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

On Tuesday, February 25, 2020, the Fifth Appellate District invalidated Kern County’s 2015 Oil and Gas Ordinance (the “Ordinance”), which was intended to streamline the permitting process for a variety of oil and gas activities within unincorporated portions of the County, including for oil and gas production wells and related infrastructure such as well pads