BAY AREA, CA — Chevron reported a hydrocarbon spill that reached the waters of the San Francisco Bay, triggering a Community Warning System Level 1 notification and an investigation into the release.
Chevron said in a Facebook post that the leak into the Bay occurred Wednesday afternoon while workers were performing maintenance at the company's Richmond Refinery Long Wharf about 25 miles from Concord.
The company said less than one barrel — fewer than 42 gallons — of hydrocarbon liquid entered the Bay before crews activated spill response procedures and notified state, federal, and local agencies.
Chevron did not identify in the announcement the specific hydrocarbon involved.
A Community Warning System Level 1 notification was issued to inform residents about the leak into the Bay.
Under Contra Costa County's warning system, a Level 1 alert is an awareness message used for incidents that may involve odors, visible emissions, or other events that are not expected to pose a significant public health threat.
A Level 1 notification does not include shelter-in-place orders or other protective actions for the general public.
Chevron described the material only as a hydrocarbon liquid. Hydrocarbons are compounds made of hydrogen and carbon and are the primary components of crude oil, gasoline, diesel fuel, jet fuel, and many refinery products.
The environmental effects depend on the specific product. But even relatively small releases typically trigger containment efforts and regulatory review because petroleum products can harm sensitive aquatic habitats.
The SF Bay is a tidal estuary that connects the Sacramento-San Joaquin River Delta to the Pacific Ocean via the Golden Gate. Multiple cities and counties share the waterway.
Significant public health concerns are more commonly associated with larger releases, fires, or airborne emissions.
While Wednesday's release was relatively small, it adds to a series of refinery incidents that have drawn public attention in recent years.
In May 2025, the refinery experienced three separate flaring incidents that prompted air quality advisories. The refinery has also entered regulatory settlements over alleged air quality violations, while continuing to report flare events associated with equipment failures, power disruptions, startups, and planned maintenance.
Regulatory agencies, including the U.S. Coast Guard, California Office of Spill Prevention and Response, Bay Area Air Quality Management District, and Contra Costa Health, typically review refinery spills and determine whether additional cleanup or enforcement actions are warranted.
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Concord, CA Patch
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