Enviros sue EPA over pesticide approval

By Ellie Borst | 01/15/2026 01:34 PM EST

The agency has found isocycloseram can pose significant health risks to humans and at-risk species in certain conditions.

A "Do Not Enter" sign marks a field of cabbage during the spraying of pesticides.

A "Do Not Enter" sign marks a field during the spraying of pesticides near Chualar, California, in 2002. Mike Fiala/AP

Environmental advocacy groups are suing EPA over its decision to approve a pesticide found to be highly toxic to bees, fish and other species.

The petition, filed Thursday in the 9th U.S. Circuit Court of Appeals, claims EPA violated federal pesticides and endangered species laws by registering products containing isocycloseram, used to fend off cockroaches and other unwanted pests on farms and in buildings.

The agency in its own assessment found isocycloseram could lead to reduced testicle size, lower sperm count and liver toxicity. The agency also predicted the chemical could have adverse effects on more than 1,000 threatened or endangered species — a threat water agencies and environmentalists have flagged for concern.

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Regulators said those risks can be avoided if the pesticide is used according to the restrictions on the required label.

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