Paraquat Lawsuit Popular Herbicide Linked to Parkinson's Disease

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Paraquat Lawsuit

Congressional Democrats Propose Sweeping Overhaul Of Pesticide Regulation

August 4, 2020 - Congressional Democrats proposed a bill that would transform regulation of pesticides by immediately banning several chemical classes, adopting European and Canadian standards, allowing local governments to make rules and empowering citizens to petition and sue for review.

The Protect America’s Children form Toxic Pesticides Act would mark the first comprehensive overhaul of U.S. pesticide rules since 1996, according to its sponsors who say it would force action on substances considered dangerous to health and the environment. The plan would require the U.S Environmental Protection Agency to immediately suspend all pesticides banned in the European Union or Canada.

Any person would be able to sue to force a quick review of a pesticide that has not been evaluated for 15 years. The bill would also limit the EPA’s use of emergency exemptions and set up a mandatory national reporting system for injuries and other harm resulting from pesticides, which would trigger additional scrutiny.

“This bill updates our laws so that they adhere to the science,” said Sen. Tom Udall, D-N.M. “The United States sprays a total of over a billion pounds of pesticides each year on the food we feed to our children, exposing them to dangerous chemicals linked to brain damage and diseases like Parkinson’s. The farmworkers who feed our country face dangerous chemical exposure without recourse to protect their health.”

Their proposal has support from organizations representing farmworkers and environmentalists as well as a Parkinson’s advocacy group and organic food producers.

The Pesticide industry group CropLife America, blasted the plan as an end run around the regulatory process Congress established in 1947.

“The law has been amended many times but continues to balance the risks and benefits of every pesticide on the market today,” CropLife CEO Chris Novak said in a statement. “Legislation seeking to ban individual chemistries undermines the work of the U.S. Environmental Protection Agency’s career scientists and tears at the fabric of a law that has served our nation well for more than 70 years.”

The 37-page bill heads to the Agriculture Committee in both chambers. It likely faces opposition in the Republican-led Senate, where Kansas GOP Sen. Pat Roberts chairs the panel.

Read More Updates

Paraquat dichloride (paraquat) is a chemical agent most commonly used as an herbicide. Although it was first produced more than 130 years ago, its application as an herbicide did not become popularized until the mid-20th century. Paraquat is now used as an herbicide agent on a range of more than 100 different types of crops.

According to the American Council on Science and Health, Paraquat’s relative toxicity of glyphosate, another popularly used herbicide known to be toxic, ranges from 33-250. A lethal dose for an average person is around 2.5 grams, and it is even more toxic when inhaled. Paraquat’s toxicity has made it a traditionally popular agent for suicide because it can kill a person with a single sip.


Paraquat Linked to Parkinson’s Disease

In February 2011, the National Institute of Health (NIH) conducted a study – the Farming and Movement Evaluation (FAME) – exploring claims that exposure to the popular herbicide Paraquat could be linked to a greater risk of developing Parkinson’s disease.

Following the study’s release, Syngenta, a Swiss herbicide manufacturer, claimed on its website that data from the study showed that farmers who use Paraquat are less likely to develop Parkinson’s disease than the general population. This claim was highly debated by the study’s authors, who attested that the data from the study showed that individuals were roughly two and a half times more likely to develop Parkinson’s after being exposed to Paraquat (or a similar herbicide – Rotenone).

FAME drew data from the Agricultural Health Study, a larger project that tracked more than 80,000 farmers, agricultural workers, and their spouses. FAME researchers identified 115 individuals who had developed Parkinson’s, studying 110 of these individuals who were open to providing information on the herbicide they frequently used.

Syngenta held the findings in contention, arguing that because only 115 individuals developed Parkinson’s out of more than 80,000 North Carolinians and Iowans included in the Agricultural Health Study, direct correlation between Paraquat and an increased risk of developing Parkinson’s could not be proven. “The incidence of Parkinson’s disease [in the study] appears to be lower than in the general U.S. population,” explained Syngenta, trying to rationalize their website’s claim.

Dr. Caroline M. Tanner, the director of the Parkinson’s Disease Research, Education and Clinical Centers at the San Francisco Veterans Affairs Medical Center and the lead author of the FAME study explained that Syngenta’s argument held no basis because FAME was not a comprehensive assessment of the incident Parkinson’s among all 80,000 individuals. Rather, the study chose a group of people who did have Parkinson’s – studying that specific group against a control group.

