Oil-contaminated wastewater found in Bangkok has been traced to a fuel pipeline operated by a Bangchak Group subsidiary, according to authorities investigating the incident.
The contamination was discovered along Chuea Phloeng Road and beneath the elevated Rama 3 Road, affecting drainage systems in areas around Khlong Toei and Yannawa districts.
Investigators have been examining an underground pipeline used to transport aviation fuel from Bangchak’s refinery to Don Mueang Airport and an oil terminal in Ayutthaya.
The pipeline is owned by BAFS Pipeline Transportation, while Bangkok Fuel Pipeline and Logistics, a Bangchak Group company, operates the system.
Authorities initially faced difficulties identifying the source of the oil because earlier inspections did not find an obvious crack or rupture in the pipeline.
Bangchak had previously reported that pressure testing showed no leakage from the pipeline. Further inspections were therefore ordered after oil contamination continued to be detected in the surrounding drainage system.
Officials subsequently identified a section of the pipeline that is now being examined as the likely source of the contamination.
Energy authorities have ordered the companies involved to repair the affected pipeline and investigate whether there are other damaged sections. Pipeline operations have also been suspended as investigations continue.
The companies have been instructed to clean up the contaminated areas and restore affected locations. Authorities have also said the operators will be responsible for compensation if their operations are confirmed to have caused damage.
The investigation is also examining whether nearby construction work may have contributed to the problem or affected the underground pipeline.
Authorities have been monitoring the area for safety risks and taking measures to prevent the contamination from spreading through the drainage system.
The incident has prompted closer inspections of the pipeline’s structural condition, with further technical testing planned to determine the extent of any damage.
Officials said identifying the precise cause remains important for preventing a recurrence and ensuring that any affected residents, businesses and communities receive appropriate assistance.
The investigation is continuing as authorities work with Bangchak, BAFS and other agencies to contain the contamination, repair the pipeline and establish how the oil entered Bangkok’s drainage system.
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