California’s Paraquat Phaseout: What Exposed Workers Should Know

For years, farmworkers across the San Joaquin Valley sprayed a weedkiller that most of the world had already banned. Now, that chemical — paraquat — is finally on its way out in California. But for the thousands of people who worked around it, the news raises a painful question: what happens to those who may already be paying the price with their health?

If you or a loved one worked with paraquat and later developed Parkinson’s disease or other serious health problems, you’re not imagining a connection. You’re also not alone. Call Walch Law now to get started on a Los Angeles Paraquat lawsuit at no cost to you.

What Paraquat Is and Why California Is Phasing It Out

Paraquat is a powerful herbicide used to kill weeds on crops like almonds, grapes, and cotton. It’s been a common tool in California agriculture for decades, with millions of pounds sprayed each year — primarily in the San Joaquin Valley. No state has used more of it.

The problem is its toxicity. Paraquat is banned in more than 60 countries, and the U.S. Environmental Protection Agency notes that “one small sip can be fatal and there is no antidote.”

According to Los Angeles Times reporting, the California Department of Pesticide Regulation announced that all manufacturers of paraquat products have “voluntarily canceled” their registrations, with the final cancellation on August 6, 2026. That effectively ends the herbicide’s use in the state.

A state reevaluation identified a potential association between paraquat exposure and thyroid impacts, birth defects, and harm to birds and wildlife. Rather than submit new safety data, the companies chose to withdraw their products instead. California is phasing out paraquat after every manufacturer voluntarily pulled it from the market in 2026.

The Serious Health Risks Linked to Paraquat

The health concerns around paraquat are what make this story so serious for the people who handled it.

Parkinson’s Disease

The most widely reported concern is Parkinson’s disease, a neurodegenerative disorder that affects movement. Thousands of workers have filed lawsuits alleging that exposure to paraquat contributed to their diagnosis.

It’s important to be straightforward here: the science is still evolving. Some studies have linked paraquat exposure to Parkinson’s, while others have found no clear connection, and the manufacturer rejects any claim of a link. No one can promise how a court will view the evidence in a given case.

Thyroid Problems and Birth Defects

California’s own reevaluation pointed to a possible association between paraquat exposure and thyroid impacts as well as birth defects. These findings helped drive the state’s decision to move away from the chemical.

Acute Exposure Dangers

Beyond long-term risks, paraquat is acutely toxic. In March 2026, roughly 60 gallons spilled from a truck in the Siskiyou County town of Dorris, prompting shelter-in-place orders for about 600 residents because of airborne hazards.

Paraquat has been associated with Parkinson’s disease, thyroid problems, and birth defects — though the science continues to develop.

The Lawsuits Already Moving Forward

You’re not the first person to connect paraquat with serious illness. Thousands of workers have already sued Syngenta, one of the herbicide’s largest manufacturers, claiming that exposure caused their Parkinson’s disease.

Legal experts note that voluntary cancellations like this one can sometimes signal that a company believes further safety studies would be too costly or too damaging to pursue. That doesn’t prove anything on its own, but it shows how much scrutiny these products now face.

For people who worked around paraquat for years, this growing wave of litigation is a signal worth paying attention to. Thousands of exposure lawsuits are already underway against the manufacturer, and the legal landscape is active.

Who May Qualify to File a Claim

You may have a potential claim if you were exposed to paraquat and later developed a serious health condition. Generally, that means:

You worked with or around paraquat — as a farmworker, applicator, mixer, or in nearby agricultural communities
Much of California’s exposure happened in the San Joaquin Valley, where the herbicide was heavily used
You later developed a serious diagnosis, such as Parkinson’s disease
Your condition can potentially be connected to that exposure through medical and work history

Farmworkers and licensed applicators are at the center of these cases because they often had the most direct, repeated contact with the chemical. But people who lived or worked near sprayed fields may also have been exposed.

If any of this describes your situation, it’s worth having a professional review the facts rather than assuming you don’t qualify. Farmworkers, applicators, and those exposed in the San Joaquin Valley may qualify if they developed a serious condition tied to paraquat.

The California Law Behind These Claims

You might wonder who could even be held responsible. These cases generally aren’t about your employer or the farm — they target the companies that made and sold the chemical. California law provides two main legal theories.

Product Liability

A product liability claim argues that paraquat was unreasonably dangerous. If a product carries an unreasonable risk of harm when used as intended, the maker can be held responsible for the injuries it causes — even without proof that the company was careless.

Failure to Warn

A failure-to-warn claim focuses on what the manufacturer disclosed. Companies have a duty to warn users about known risks. Many lawsuits allege that paraquat makers understood the potential dangers but failed to adequately warn workers and the public. When a company stays silent about a risk you’d have wanted to know, that silence can support a claim.

These cases typically hold the manufacturer accountable through product liability and failure-to-warn claims — not your employer.

What Damages You May Recover

A serious illness costs far more than medical bills. Under California law, an injured person can generally seek compensation for the full scope of the harm, which may include:

Medical expenses — treatment, medication, and future care
Lost wages — income missed during illness and treatment
Lost earning capacity — reduced ability to work going forward
Pain and suffering — the physical and emotional toll of the condition
Emotional distress — anxiety, depression, and related harm
Loss of enjoyment of life — the activities and independence the illness takes away

The severity and permanence of the condition tend to shape what a claim is worth. Progressive diseases like Parkinson’s carry weight the law recognizes. Compensation can cover medical care, lost income, and the personal toll — not just immediate costs.

The Statute of Limitations and the Discovery Rule

California sets a firm time limit on injury claims. Under the statute of limitations, you generally have two years to file a personal injury lawsuit. Miss that window, and you can lose your right to compensation entirely.

Here’s why exposure victims shouldn’t assume they’re too late. California follows the discovery rule, which means the two-year clock often doesn’t start until you knew — or reasonably should have known — that your illness was linked to paraquat.

For someone diagnosed with Parkinson’s years after their exposure, that distinction can make all the difference. The clock may not have started when you think it did.

These rules are nuanced and depend on your exact facts, so the safest step is to have your situation reviewed promptly rather than count yourself out. Gather your work history, note when your symptoms began, and save your medical records now. The discovery rule may protect people whose diagnosis came years after exposure — your filing window may still be open.

Key Takeaways

California is phasing out paraquat after all manufacturers voluntarily canceled their registrations in 2026.
The herbicide has been associated with Parkinson’s disease, thyroid problems, and birth defects, though the science is still developing.
Thousands of lawsuits are already moving against the manufacturer.
Farmworkers and those exposed in the San Joaquin Valley may qualify for a claim.
The discovery rule may extend your deadline, but acting promptly protects your rights.

Get Your Free Consultation Today

Living with a serious diagnosis is hard enough without wondering whether a chemical you trusted to be safe played a role. You shouldn’t have to face a large corporation alone while you’re focused on your health and your family.

At Walch Law, we help injured people across California connect their illness to a potentially dangerous product, gather the records that support a claim, and pursue the full compensation the law allows. We handle these cases with the care and respect they deserve.

We work on a contingency fee basis — you pay nothing out of pocket, and we only collect a fee if we recover for you. There’s no financial risk in finding out where you stand.

Contact Walch Law today for a completely free, confidential consultation. Tell us what you’ve experienced, and we’ll give you an honest assessment and the next steps that make sense for you.