In actuality, FAME relied on self-reporting from participants of the larger Agricultural Health Study. “There were probably quite a few people with Parkinson’s disease who did not enroll in our study,” explained Dr. Freya Kamel, a scientist at the National Institute of Environmental Health Sciences, a branch of the National Institutes of Health and a co-author of the FAME study.

Syngenta said it “went to significant lengths to attempt to access the data” from the FAME study so that the manufacturer could “gain as complete an understanding as possible of the study in the pursuit of scientific rigor.” Kamel called Syngenta’s analysis inappropriate.

Kamel found the FAME study data linking {araquat to Parkinson’s “about as persuasive as these things can get.”

A similar study conducted in 2012 – the Genetic Modification of the Association of Paraquat and Parkinson’s Disease – found that individuals who used Paraquat, and who also had a specific genetic variation, were 11 times more likely to develop Parkinson’s, indicating that some people are put at greater risk by being exposed to the chemical.


Paraquat Banned Across the Globe

Around the world, Paraquat is banned in 32 countries. Notably, although Paraquat is produced by Swiss manufacturer Syngenta, use of the herbicide has been banned in Switzerland since 1989.

Paraquat has been on the banned substances list in England and throughout the European Union since 2013 yet one of Syngenta’s largest Paraquat manufacturing facilities is located in Northern England, but most of the yield is sent to the United States.

China also produces Paraquat. Although it is known for being an industrial nation with lax environmental regulations, China announced in 2012 that it would begin to phase out Paraquat to “safeguard people’s lives”. All production is now exported.

Many other nations are now following suit and venturing away from the herbicide, citing research that links the chemical to health risks.


Increased Paraquat Use in the United States

But in the U.S., in recent years, Paraquat has become a popular alternative to Monsanto’s Roundup. Roundup has long been the preferred herbicidal agent for American agricultural workers, but as weeds and pests are becoming more resistant to it and lawsuits alleging dangers and injuries arise, farmers are turning to alternative herbicides and pesticides to treat their crops.

Paraquat has become the preferred herbicidal alternative, in light of the issues surrounding Roundup, especially for soybean fields, where the number of pounds used is up fourfold over the last 10 years. In 2016 alone, the United States sprayed 7 million lbs. of Paraquat over nearly 15 million acres of land.

However, it is important to note that all Paraquat products are Restricted Use Pesticides (RUPs), meaning only licensed applicators are able to purchase and use the herbicide. All applicators must be “licensed in accordance with EPA regulations and state, territorial and tribal laws.”


EPA Regulatory Filing

In March 2016, the Environmental Protection Agency (EPA) announced in a regulatory filing that they would be further exploring the possible health risks associated with Paraquat. The filing is part of a program, sponsored by the EPA, that re-evaluates all pesticides on a 15-year cycle

In the announcement, the agency said, “There is a large body of epidemiology data on paraquat dichloride use and Parkinson’s disease.” The EPA plans to decide whether to place Paraquat on the banned substance or continue to allow the chemical to be sprayed on US cropland, but a final decision is not expected until next year at the earliest.

All documents related to the registration review can be located in docket number EPA-HQ-OPP-2011-0855 located at


New Research Backs FAME Findings

A December 2016 study published in Nature Chemical Biology reassures researchers who believe Paraquat to cause Parkinson’s. A CRISPR screen, an investigation into the possible agents that increase the risk of Parkinson’s for individuals exposed to Paraquat, identified a pathway required for Paraquat-induced cell death in humans. The study found that after being exposed to Paraquat, genes that may lead to Parkinson’s disease were identified using an innovate gene-editing technique. Further, the study found that {araquat kills cells through a mechanism called oxidative stress. The study was unable to reveal the exact process that allowed the herbicide to do so, though the researchers presented multiple theories.


Paraquat Lawsuit

There is currently a Paraquat lawsuit filed in St. Clair County, Illinois. The lawsuit, which was filed on Oct. 6, 2017, is filed on behalf of farmers and agricultural workers who were exposed to Paraquat and, as a result, developed Parkinson’s disease. The original defendants named in the {araquat lawsuit were Syngenta and Growmark.

