Chevron Richmond Refinery Fire: Health, Lawsuits, and Safety Reforms

The Chevron Richmond refinery fire of August 6, 2012, began when a badly corroded eight-inch pipe ruptured inside the No. 4 Crude Unit, released a cloud of flammable vapor that engulfed 19 workers, and ignited into a blaze that pushed a plume of black smoke across the East Bay. Roughly 15,000 residents sought emergency care in the days that followed.¹ Chevron later pleaded no contest to six criminal misdemeanors, paid tens of millions of dollars in fines and settlements, and California overhauled its refinery safety rules in response.

What Happened on August 6, 2012

At about 6:15 p.m., a pipe carrying hot crude oil began leaking hydrocarbon vapor inside the crude unit.²³⁴

Contra Costa County issued a Level 3 shelter-in-place order at 6:38 p.m. for Richmond, San Pablo, and North Richmond. It stayed in effect until 11:12 p.m.⁵ The county’s Community Warning System, criticized after a similar 2007 refinery incident, failed again. Richmond City Councilman Tom Butt said he did not get his warning call until 9:30 p.m., three hours after the explosion. Many residents received no call at all; others were reached only after smoke and particulates had already drifted into their homes.⁶

Why the Pipe Failed

The pipe had been installed in 1976 and had been thinning for years from sulfidation corrosion, a process in which sulfur compounds in crude oil attack steel at high temperatures. Metallurgical testing found the pipe contained very low concentrations of silicon, which accelerated the corrosion dramatically.⁷ The CSB found that carbon steel with less than 0.10 weight percent silicon could corrode up to 16 times faster than higher-silicon steel in the same piping circuit.⁸ During a 2011 turnaround, inspectors measured wall thickness only at elbows, which are less prone to sulfidation, and missed the badly thinned straight sections.³

Chevron had internal warnings. After identifying sulfidation problems at its Salt Lake City refinery in 2002, the company inspected the Richmond facility, and its own personnel made at least six recommendations over ten years to upgrade the metallurgy of the very pipe that later ruptured, in 2002, 2006, 2007, 2009, and twice in 2011. Management did not carry out the upgrades.³ Chevron’s own inspectors had recommended replacement as early as 2002, according to Ellen Widess, then chief of the California Division of Occupational Safety and Health.⁹

The 2012 fire was also not the first serious incident at the refinery. A lawsuit filed against Chevron documented 14 incidents over 25 years, including a 1989 fire that injured workers, a 1999 fire whose smoke overwhelmed nearby neighborhoods, and a 2007 sulfidation-corrosion fire that triggered a five-hour shelter-in-place order and sent residents to emergency rooms. The warning system malfunctioned in 2007 too, and officials promised then to fix it.¹⁰⁶

The Health Impact on Richmond

More than 15,000 people sought treatment at area emergency rooms in the days after the fire, most for breathing difficulties. About 20 were admitted as inpatients.¹¹⁵ Daily emergency department visits at two nearby hospitals jumped from fewer than 80 to peaks of 817 and 439 in the first week. Volumes took four weeks to return to normal.¹²

Symptoms included irritated eyes, nose, and throat, coughing, chest pain, headaches, anxiety, and worsened asthma. In communities placed under the shelter-in-place order, emergency visits rose by a factor of 3.7; in nearby communities that received no warning, visits still climbed by a factor of 1.5.¹² Health experts said most acute symptoms were expected to resolve, but Dr. John Balmes of the UC Berkeley School of Public Health warned smoke exposure could permanently worsen asthma in people with underlying conditions, and Dr. Wendel Brunner of Contra Costa Health Services pointed to lasting anxiety among residents living near the refinery.¹¹ A five-year follow-up found that while most conditions were transient, many plaintiffs in related litigation reported persistent respiratory issues or a need for stronger asthma medications.

