Responders are actively addressing a reported waste oil spill from the 145-foot U.S.-flagged freight ship Mariana in Tinian Harbor, Commonwealth of the Northern Mariana Islands on June 6, 2025. 

The spill is contained within the relevant boom and is being pushed to the corner of the pier by the wind. 

The cleanup will continue through the night and is estimated to be completed Saturday afternoon.

The U.S. Coast Guard, as the lead federal agency for oil spills in coastal waters, is monitoring response efforts. Responders deployed containment and sorbent booms to prevent the spread of oil in accordance with the vessel’s approved response plan, prioritizing the protection of Tinian’s marine ecosystems. 

Additional response supplies arrived to Tinian from Saipan. A marine science technician from U.S. Coast Guard Marine Safety Unit Saipan is overseeing operations, ensuring compliance with federal regulations and effective containment strategies.

The responsible party took immediate action on detection of the spill from the vessel’s waste oil containment and notified the U.S. Coast Guard on the morning of the incident. 

The operator of the Mariana reported the source secure, no additional leak or discharge, and an estimate around 30 gallons of waste oil. 

The response team is working diligently to contain and clean up the waste oil. 

The Mariana, carrying general cargo, holds a valid Certificate of Inspection issued in March 2024.

An investigation into the cause of the spill is underway, led by the U.S. Coast Guard, given the commercial nature of the vessel. 

The U.S. Coast Guard is collaborating with local agencies, including the Commonwealth of the Northern Mariana Islands Bureau of Environmental and Coastal Quality, to monitor environmental impacts and ensure a thorough response. 

There are no immediate reports of wildlife or shoreline impacts, but monitoring continues.