Paraquat Lawsuit

People who have developed Parkinson’s disease after being exposed to paraquat are filing lawsuits against paraquat manufacturers and distributors. These include:

• Syngenta: Headquartered in Switzerland, Syngenta is the modern face of the original designers of paraquat, Imperial Chemical Industries. It is responsible for selling, promoting and marketing paraquat. It has an agreement with Chevron to help manufacture and sell paraquat in the United States. Various subsidiaries and Syngenta Group companies, including Syngenta Crop Protection LLC, may also be named in lawsuits.
• Chevron: Incorporated in Pennsylvania, Chevron is the successor to the California Chemical Company, Ortho Division. The California Chemical Company was the original business to partner with Syngenta to manufacture and distribute paraquat in the United States.
• FMC Corporation: Incorporated in Delaware and operating primarily out of Philadelphia, Pennsylvania, FMC is one of the largest distributors of paraquat in the United States.

These lawsuits seek compensation for the victims’ injuries.

Some of the paraquat lawsuits also include claims from victims’ spouses. These lawsuits claim Loss of Consortium. This is a legal term describing the losses a family or spouse may experience because of injuries to the victim.

Paraquat dichloride is a toxic chemical used as an herbicide. Paraquat was first sold in the U.S. in 1964 and has been used for decades to control weeds and invasive grasses. Farmers and farmworkers use it on many crops, including corn, soybeans, cotton, and vineyard grapes. It is the key ingredient in many spray herbicides, including Gramoxone, Firestorm, Helmquat and Parazone.

Other companies with paraquat products include:

• ADAMA Group
• Altitude Crop Innovations
• Drexel Chemical Company
• HELM Agro
• Innvictis®
• Sinon® USA
• UPL

Paraquat is classified by the U.S. Environmental Protection Agency (EPA) as a restricted use product. It is not available to the general public. According to the EPA, to use paraquat, “you must be a certified applicator and you must take the paraquat-specific training.”

Paraquat kills plants by disrupting necessary cellular functions. Once it gets through the plant's skin, paraquat causes a chemical reaction that hinders photosynthesis and damages other components of the plant’s cells. Paraquat is made more effective by adding surfactants, a type of chemical that lets paraquat stick to plants so it can be more easily absorbed.

Just as paraquat is effective on plant cells, it can have a similar effect on animal cells that absorb it. It disrupts cellular respiration in animal cells, like those found in humans. Plaintiffs allege as early as the 1950s, Syngenta was aware that paraquat could have a toxic effect on the human nervous system and that it could be absorbed through the skin.

Dozens of countries have banned paraquat, including the European Union (EU) and China. Kuwait first banned it in 1985. 

Despite many countries having acted already, paraquat is not yet banned in the U.S.

Here is a partial list of countries that banned, or have severely restricted the use of, paraquat, along with the year the country banned it. 

The U.S. has not yet banned paraquat. While the EPA has suggested some restrictions to the use of paraquat, it has yet to implement a full ban despite the evidence of harm.

In October 2020, the EPA proposed new safety measures to “reduce risks associated with paraquat in order to better protect human health and the environment.” An interim decision was released in July 2021. Measures outlined by the EPA include, but are not limited to: 

• Limiting aerial application acreage for all uses and use sites, except cotton desiccation.
• Prohibiting certain applicators, including pressurized handguns and backpack sprayers.
• Requiring enclosed cabs on sprayer vehicles if the area is treated in a 24-hour period and exceeds 80 acres. (Areas less than 80 acres should be treated from an enclosed cab or with users wearing PF10 respirators.)
• Requiring a residential area drift buffer.
• Prohibiting the use of human flaggers near and around application sites.

People most at risk for paraquat exposure include agricultural workers, their families and people who live near farms.

Paraquat exposure can lead to serious health effects, according to the Centers for Disease Control and Prevention (CDC). Many scientists have found the herbicide is linked to an increased risk of developing Parkinson’s disease. It can also be dangerous if ingested or inhaled or if it contacts the skin.

Paraquat’s high toxicity can cause life-threatening side effects. Paraquat induces oxidative stress, which can lead to a host of health problems. Oxidative stress changes the structure and function of important parts of cells, leading to serious cell damage.

Paraquat exposure can lead to many types of health effects. As with Parkinson’s disease, the effects of paraquat poisoning may have serious and potentially life-threatening impacts on people.

Symptoms related to paraquat poisoning include:

• Health effects: The development of Parkinson’s Disease and related neurological issues.
• Immediate signs of paraquat ingestion: Pain and swelling in mouth and throat, followed by gastrointestinal symptoms like nausea, vomiting, pain and diarrhea. 
• Health effects from ingesting small to medium amounts of paraquat: Development (within several days to several weeks) of heart failure, kidney failure, liver failure or lung scarring.
• Health effects from ingesting large amounts of paraquat: Development (within a few hours to few days) of severe health effects, possibly leading to seizures or even death, the EPA notes.

If you or a loved one are showing signs of sickness after being exposed to paraquat, seek immediate medical care.

