October 12, 2026 CFSI Staff

DOJ Moves to Uphold ESA “Harm” Redefinition, Invoking Post-Chevron Legal Standard

A high-stakes legal showdown over the boundaries of federal environmental law is advancing in the federal courts, carrying potential implications for marine resource management, commercial fisheries, and coastal infrastructure.

The U.S. Department of Justice has moved for summary judgment in four separate lawsuits challenging the administration’s rollback of the regulatory definition of “harm” under the Endangered Species Act (ESA). The core legal question centers on whether federal agencies overstepped their statutory authority by defining “take” to include indirect habitat modification.

In its defense filings, the DOJ highlights the Supreme Court’s overturning of the Chevron doctrine in Loper Bright Enterprises. The government argues that without mandatory judicial deference to agency interpretations, FWS and NMFS must return to the plain, statutory terms of the ESA – which targets direct, intentional actions against individual animals rather than broad landscape or habitat controls.

Opposing environmental groups contend that stripping habitat modification from the definition of “harm” gut protections for vulnerable species. Meanwhile, industry stakeholders and property advocates view the move as a critical step toward curbing regulatory overreach.

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