On October 11, 2025, Governor Gavin Newsom signed Assembly Bill 1319 into law, establishing a new California Endangered Species Act (CESA) mechanism for California to extend state-level endangered species protections to species that may lose federal safeguards under the federal Endangered Species Act (ESA). The statute empowers the California Department of Fish and Wildlife (CDFW) to designate “provisional candidate species” that receive the same protections as state-listed species, including strict prohibitions on “take” and rigorous mitigation requirements.
AB 1319 is California’s direct response to a material shift in federal endangered species law—one triggered by the Supreme Court’s 2024 decision in Loper Bright Enterprises v. Raimondo and the subsequent federal proposal to rescind the regulatory definition of “harm” under the Endangered Species Act. These federal changes threaten to narrow the scope of activities regulated under the ESA, particularly those involving habitat modification. California’s new law seeks to ensure that species native to the state will continue to receive protection even if federal safeguards are reduced or eliminated.
The implications are significant: there are dozens of federally listed or candidate species native to California that are not currently protected under CESA—any of which could become provisional candidates under AB 1319 if federal protections are reduced. California’s new law seeks to ensure that these species will continue to receive protection even if federal safeguards are eliminated.
Natural Resources and Mining Law Blog