Many studies have found strong associations between paraquat exposure over a long time and Parkinson’s disease. These consistent findings suggest that the use of paraquat causes an increased risk of Parkinson’s.

Parkinson’s disease is an irreversible neurological disorder. Symptoms typically become worse over time.

Common Parkinson’s disease symptoms include:

• Depression
• Difficulty with swallowing, chewing and speaking
• Emotional changes
• Impaired balance and coordination (may lead to falls and other injuries)
• Muscle stiffness and prolonged contraction
• Skin problems
• Slow movement
• Tremors (commonly in hands, arms, legs, jaw or head)
• Urinary problems or constipation

If you or a loved one experiences these symptoms, you should see your doctor immediately.

A paraquat lawyer can help explain your paraquat legal options. The options may include filing a personal injury lawsuit of your own. Product liability lawsuits seek to hold the manufacturers and distributors of paraquat accountable. Although there is never a guarantee, lawsuits may result in a settlement or verdict award.

Over the years, the scientific evidence showing strong links between paraquat exposure and Parkinson’s disease has been mounting.

• 1997: A study of Taiwanese individuals with and without Parkinson’s disease found a greater prevalence of Parkinson’s in people who had used paraquat than those without exposure. The study found no significant difference between the likelihood of developing Parkinson’s and occupational exposure to chemicals or heavy metals and minerals. 
• 2002: A study on mice found that exposure to paraquat was linked with selective dopaminergic degeneration in the subjects’ brains. This selective dopaminergic degeneration is a typical sign of Parkinson’s disease. 
• 2005: A study on mice found that repeated exposure to paraquat could start the process of destroying nigrostriatal dopaminergic neurons, a feature of Parkinson’s disease. The study saw mice begin to show signs of neuron loss following the second dosage of paraquat. 
• 2009: A study using California Pesticide Use Reports and land-use maps showed evidence that paraquat exposure increases the risk of contracting Parkinson’s disease. The risk is even greater for younger people. The risks increase if the person is exposed to both paraquat and a fungicide known as maneb.
• 2011: Using a sample of agricultural workers from the Agricultural Health Study, one study explored the effects of pesticides that increase oxidative stress and inhibit mitochondrial complex I. Researchers evaluated 110 people diagnosed with Parkinson’s disease and 358 control subjects. The study’s analysis found a statistically significant link between Parkinson’s disease and both types of pesticides. Paraquat impacts the human body in the same way as both types of pesticide groups 
• 2019: A systematic review of more than a dozen studies found a consistent, statistically significant pattern linking paraquat exposure and Parkinson’s disease.
• 2024: A study of three agricultural regions in California found that proximity to residential and commercial use of paraquat was associated with an increased likelihood of developing Parkinson’s disease

These studies, along with others, consistently point to the increased risk of developing Parkinson’s disease after paraquat exposure. Studies like this show why so many countries have banned the use of paraquat.

People who have developed Parkinson's disease after exposure to paraquat may be eligible to take legal action. Individuals who have filed lawsuits against the manufacturers and distributors of paraquat (Syngenta, Chevron, and FMC Corporation) include:

• A California man used paraquat on his citrus farms for decades, beginning in the late 1960s. He purchased, mixed, loaded and sprayed paraquat via hand sprayers and tractors each year to control vegetation and protect his crops. He was forced to retire once he began having neurological symptoms. He was diagnosed with Parkinson’s disease at the age of 73. He suffers from tremors, inability to care for himself, delusions/hallucinations, difficulty with moving and walking and loss of balance.
• A North Carolina man used paraquat from the late 1980s to the late 1990s while working for a utility company. During his work, he sprayed paraquat on powerlines, roads and rights of ways to clear vegetation. He was diagnosed with Parkinson’s disease at the age of 66. He suffers from tremors, drooling, constipation, fatigue, falls, hallucinations, cognitive decline and mobility issues. He is currently in a healthcare facility as he is unable to care for himself.
• A Pennsylvania man was exposed to paraquat while working on a farm in the 1970s and 1980s. The farm grew many crops including corn, wheat and oats. He was exposed to paraquat while it was mixed, loaded and sprayed on the farm. He was diagnosed with Parkinson’s disease at the age of 43 and has cognitive changes, decreased memory, dizziness, hunched posture, reduced facial expression, tremors, soft speech and urinary incontinence.

These are just a few of the people who have developed Parkinson’s after exposure to paraquat. They represent thousands of people who have had similar experiences.

Thousands of impacted people and their families have filed lawsuits against Syngenta, Chevron, FMC and other parties responsible for manufacturing and distributing paraquat. These lawsuits have been filed in both state and federal courts.

There are more than 1,000 plaintiffs in the Philadelphia County Court of Common Pleas cases. The federal MDL had 5,883 actions pending as of October 1, 2024.

Paraquat state litigation

As of March 2025, 1,136 paraquat lawsuits have been filed in the Philadelphia Court of Common Pleas. Judge Joshua Roberts is overseeing the lawsuits. The Court has issued an order setting the first group of bellwether trials for March 2025. 

