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Illegal Industrial Waste Dumping Incident on Teshima Island, Kagawa Prefecture, Seto Inland Sea - November 1994 In 1994, it was discovered that large quantities of industrial waste had been illegally dumped on Teshima Island in Kagawa Prefecture, Seto Inland Sea. In this incident, approximately 54 hectares of Teshima Island were illegally filled with waste materials including automobile shredder dust, construction debris, and plastic waste. The total volume was estimated at approximately 500,000 tons. Leaching tests conducted by the Environment Agency and the Ministry of Health and Welfare confirmed the presence of hazardous substances including lead, cadmium, and hexavalent chromium. Lead contained in the shredder dust, in particular, was feared to contaminate groundwater and soil, posing health risks to nearby residents and threatening agricultural damage. Toshima Island, originally part of the Seto Inland Sea National Park, boasts beautiful natural landscapes. This illegal
dumping was deemed to have a devastating impact on the local environment and ecosystem. The waste disposal company responsible for the illegal dumping was "Toshima Sangyo," headquartered in Osaka Prefecture. The company is said to have engaged in illegal dumping to cut costs. In response, local residents and environmental groups protested strongly, prompting Kagawa Prefecture and the Environment Agency to request action from the Central Environment Council. As a result, industrial waste management standards were significantly strengthened, with legal regulations on disposal methods for shredder dust and hazardous waste being revised. After the incident, Kagawa Prefecture implemented measures to restore Teshima's environment, advancing waste removal and soil decontamination. The removal operations incurred enormous costs, with approximately 70 billion yen spent by 2020. This incident became a symbolic case of waste disposal problems within Japan, significantly influencing su
bsequent legal revisions and environmental protection policies. File name: 4-1994-11-15