A federal judge has ruled in favor of the U.S. Navy in a lawsuit over fuel discharged into Pearl Harbor, despite finding that an environmental group had established Clean Water Act violations when it filed the case.
U.S. District Judge Leslie E. Kobayashi ruled on October 28, 2026, that repairs to the Navy's fuel infrastructure and changes to its operations had eliminated the reasonable likelihood of further unlawful discharges. The decision followed a three-day trial over petroleum releases into Pearl Harbor and nearby Hālawa Stream from pipelines at Joint Base Pearl Harbor-Hickam.
The lawsuit stemmed from fuel releases at two Navy piers in 2020 and 2021. Petroleum entered Pearl Harbor, also known as Puʻuloa, and Hālawa Stream from a pipeline at Hotel Pier in March and June 2020. Another pipeline at Kilo Pier released fuel into the harbor for approximately one week in July 2021. The Navy subsequently isolated the damaged pipelines, drained affected fuel lines and began repairs.
Wai Ola Alliance filed suit in June 2022, arguing that aging infrastructure, inadequate maintenance and fragmented oversight created an ongoing risk of unlawful fuel discharges. The environmental group sought a court order requiring the Navy to take additional measures to prevent further pollution.
During the trial, held from March 31 through April 2, the Navy presented evidence of pipeline repairs, upgraded pressure-relief systems, new inspection procedures and changes to its maintenance oversight. Active pipelines at Hotel Pier and Sierra Pier passed annual pressure testing in 2025, while other lines remained isolated pending repairs or replacement.
The military also removed more than 104 million gallons of fuel from Red Hill's underground storage tanks during a defueling operation that began in November 2023. According to the court, the operation was completed without a fuel release.
Red Hill had faced extensive scrutiny following a separate 2021 fuel contamination incident that affected Oahu's drinking water. The Clean Water Act lawsuit concerned discharges from the Navy's fuel distribution system into Pearl Harbor and Hālawa Stream.
Wai Ola Alliance challenged the adequacy of the Navy's corrective measures, citing gaps in maintenance records, divided oversight responsibilities and unfinished repairs. Kobayashi credited testimony from Navy engineers and independent experts who examined the facility's current condition, finding that the improvements had substantially reduced the risk of additional discharges.
The judge found that the environmental group had established violations that were ongoing or reasonably likely to recur when the lawsuit began. But the Navy's subsequent repairs made the Clean Water Act claim moot, leaving the court without a continuing dispute requiring relief.
The Justice Department welcomed the decision on October 30, saying the ruling recognized the Navy's efforts to address the earlier fuel releases and strengthen environmental protections at the base.
Kobayashi entered judgment for the Navy on the Clean Water Act claim. Proceedings on a separate hazardous-waste claim involving Red Hill's underground fuel storage infrastructure remain suspended until August 31, 2027.