Motley Rice attorney Fidelma Fitzpatrick is co-lead counsel and a member of the Plaintiffs’ Executive Committee (PEC) for the Pennsylvania mass tort. Mike Daly, of our Philadelphia office, is liaison counsel for the Pennsylvania mass tort. Several other Motley Rice attorneys also represent plaintiffs.

In January 2024, Judge Roberts denied defendants’ multiple preliminary objections arguments to the initial pleadings. Case-specific discovery has concluded and the first set of bellwether candidates are currently being selected for 2025 trials. Four cases will be selected to go to trial in 2025 with the first trial beginning in March 2025.

In addition, a group of cases have been filed in Delaware state court and motion practice is underway.

Paraquat federal multidistrict litigation (MDL)

There is one federal multidistrict litigation (MDL) docket related to paraquat. It is located in the Southern District of Illinois Court System. An MDL docket allows federal lawsuits with similar details and defendants to be decided by the same court. MDLs can help expedite the legal process. 

The paraquat MDL, called In Re: Paraquat Products Liability Litigation (MDL-3004), was established in 2021. Motley Rice is not involved in the federal MDL. Motley Rice paraquat lawyers have filed cases in Pennsylvania state court. 

Here are questions people often ask about the paraquat toxic exposure lawsuits.

Who qualifies for a paraquat lawsuit?

To qualify for a paraquat lawsuit, you must have been exposed to paraquat and suffered injuries that came from that exposure. If you believe you’ve been harmed by paraquat exposure, seek medical treatment. You can also consider speaking to a lawyer with experience in toxic exposure claims to evaluate your legal options.

To be eligible to file a lawsuit, you’ll need to show or testify that: 

• You were exposed to paraquat and not another herbicide.
• Your exposure occurred after paraquat became fully available on the market in 1966. 
• Your exposure is consistent with routine use of the herbicide. In agricultural and landscaping settings, paraquat was only applied a few times each year. Current guidance recommends applying the herbicide annually.

Keep in mind that if you’re experiencing health problems as a result of exposure to a toxic herbicide or weedkiller other than paraquat, you may be eligible to file a lawsuit against the manufacturer. Your toxic exposure attorney can review your case and help you understand your options.

How do you prove paraquat exposure?

Proving paraquat exposure will depend on how you may have been exposed. For example, agricultural workers and landscapers may have business receipts or employment records that can help show exposure. A paraquat attorney can help you gather evidence of paraquat exposure.

Is there a paraquat class action lawsuit?

No, there’s no paraquat class action lawsuit. However, large, consolidated litigations are ongoing in state and federal court. A state court docket in Philadelphia is proceeding well. More than 1,000 plaintiffs have filed suit against chemical companies in the Philadelphia County Court of Common Pleas for paraquat exposure. Motley Rice is working closely with this litigation and accepting new plaintiff filings.

A federal multidistrict litigation (MDL) docket had 5,883 plaintiffs as of early October. Motley Rice attorneys aren’t currently representing plaintiffs in the MDL. 

How much is the average settlement for a paraquat lawsuit?

Most paraquat Parkinson’s lawsuits are still in early stages and have not yet reached settlements. However, Syngenta’s financial records show some payouts have already happened. The company’s 2022 Financial Report shows a $187.5 million settlement to multiple claimants in 2021.

Syngenta is no stranger to large settlements and paid $1.5 billion to settle claims related to its pesticide Viptera in 2018 and 2019.

Motley Rice was not involved in this settlement or the Viptera settlements.

If you or a loved one was harmed by paraquat, you may also be eligible to file a lawsuit. A successful paraquat lawsuit can help compel Syngenta to pay for medical care costs to provide financial peace of mind. Speak with paraquat attorneys at our law firm to find out if you are eligible.

What types of damages are available in a paraquat lawsuit?

Plaintiffs in paraquat lawsuits are alleging both economic and non-economic damages for the injuries they’ve suffered. As part of their lawsuits, plaintiffs are requesting the following types of relief for the harm they’ve suffered: 

• Legal costs for pursuing the actions
• Loss of consortium
• Medical expenses and other related costs
• Mental and physical suffering
• Punitive damages

While the specific claims may vary, the types of damages seen across paraquat litigation include: 

• Breach of implied warranty of merchantability
• Negligence
• Public nuisance
• Punitive damages
• Strict liability (Design defect and failure to warn)
• Violation of consumer fraud and deceptive business practices acts

The damages available to individual plaintiffs depend on the facts of their case. It can be helpful to speak with an attorney who has experience handling toxic exposure claims to understand the legal options available to you.

Our attorneys have extensive experience litigating toxic exposure and environmental damage cases for individuals, families, communities, and states. Through our cases we seek justice for our clients and to improve environmental standards and protections. 

An example of our experience includes representing people who developed non-Hodgkin lymphoma after being exposed to Roundup weed killer. The firm also obtained a landmark settlement for 10 cities and counties in California that alleged three lead pigment companies created a public nuisance by exposing residents to toxic lead paint. 

Read more on our toxic exposure experience.