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The U.S. Supreme Court issued on June 25, 2026, a significant decision affecting pesticide regulation, product liability and federal preemption. In Monsanto Co. v. Durnell, the Supreme Court held 7–2, in an opinion authored by Justice Brett Kavanaugh, that once the U.S. Environmental Protection Agency (EPA) has approved a pesticide label under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA), state law generally cannot impose additional or different warning requirements through civil litigation. The ruling reaffirms the EPA’s primary authority over pesticide warning labels under FIFRA.
Lawsuit origins
The case involved allegations that long-term exposure to a glyphosate-based herbicide caused cancer and that the manufacturer should have included warning language beyond what appeared on the EPA product label. The Supreme Court rejected that argument, concluding that EPA labeling requirements establish the controlling federal standard for pesticide warnings. Allowing individual state courts or juries to impose different warning requirements would undermine the uniform national regulatory framework established by Congress through FIFRA.
Although Monsanto v. Durnell arose from a personal injury claim, the Supreme Court’s reasoning may have broader implications for future pesticide-related litigation, including certain property damage and failure-to-warn claims.
FIFRA preemption
For decades, pesticide regulation in the United States has operated under a clear structure: The EPA reviews the scientific data, approves the label, and that label becomes the legally enforceable standard governing product use. In Monsanto v. Durnell, the Supreme Court reaffirmed that Congress intended FIFRA to establish a uniform national system of pesticide labeling rather than a patchwork of differing state warning requirements. The Supreme Court emphasized that pesticide labels are federally mandated regulatory documents carrying legal force.
The Supreme Court also recognized the practical difficulties that would arise if state courts and juries could independently impose varying warning requirements. Congress designed FIFRA’s regulatory framework to preserve national consistency in pesticide regulation and labeling. FIFRA does allow some state regulatory authority over pesticide sale and use, but state labeling requirements are specifically prohibited.
The decision was not unanimous. Justices Ketanji Brown Jackson and Neil Gorsuch dissented, arguing that Missouri’s failure-to-warn claim was equivalent to FIFRA’s own misbranding prohibition and therefore not preempted, and that manufacturers can add certain warnings as minor modifications without prior EPA approval. The majority rejected both arguments, emphasizing that the EPA had specifically and repeatedly evaluated glyphosate over more than three decades — concluding each time it is not likely to cause cancer, a view shared by regulators in Canada, Australia, Japan and the European Union.
Implications for PMPs
For pesticide manufacturers, registrants and pest management professionals (PMPs), the practical significance of Monsanto v. Durnell is straightforward: EPA-approved pesticide labels remain the controlling federal standard for warnings and directions for use. The decision reinforces the EPA’s central role in pesticide regulation and confirms that parties subject to FIFRA generally should not be required to create or communicate warning statements beyond those required by the EPA.
The decision does not alter manufacturers’ ongoing obligations under FIFRA. Rather, the Supreme Court reaffirmed that the EPA, not individual juries, is principally responsible for determining the content and adequacy of pesticide warnings.
For PMPs, the longstanding principle remains unchanged: Read the label, follow the label and document compliance. This decision strengthens the defense against civil claims that a PMP should have warned customers beyond what the EPA-approved label requires. It does not, however, eliminate liability for misapplication, off-label use, or negligent service work; proper practice and documentation remain essential.
As courts continue to address pesticide litigation, Monsanto v. Durnell is likely to become one of the most significant Supreme Court decisions affecting pesticide regulation, FIFRA preemption and product liability in recent decades.