Plaintiffs in the Paraquat lawsuit claim that Syngenta and Growmark manufactured Paraquat, distributed and sold it as Gramoxone or by other names since 1964.

In an amended complaint, plaintiffs also named Chevron Chemical as a defendant, claiming that Chevron acted in concert with Syngenta and Growmark.

Plaintiffs argue that, before the recent studies linking paraquat to Parkinson’s, they were completely unaware that the chemical posed any long-term health risks.


Can you Participate in the Paraquat Lawsuit?

If you have previously been exposed to Paraquat — or similar herbicide Rotenone — and subsequently developed Parkinson’s disease or signs of ongoing developing Parkinson’s, you may qualify to participate in the Paraquat lawsuit.

Contact the offices of TorHoerman Law today for a free, no-obligation Paraquat lawsuit case consultation. Our experienced chemical exposure law team can help you assess your case and your best plan of action.


Helpful Resources

You are not alone. There are resources and support groups available to guide you. Help, support, and advice are only a click away.

Causes of Parkinson’s

Environmental Risk Factors and Parkinson’s Disease

Environmental Exposures and Parkinson’s Disease

Environmental Factors

National Institute of Health 2013 Study

Parkinson’s Groups Call for Ban of Herbicide Linked to Parkinson’s Disease

Unified Parkinson’s Advocacy Council & Michael J. Fox Foundation Paraquat Letter

Find a Support Group

The Michael J. Fox Foundation

Litigation Updates

CASE UPDATE: Paraquat Lawsuit Filed

October 2017 - Paraquat lawsuit filed in St. Clair County, IL. The complaint is filed against Syngenta, Growmark, and Chevron Chemical.


Study Conducted Exhibiting Genes that Lead to Parkinson's Disease

December 2016 - CRISPR screen study is published in Nature Chemical Biology. Screen finds that after being exposed to Paraquat, genes that may lead to Parkinson's disease were identified using an innovate gene-editing technique.

Further, the study finds that Paraquat kills cells through a mechanism called oxidative stress. The study is unable to reveal the exact process that allows the herbicide to do so, though the researchers presented multiple theories.


EPA Announced Investigation of Paraquat Health Risks

March 2016 - The Environmental Protection Agency (EPA) announces in a regulatory filing that they would be further exploring the possible health risks associated with Paraquat.


Paraquat Use and Genetic Variation More Likely to Develop Parkinson's

October 2012 - The Genetic Modification of the Association of Paraquat and Parkinson's Disease finds that individuals who used Paraquat, and who also had a specific genetic variation, were 11 times more likely to develop Parkinson's, indicating that some people are put at greater risk by being exposed to the chemical.


Study Conducted Suggesting Link Between Paraquat and Parkinson's

February 2011 - The National Institute of Health (NIH) conducts the Farming and Movement Evaluation (FAME) study. Researchers find that individuals were roughly two and a half times more likely to develop Parkinson's after being exposed to Paraquat (or a similar herbicide - rotenone).


“Dems Propose Sweeping Overhaul Of Pesticide Regulation.” Law360,

Hakim, Danny. “This Pesticide Is Prohibited in Britain. Why Is It Still Being Exported?” The New York Times, The New York Times, 20 Dec. 2016,

“How to Get Certified as a Pesticide Applicator.” EPA, Environmental Protection Agency, 15 Nov. 2018,

Mercola, Dr. “Herbicide Used in Suicide Attempts Is Banned in 32 Countries, But the USA Isn't One of Them.”,, 3 Jan. 2017,

“Paraquat Dichloride.” EPA, Environmental Protection Agency, 29 May 2018,

Last Modified: August 5th, 2020 @ 01:22 pm

What is Paraquat?

Paraquat is a chemical agent most commonly used as a herbicide on a variety of crops throughout the United States. Studies have been conducted that link the herbicide to Parkinson's Disease. The first Paraquat lawsuit has been filed on behalf of farmers and agriculture workers who have been exposed to the herbicide and, as a result, developed Parkinson's disease. If you developed Parkinson's disease after applying herbicides or farming, please contact TorHoerman Law to see if you qualify for a lawsuit.