In Chevron U.S.A. Inc. v. County of Monterey (2023) 15 Cal.5th 135, the California Supreme Court held that Measure Z, a local ordinance banning certain oil production methods, was preempted by state law governing the regulation of oil wells.
Measure Z was sponsored by Protect Monterey County (PMC) and passed by Monterey County


The United States Supreme Court will not be taking up the California Supreme Court’s July 2017
On July 27, the California Supreme Court released its long-awaited decision in
The extent to which the federal Interstate Commerce Commission Termination Act (ICCTA) preempts CEQA has been a topic of much scrutiny recently. Currently pending before the California Supreme Court is Friends of the Eel River v. North Coast Railroad Authority (Case No. S222472), which will address whether the ICCTA preempts CEQA review of a state agency’s proprietary acts with respect to a state-owned or funded rail line (which is at issue in both that case and in Town of Atherton v. California High Speed Rail Authority (2014) 228 Cal.App.4th 314). The case has been fully briefed since April 2015 and is awaiting oral argument.
2015 was a banner year for CEQA rulings by the California Supreme Court, with four decisions handed down, each of which addressed key issues in the application of the statute and its governing regulations: