PCD extends probe into blackened Saraburi canal

The Pollution Control Department (PCD) is intensifying its investigation into the severe pollution of the Takhe canal in Saraburi, which has turned black. Officials are seeking enhanced cooperation between agencies to pinpoint the source of illegal waste discharges, acknowledging that laboratory testing alone cannot identify responsible parties.

Department chief Surin Worakijthamrong explained that a combination of chemical analysis and field sampling is being employed. The investigation divides the affected area into three zones: near industrial facilities, nearby communities, and the local waterworks system. Preliminary findings in Zone A, near industrial sites, revealed unusually high electrical conductivity (EC) levels and the presence of volatile organic compounds (VOCs). These indicators strongly suggest an industrial origin, as such substances are not naturally occurring.

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We cannot yet determine the exact source of the pollution, but agricultural activity appears highly unlikely. Heavy metal analysis may help identify the type of industrial activity involved, though it may not be enough to pinpoint the plant responsible.

However, identifying the specific facility responsible remains difficult. While lower dissolved oxygen levels in Zone B indicate deteriorating water quality affecting nearby communities, Zone C showed no contamination. Authorities are awaiting further laboratory results, including heavy metal analysis, which may help narrow down the type of industrial activity involved. Agricultural activity has been ruled out as a likely source. Officials are also collaborating with space technology and research institutes for additional evidence, recognizing that even confirmed industrial contamination will require further coordination to trace discharge routes and verify the exact source among the nine inspected industrial facilities, many involved in waste recycling and landfill management.

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We will seek further cooperation from the Geo-Informatics and Space Technology Development Agency and the Synchrotron Light Research Institute to gather more evidence.