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The Mariveles oil spill in Bataan has affected approximately 500 square meters of coastal waters after an estimated 25 liters of used oil were discovered near Sitio Naswe, Barangay Ipag, on November 5, 2026. The Philippine Coast Guard (PCG) deployed containment equipment and coordinated cleanup operations with local authorities as investigators worked to determine the source of the contamination.

The incident was reported on November 5, 2026, at Sitio Naswe, Barangay Ipag, where approximately 500 square meters of coastal waters were affected.

According to the PCG, the agency received a report of a suspected oil spill at around 9:30 a.m. Initial findings indicated that the substance may have originated from washing activities, although authorities said the source remains subject to further verification.

The incident has prompted an investigation to determine how the used oil entered the coastal waters and whether it resulted from an accidental discharge or another activity.

PCG Deploys Equipment to Contain Oil Spill

Following the discovery, the Philippine Coast Guard coordinated with the Provincial Disaster Risk Reduction and Management Office (PDRRMO) and other local authorities to contain the spill and prevent further contamination.

The response team mobilized seven absorbent booms and 2,200 absorbent pads to support the cleanup operation.

At approximately 3:30 p.m. on November 5, representatives from the PCG, the Municipal Agriculture Office of Mariveles, and Barangay Ipag installed oil spill booms along the affected shoreline.

These containment materials were deployed to help restrict the movement of oil and prevent it from spreading to other coastal areas.

By 6:30 p.m., the response team had collected approximately 800 kilograms of oil-contaminated debris and used absorbent materials. The collected waste was placed in 40 sacks for temporary storage at a secure location.

The PCG said cleanup operations were scheduled to resume on November 6 as authorities continued their response to the incident.

Oil Sheen and Darkened Shoreline Observed

Additional reporting by GMA News described visible oil sheen on the water’s surface and sections of the shoreline turning black in Sitio Naswe.

The report also noted that the smell of oil was noticeable in the area.

The Coast Guard and other concerned agencies conducted an inspection to assess the situation and determine the possible source of the contamination.

Authorities also collected water samples for testing to establish whether the coastal waters had been contaminated.

The results of these tests will be important in determining the extent of the environmental impact and identifying what further response measures may be necessary.

As of the latest available reports, investigators have not publicly established the source of the oil or confirmed the full extent of the contamination.

Concerns Over Coastal Resources and Fishing Communities

The incident has raised concerns about the protection of coastal waters and marine resources in Mariveles, a municipality with communities that depend on coastal and maritime activities.

Oil contamination can potentially affect marine organisms, coastal habitats, and fishing activities, depending on the type of oil, the quantity released, and the duration of exposure.

However, the actual environmental impact of the November 5 incident remains undetermined pending the results of water testing and further assessment by the concerned authorities.

The Bureau of Fisheries and Aquatic Resources (BFAR) and the Department of Environment and Natural Resources (DENR) play important roles in monitoring fisheries resources and assessing environmental conditions during marine pollution incidents.

Any restrictions on fishing or seafood consumption should be based on official assessments and advisories rather than unverified reports.

Mariveles Previously Affected by Major Oil Spill Incidents

The latest incident has also brought renewed attention to Mariveles’ history of oil pollution.

In July and August 2024, Bataan experienced a series of maritime incidents involving the sinking of MT Terra Nova and MT Jason Bradley, as well as the grounding of MV Mirola 1.

These incidents resulted in oil contamination concerns across several coastal communities in the province, including Mariveles.

The 2024 incidents required extensive containment and recovery operations involving the Philippine Coast Guard and other government agencies.

While the November 2026 incident is separate from those earlier maritime accidents, the latest spill highlights the continuing importance of coastal surveillance, proper handling of used oil, and rapid response to reports of marine pollution.

Investigation and Cleanup Operations Continue

The Philippine Coast Guard said it would continue assessing the affected coastal area and coordinating with local authorities to minimize the environmental impact of the incident.

The investigation is expected to help establish the source of the used oil and determine whether further action is necessary.

Authorities are also expected to assess the results of water sampling and monitor the condition of the affected shoreline as cleanup operations progress.

For residents and coastal communities, the findings will be important in understanding whether the incident poses a continuing risk to local marine resources and nearby activities.

The PCG has yet to publicly establish the source of the spill, while the full environmental impact remains subject to further verification.