What the CSB Investigation Concluded

The U.S. Chemical Safety Board opened its investigation immediately and issued its final report on January 28, 2015. Its central finding was that Chevron could have prevented the fire by following its own internal recommendations to replace the corroded carbon steel piping with a more resistant alloy.⁷¹³

The board identified failures across several layers of the refinery’s safety management. Chevron lacked adequate methods for identifying individual low-silicon pipe components corroding far faster than the circuit around them. Although Chevron’s own policies required the use of inherently safer technology, management repeatedly rejected internal recommendations to upgrade the piping metallurgy. After the fire, Chevron rebuilt the crude unit using 9-Chrome alloy rather than the stainless steel the CSB considered safest, without a documented review of inherently safer alternatives; the company had installed stainless steel in a nearly identical unit at its El Segundo refinery in 2001. The refinery had no process for tracking deferred or denied maintenance work, and its inspection methodology missed the most vulnerable sections of pipe. The CSB also found the refinery lacked adequate protocols for isolating equipment or shutting down units when leaks were detected.³

Criminal Charges and Cal/OSHA Penalties

On August 5, 2013, Chevron U.S.A. Inc. pleaded no contest to six misdemeanor criminal charges filed jointly by the California Attorney General and the Contra Costa County District Attorney. The charges included failure to correct deficiencies in equipment, negligent emissions, and failure to protect employees from hazardous conditions.¹⁴ The court placed Chevron on three and a half years of probation and ordered $2 million in fines and restitution, including $1.28 million in fines, reimbursements to the Bay Area Air Quality Management District and the Attorney General’s office, and a $145,000 contribution to Richmond BUILD, a workforce training partnership.¹⁵ No individual employees were charged.

Cal/OSHA issued 25 workplace safety citations in January 2013, including 11 willful-serious violations, 12 serious violations, and two general violations, with proposed penalties of $963,200.¹⁶ Investigators found Chevron had failed to follow its own inspectors’ recommendations to replace the corroded pipe, failed to follow emergency shutdown procedures, and failed to protect employees.¹⁷ Chevron initially appealed. The case settled in July 2017: the company paid the original penalty plus an additional $227,300, and Cal/OSHA withdrew nine of the 17 citations still in dispute and downgraded several others. In exchange, Chevron agreed to replace carbon steel piping carrying corrosive liquids with chrome-alloy piping at an estimated cost of $15 million, to develop new equipment monitoring procedures at an estimated $5 million, and to provide specialized incident command training to its fire department and additional process safety management training to operators.¹⁸

Civil Lawsuits by Residents and the City

A group of 4,296 residents sued Chevron in Contra Costa County Court, alleging negligence, battery, public and private nuisance, and strict liability for ultrahazardous activities, among other claims. They described Chevron’s conduct as “despicable, intentional, reckless and grossly negligent” and asked the court to order the company to install a citywide warning system, fund local health clinics, and conduct annual testing of Richmond’s water, soil, and air, in addition to seeking monetary damages.⁶

The City of Richmond filed its own lawsuit in 2013, alleging willful disregard for public safety. It settled in May 2018 when the city council voted 5-0 to accept $5 million, directed toward public safety, education, parks and recreation, and community development. Chevron admitted no fault and was not required to make any changes at the refinery. Before the settlement, a Contra Costa County Superior Court judge had dismissed two of the city’s claims, ruling that Richmond had not proven Chevron engaged in ultrahazardous activity and rejecting a claim for lost property tax revenue.¹

How California Rewrote Refinery Safety Rules

The fire became the catalyst for the most significant overhaul of refinery safety regulation in California in decades. Governor Edmund G. Brown Jr. established an Interagency Working Group on Refinery Safety, made up of 13 agencies and the Governor’s office, which issued a February 2014 report titled “Improving Public and Worker Safety at Oil Refineries.” The report called for streamlined regulatory coordination, clear criteria for unified emergency response, mandatory implementation of inherently safer systems, periodic safety culture assessments, better public access to air quality monitoring data, and more than doubling the staff enforcing refinery safety rules.¹⁹

