Prop 45 would have amended CEQA to limit public review of new developments to only "essential" environmental and public health impacts—a standard that critics warned was dangerously vague. Supporters, including the California Chamber of Commerce and the California Council for Affordable Housing, argued that CEQA has been weaponized by NIMBY opponents to block housing and delay hospitals, driving up costs for housing, electricity, and water. Pro-development groups like YIMBY Action and California YIMBY stayed neutral, while the Sierra Club, the California Democratic Party, and the Greenbelt Alliance led the opposition.

Environmental advocates celebrated the outcome. "When we can't rely on the federal government to protect our communities and the environment, we need strong state laws to keep us safe," said Aruna Prabhala, an attorney at the Center for Biological Diversity, in a statement. "I hope developers heard us loud and clear. We're not interested in giving polluting projects a free pass."

Earthjustice noted that data center and warehouse developers, for-profit utilities, and other special interests spent tens of millions of dollars to pass the measure. "With this vote, Californians made it clear that they want a voice in how and where projects in their communities are built," said Sean B. Hecht, managing attorney of Earthjustice's California Regional Office. "CEQA is often the only line of defense for communities living in the shadow of proposed freeways, warehouses, and industrial sites."

The measure's defeat comes despite Governor Gavin Newsom's past criticism of CEQA's "weaponization," which he said had led to "years and years of BS." Newsom remained officially neutral on Prop 45. Business groups signaled they will continue pushing for reform. "This election has come to an end, but the journey is far from over," said Jennifer Barrera, CEO of the California Chamber of Commerce. "We will continue to advocate for reform that's both comprehensive and consequential, and we will hold elected officials accountable for whether they take action that makes a difference."

For local communities, the result means CEQA's public review process remains fully intact, preserving residents' ability to weigh in on projects that affect their neighborhoods—from freeway expansions to industrial sites. The vote also underscores deep divisions over how to balance California's housing crisis against environmental protections, a debate likely to continue in the Legislature.