February 4, 2026

SF Oil Spill Settlement: Thomas v. City of San Francisco

Explore the $55M settlement in Thomas Logistics v. San Francisco. A major case involving a biodiesel pipeline leak, EPA orders, and environmental liability

Author
Sohini ChakrabortySohini Chakraborty is a lawyer, with over two years of experience in legal research and analysis. She specializes in working closely with expert witnesses, offering critical support in preparing legal research and detailed case studies.

The legal battle between Pilot Thomas Logistics (PTL) and the City and County of San Francisco began after a persistent oil sheen appeared on the San Francisco Bay in August 2020. Federal investigations by the EPA traced the leak to an underground pipeline near Hyde Street Harbor, which PTL operated but the Port of San Francisco had designed decades earlier. PTL alleged that the city provided a defective facility and failed to maintain a functional leak-detection system, leading to a massive red-dye biodiesel spill. This incident forced the closure of PTL’s marine fuel terminal and triggered extensive cleanup and remediation costs. While the city argued that PTL was responsible for the leak due to operational negligence, the parties ultimately reached a $55,000,000 settlement to resolve claims of breach of contract, negligence, and environmental indemnity.

Case Background

The legal battle began when a persistent oil sheen appeared on the surface of the San Francisco Bay in August 2020. This environmental red flag triggered a federal investigation by the United States Environmental Protection Agency (EPA), which eventually traced the source of the leak to an underground fuel pipeline. This specific pipeline, though operated by Pilot Thomas Logistics (PTL), had been designed and constructed by the Port of San Francisco decades earlier.

Cause

The conflict centered on a 140-foot double-walled underground pipeline located near the Hyde Street Harbor. PTL alleged that the pipeline failed because the City and County of San Francisco had provided an inadequate design and failed to maintain the system properly. The situation worsened when the Port’s sensor system, intended to detect leaks in the secondary containment pipe, failed to activate. This failure allowed red-dye biodiesel to saturate the soil and seep into the Bay.

Injury

As the leak continued undetected, the environmental impact grew, eventually forcing the EPA to issue a removal and mitigation order in March 2021. Consequently, PTL had to shut down its marine fuel terminal operations on April 17, 2021. This closure resulted in massive economic losses for the company, as their business remained shuttered while they shouldered the enormous costs of investigating the spill, managing containment booms, and designing a permanent remediation system to extract the biodiesel from the subsurface.

Damages Sought

PTL filed its lawsuit seeking compensatory damages for lost profits and the staggering costs associated with environmental cleanup and remediation. Additionally, the company requested the Court to award prejudgment interest, attorney’s fees, and the total costs of the legal proceedings.

Plaintiff(s): Pilot Thomas Logistics, LLC.

·       Counsel for Plaintiff(s): Tina Van Dam | Mary Katherine Back

Defendant(s): City and County of San Francisco | the Port of San Francisco.

·       Counsel for Defendant(s): David Chiu | Yvonne R. Meré | Jennifer E. Choi | Christopher B. Whitman

Key Arguments or Remarks by Counsel

Counsel for PTL emphasized that the City had essentially leased them a "ticking time bomb" in the form of a poorly designed pipeline. They argued that no amount of operational care could have prevented a leak caused by fundamental design flaws and a sensor system that never worked as promised. Conversely, the City Attorney’s office argued that PTL was a sophisticated operator that had assumed all risks associated with running a fuel terminal. They maintained that the city bore no responsibility for the daily maintenance or the eventual failure of the equipment.

Claims

PTL’s complaint focused on four primary legal theories.

First, they alleged a Breach of Contract, stating the City failed to provide a functional premises as required by the lease.

Second, they brought a claim for Negligence, arguing the City used improper materials and failed to inspect the pipeline.

Third, the company sought Equitable Indemnity, demanding the City pay its fair share of the cleanup costs. Finally, they filed for Contribution, asserting that since the City's actions caused the spill, it should contribute to the financial recovery efforts.

Defense

The City countered with a long list of affirmative defenses. They argued that PTL had Assumed the Risk of the activity and was Comparatively Negligent in its own operations. The City also claimed Immunity under the California Tort Claims Act, asserting that public entities are not liable for certain discretionary acts or conditions. Furthermore, they argued that PTL had failed to Mitigate Damages and that the lawsuit was barred by the Statute of Limitations.

Settlement

Before the jury could deliver a final verdict in the Superior Court, the parties reached a resolution to end the protracted legal battle. The City and County of San Francisco agreed to pay a settlement of $55,000,000 to Pilot Thomas Logistics, LLC. This substantial sum accounted for the business’s lost profits, the extensive environmental remediation required by the EPA, and the legal costs incurred during the dispute. The settlement effectively closed the case, allowing the focus to shift from the Courtroom to the continued restoration of the San Francisco Bay’s waterfront.

Court documents are available upon request at jurimatic@exlitem.com

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