The U.S. Supreme Court has agreed to hear a case that could determine whether thousands of Americans who developed cancer after using Roundup weedkiller can continue to sue its manufacturer, Bayer.
At the centre of the case is John Durnell, a Missouri resident who spent years spraying Roundup while maintaining his property. He later developed non-Hodgkin lymphoma, a cancer that attacks the immune system. In 2023, a jury awarded Durnell $1.25 million, finding that Bayer failed to provide adequate warnings about potential cancer risks linked to glyphosate.
Now Bayer wants the Supreme Court to shut the door on similar lawsuits nationwide. While this legal battle is unfolding in the U.S., Roundup remains widely available in Australia, where the same chemical is still sold for home, farm, and council use.
The People Behind the Lawsuits
Durnell is far from alone. Across the U.S., tens of thousands of people say long-term exposure to Roundup through gardening, landscaping, farming, and council work led to serious illness. The most common diagnosis tied to these cases is non-Hodgkin lymphoma, a cancer that affects the lymphatic system.
Some of the most well-known cases include Dewayne Johnson, a California school groundskeeper who developed terminal cancer after heavy exposure, and Alva and Alberta Pilliod, a farming couple who were both diagnosed with the same disease. In multiple courtrooms, juries concluded that Monsanto failed to properly warn users about potential cancer risks.
Why Glyphosate Is So Controversial
Glyphosate has been sprayed on everything from crops to council footpaths since the 1970s. In 2015, the World Health Organization's cancer research agency classified it as "probably carcinogenic to humans." That single phrase helped ignite a legal firestorm.
Plaintiffs allege that long-term exposure increased their cancer risk, that internal documents downplayed safety concerns, and that marketing focused on reassurance rather than caution. Bayer continues to maintain that glyphosate is safe when used as directed.
What Roundup Does to Soil
Glyphosate doesn't just kill weeds. It alters the soil itself, weakening beneficial bacteria and fungal networks that help plants absorb nutrients, leading to poorer soil structure and reduced biodiversity. Once sprayed, it washes into stormwater systems, creeks, rivers, and coastal ecosystems, where it can harm plant life, disrupt fish development, and interfere with amphibian growth cycles. The real concern for human health isn't a single spray; it's chronic exposure over years, with research pointing to potential links with immune disruption, endocrine interference, gut microbiome changes, and increased cancer risk.
(Source: Frontiers in Environmental Science)
What It Does to Waterways
Once sprayed, glyphosate doesn’t stay put.
Rain washes it into stormwater systems, creeks, rivers, wetlands, and eventually coastal ecosystems. In aquatic environments, it can harm plant life, disrupt fish development, and interfere with amphibian growth cycles.
(Source: US Geological Survey)
Urban spraying is especially problematic, because runoff often flows straight into waterways without filtration.
The result is chemical exposure far beyond the garden fence.
What It Does to Humans
The real concern isn’t a single spray.
It’s chronic exposure over years.
Research and legal claims point to potential links with immune disruption, endocrine interference, gut microbiome changes, and increased cancer risk. Occupational exposure for landscapers, farmers, and groundskeepers appears especially concerning.
The scale of litigation, the WHO classification, and the billions already paid in settlements all suggest this isn’t a fringe issue.
What Bayer Is Asking the Court to Do
Bayer’s argument is technical but powerful.
The company claims that because the U.S. Environmental Protection Agency hasn’t required a cancer warning label, individuals shouldn’t be allowed to sue under state laws for failure to warn.
If the Supreme Court agrees, it could wipe out large numbers of current lawsuits and prevent future claims altogether.
(Source: SCOTUSblog)
This case won’t decide whether glyphosate causes cancer.
It will decide whether people can seek legal accountability when regulators haven’t required warnings.
What About Australia
Despite mounting global concern, glyphosate remains fully approved in Australia by the Australian Pesticides and Veterinary Medicines Authority. Roundup is still sold in major hardware chains and agricultural suppliers with no cancer warning labels, no public health alerts, and no meaningful restrictions.
The Bigger Picture
Roundup’s continued use isn’t about safety.
It’s about cost, convenience, and institutional momentum.
The environmental impacts extend beyond human health to soil degradation, waterway pollution, and biodiversity loss. Once you zoom out, glyphosate becomes less of a gardening product and more of a system-wide chemical dependency.
Safer Alternatives
For home gardens, weeds can be managed with manual removal, mulching, boiling water, or vinegar-based solutions.
At an agricultural scale, alternatives focus on reducing chemical dependence, not eliminating weed control entirely. These include mechanical cultivation, crop rotation, cover cropping, targeted spraying, and regenerative farming practices that strengthen soil health and suppress weeds naturally over time.
