Environmental Groups Sue EPA Over Approval of Potent Chemical Pesticide
Washington, Wednesday, 2 September 2026.
Environmental advocacy groups filed a lawsuit against the EPA’s August 2026 re-approval of trifludimoxazin, arguing the highly potent herbicide poses overlooked health risks, including potential links to cancer.
Legal Challenge Filed Against Federal Approval
On Friday, 28 August 2026, a coalition of environmental advocacy groups initiated a legal challenge in the U.S. Court of Appeals for the 9th Circuit targeting the federal approval of the agricultural chemical trifludimoxazin [1][3]. The plaintiffs, including the Center for Food Safety, the Center for Biological Diversity, and the Pesticide Action & Agroecology Network North America, allege that regulatory agencies overlooked critical long-term environmental and health risks associated with the pesticide [1][4]. This lawsuit directly contests the Trump administration’s Environmental Protection Agency (EPA), marking a significant escalation in regulatory scrutiny over persistent synthetic compounds used in farming [3][5]. The legal action argues that the approval process violated the Federal Insecticide, Fungicide, and Rodenticide Act and the Endangered Species Act [4][5].
Health and Environmental Risk Assessment
Trifludimoxazin is categorized as a per- and polyfluoroalkyl substance (PFAS), often referred to as a ‘forever chemical’ due to its persistence in the environment [3][5]. Internal EPA findings acknowledged that the substance causes thyroid tumors in rodent studies, yet the agency’s final risk assessment concluded there were no human health risks of concern without conducting a cumulative risk assessment for PPO inhibitors as required by law [1][4]. Environmental health scientists warn that the chemical is a likely human carcinogen linked to reproductive harm, birth defects, and neurological deficits in animal studies [1][3]. Furthermore, the herbicide is identified as 10 times more toxic to plants than dicamba, an herbicide previously linked to damage across millions of acres of crops since 2017 [4][5].
Regulatory History and Market Implications
The EPA originally approved trifludimoxazin in 2021 for nationwide application on crops including corn, soy, fruit, and nut crops, but the manufacturer BASF voluntarily withdrew it in 2022 following prior litigation [3][5]. The Trump administration’s EPA proposed re-registration in 2025 before granting final approval in June 2026, making it the fifth PFAS pesticide approved under the second Trump administration [3][5]. Plaintiffs contend that continuing to register new herbicides keeps farmers on a pesticide treadmill and perpetuates herbicide resistance, while posing contamination risks to water and soil in farming communities [1][4]. Following the recent lawsuit, the manufacturer BASF voluntarily agreed to stop selling the product, though the regulatory precedent remains a focal point for agrochemical supply chains [1][5].