An Interagency Refinery Task Force stood up in August 2013 to oversee implementation, and on October 1, 2017, new regulations took effect overhauling both Cal/OSHA’s workplace safety standards and the California Accidental Release Prevention (CalARP) program. The rules require refineries to adopt inherently safer designs and systems “to the greatest extent feasible,” raise employer accountability for mechanical integrity, mandate periodic safety culture assessments, give refinery personnel authority to shut down units in an emergency, and require annual public reporting of safety metrics.²⁰ Contra Costa County and the City of Richmond revised their local Industrial Safety Ordinances to fold in the CSB’s recommendations.²¹

The legislature also passed Senate Bill 54 in October 2013, requiring outside contractors performing work at California oil refineries to use a skilled and trained workforce for occupations covered by state-approved apprenticeship programs. Lawmakers found that unskilled contract workers posed elevated risks because they were less familiar with facility operations and emergency plans. A legal challenge was dismissed in December 2016 and the plaintiffs dropped their appeal in September 2017.²²

Continuing Enforcement at the Refinery

Regulatory pressure on the Richmond refinery didn’t end with the fire-related penalties. In February 2024, the Bay Area Air Quality Management District settled 678 pending air pollution infractions at the refinery, a five-year backlog described as ranging from dangerous flaring to failures to submit timely records. The settlement required a $20 million payment.²³ Under a broader agreement that also resolved Chevron’s legal challenge to a new particulate matter rule, the company agreed to pay another $20 million into a Community Air Quality Fund, with $20.5 million annually after 2026, and to install wet gas scrubber technology. Chevron faces penalties that could total more than $130 million if it misses the July 2026 compliance deadline for the particulate rule.²⁴

In December 2025, the Air District fined Chevron an additional $900,000 after an audit found 20 of its air pollution monitors improperly configured in a way that limited their ability to detect the full range of potential emissions. The district issued nine notices of violation after Chevron missed a deadline to upgrade the equipment.²⁵

1
KQED. Chevron, Richmond Move to Settle Lawsuit Over 2012 Refinery Fire
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Bay Area Air Quality Management District. Chevron Refinery Fire
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U.S. Chemical Safety Board. CSB Draft Interim Report on 2012 Chevron Fire
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Press-Telegram. Investigator: Chevron’s Richmond Refinery Fire Near Disaster for Workers
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U.S. Chemical Safety Board. Chevron Richmond Refinery Interim Investigation Report
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Courthouse News Service. Giant Refinery Explosion Leads 4,296 to Sue Chevron
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U.S. Chemical Safety Board. Chevron Richmond Refinery Fire
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U.S. Chemical Safety Board. Chevron Richmond Refinery Final Investigation Report
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Chemical & Engineering News. Neglected Corrosion of Pipe Led to Chevron Fire
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United Steelworkers. Like a Bad Neighbor, Chevron Is There
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Richmond Confidential. Health Experts Find Minimal Long-Term Effects From Refinery Fire
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National Institutes of Health (PMC). Emergency Department Visits After the 2012 Richmond Refinery Fire
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ISHN. CSB: Chevron Could Have Prevented Richmond Refinery Accident
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East Bay Times. Chevron Pleads No Contest to Criminal Charges Stemming From Richmond Refinery Fire
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CBS News Sacramento. Chevron Agrees to Pay $2 Million for Richmond Refinery Fire
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California Department of Industrial Relations. Interagency Refinery Task Force
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U.S. Chemical Safety Board. CSB Releases Technical Report on Chevron 2012 Pipe Rupture and Fire
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California Department of Industrial Relations. Cal/OSHA Settlement Agreement With Chevron
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CalEPA. Final Refinery Safety Report Calls for Greater Collaboration and Oversight
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CalEPA. New Regulations Improve Safety at Oil Refineries
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U.S. Chemical Safety Board. California Refinery Safety Recommendations
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California Building Trades. Building Trades Score Big Fed Court Win on SB 54
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Richmond Confidential. Richmond Chevron BAAQMD Violations Pending
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KQED. Bay Air District Hails Decisive Victory in Battle to Cut Refinery Pollution
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Bay Area Air Quality Management District. Chevron Settlement