The goal isn’t weed-free perfection.
It’s fewer chemicals, healthier soil, and less environmental fallout.
The weeds still die.
The ecosystem doesn’t.
🔴 UPDATE: 12 February 2026: Supreme Court Sets April Hearing Date
The U.S. Supreme Court has confirmed oral arguments in the Roundup preemption case are scheduled for April 27. Bayer has been fending off over 100,000 lawsuits since buying Monsanto in 2018 and has so far paid more than $11 billion in settlements and jury verdicts to people suffering from non-Hodgkin's lymphoma they blame on Roundup. The New Lede
At the core of the case is Bayer's argument that because the EPA has approved labels without a cancer warning, failure-to-warn lawsuits should be barred under federal law. Multiple courts have rejected this argument, though one appellate court found in Bayer's favour, creating the circuit split the Supreme Court is now being asked to resolve. The Trump administration is siding with Bayer on the issue, reversing the Biden administration's position. The New Lede
🔴 UPDATE: 17 February 2026: Bayer Announces $7.25 Billion Settlement
This is the biggest financial development in the history of this litigation.
Monsanto has announced a proposed nationwide class settlement worth up to $7.25 billion to resolve both current and future Roundup claims alleging non-Hodgkin lymphoma injuries. Monsanto will make declining capped annual payments for up to 21 years. Bayer
A Circuit Court judge in St. Louis must approve the settlement before payouts can begin. Court documents indicate more than 125,000 plaintiffs have filed suit against the company. STLPR
Plaintiff attorney Eric Holland, who represents a group of claimants, said it was critical to lock in the deal before a potential Supreme Court ruling could undermine the cases. "The failure-to-warn claim is at the very crux," he said. "What every plaintiff says is: you didn't warn me about this danger, and if you would have warned me, I wouldn't have used the product and I wouldn't have gotten cancer."
The settlement does not contain any admission of liability or wrongdoing. To reflect the agreements in its financial statements, Bayer is increasing its overall litigation provisions from 7.8 billion euros to 11.8 billion euros and expects negative free cash flow for 2026. Bayer
Importantly, the Supreme Court case continues regardless. A ruling in Bayer's favour could still shield the company from claims not covered by the settlement.
🔴 UPDATE: 18 February 2026: Trump Declares Glyphosate a Matter of National Security
This is where the story took a turn nobody saw coming.
President Trump signed an executive order directing the Secretary of Agriculture to boost the domestic supply of glyphosate in the name of national security, invoking the Defense Production Act. Civil Eats
The order states that glyphosate-based herbicides are "a cornerstone of this Nation's agricultural productivity" and that lack of access "would critically jeopardize agricultural productivity." It also waives liability for companies complying with the order. White House
The political fallout was immediate. The directive was met with dismay among prominent supporters of RFK Jr's Make America Healthy Again agenda. Toxicologist Alexandra Muñoz called it "outrageous and unacceptable," while anti-glyphosate advocate Kelly Ryerson said glyphosate is the pesticide "MAHA cares about most." Kennedy himself told The New York Times he supported the president's decision. Civil Eats
A draft GOP Farm Bill released around the same time also included a provision that would require uniform pesticide labels nationally, preventing states and local governments from requiring health and safety warnings beyond what the EPA approves, and blocking manufacturers from being held liable for not including such warnings. ACS C&EN
Read together, the executive order and the Farm Bill provision represent a sweeping federal push to insulate glyphosate from both legal and regulatory challenge, even as the $7.25 billion settlement and Supreme Court case play out in parallel.
🔴 UPDATE: 24 February 2026: Monsanto Files Opening Brief at Supreme Court
Monsanto has filed its opening brief before the Supreme Court, urging the justices to reverse a 2025 Missouri Court of Appeals decision and rule that federal law fully preempts state-based failure-to-warn claims. law The brief argues the lawsuits represent a "real threat to farmers" and that EPA approval of labels without cancer warnings should be the final word nationwide.
A ruling is expected before the end of the Supreme Court's current session in June.
What Happens Next
Three things will define this story in the months ahead. The $7.25 billion settlement still requires court approval and individual plaintiffs must decide whether to accept or opt out. The Supreme Court hears arguments on April 27, with a ruling expected by June. And the Farm Bill provision, if passed, could permanently close the door on state-level cancer warning lawsuits regardless of how the court rules.
This case won't decide whether glyphosate causes cancer. It will decide who gets to hold companies accountable and whether a presidential executive order and a farm bill can put that question beyond reach entirely.
We'll be watching.
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