paraquat health risks Texas farmworkers face include acute lung injury from inhalation, kidney damage, and liver toxicity from high-dose exposure. The chronic neurological risks — specifically the connection between repeated low-dose paraquat exposure and Parkinson’s disease onset — are the basis of most ongoing paraquat legal action Texas claims.
What is the paraquat MDL and how does it work?
The paraquat MDL (multidistrict litigation) is a federal court proceeding that consolidates thousands of individual paraquat Parkinson’s lawsuit claims before a single judge in the Southern District of Illinois. Consolidation speeds up discovery and pretrial proceedings. Each plaintiff’s case remains individual and is not merged into a class action. Bellwether trials test key legal and factual theories before broader settlement discussions begin.
Can family members of paraquat victims file a claim?
In certain circumstances, yes. If a family member died as a result of Parkinson’s disease complications linked to paraquat exposure, surviving family members may file a wrongful death claim under Texas law. Spouses and children who suffered loss of companionship and financial support may also be entitled to damages. A wrongful death attorney can review the specific facts of your family’s situation.
Get Your Free Case Review
The science is clear: paraquat exposure causes Parkinson’s disease. If you worked around paraquat as a farmworker, agricultural laborer, or pesticide applicator in Texas — whether in the Rio Grande Valley, near Corpus Christi, in Houston, or anywhere else in the state — and you have a Parkinson’s diagnosis, you may have a right to financial recovery.
Lopez Law Group has recovered more than $25 million for injured Texans. Attorney Fernando J. Lopez and our team handle paraquat herbicide lawsuit cases on a no-win, no-fee basis, with free consultations in English and Spanish.Contact our paraquat attorneys in Texas todayand let us evaluate your case at no cost.Call us at (956) 968-7800 — Monday through Friday, 8:30 AM to 5:30 PM.The Lopez Law Group — Weslaco | Houston | Austin | Overland Parkfollow us on Facebook, Instagram, and X for the latest updates!
About Attorney Fernando J. Lopez
Fernando J. Lopez is a Texas personal injury attorney and founder of Lopez Law Group, with more than 15 years of experience representing accident victims, injured workers, and product liability plaintiffs throughout Texas. The firm has recovered over $25 million for clients across South Texas, Houston, and Dallas. Attorney Lopez serves clients in both English and Spanish from offices in Weslaco, Houston, and Austin. View full attorney bio.
