In 2025, Idemitsu Kosan conducted an environmental assessment and disclosed corporate waste management data in accordance with recognized sustainability reporting standards.The company provided a breakdown of its waste by type (hazardous vs non-hazardous) and treatment method (recovery vs disposal), enabling greater transparency into its waste handling and environmental practices.
| Metric (tonnes) | 2025 | 2024 | 2023 | 2022-2019 |
|---|---|---|---|---|
Total Waste Generated | 238,983a | 218,202a | 242,238a | |
Total Waste Recovered | 120,906a | 101,714a | 115,369a | |
Total Hazardous Waste Generated | 21,741a | 16,420a | 14,274a | |
Non-Hazardous Waste Disposed | 321a | 468a | 82a |
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In 2025, Idemitsu Kosan generated a total of 238,983metric tonnes of waste.a
Of this amount, 50.59% of Idemitsu Kosan's total waste generated was recovered through methods such as recycling, reuse, or composting, while 0.13% was disposed of through landfilling, incineration, or combustion.The remaining 49.27% was either treated using unspecified methods or not clearly categorized.a
In 2025, Idemitsu Kosan reported a total waste generation of 238,983 metric tonnes, of which 50.59% was recovered through recycling, reuse, or composting.This moderate level of recovery indicates that Idemitsu Kosan is taking steps toward improving its waste diversion practices, though there is still room to enhance recycling and recovery efforts.a
Since 2023, Idemitsu Kosan's total waste generation decreased by 1.34%, yet rose by 9.52% in 2025, potentially indicating a temporary operational shift or inconsistency in waste management outcomes.a
Over the same period, Idemitsu Kosan's waste recovery rate increased by 6.23%, including a 8.53% rise in 2025, indicating growing emphasis on circularity and improved operational practices for diverting waste from disposal.a
Overall, Idemitsu Kosan has reduced its waste footprint over time and continues to strengthen its recovery efforts, despite a recent uptick in waste output. This may reflect short-term operational shifts rather than a long-term reversal.
In 2025, Idemitsu Kosan generated a total of 238,983 metric tonnes of waste.a
Of this amount, 9.1% of Idemitsu Kosan's total waste generated of was classified as hazardous waste, characterized by properties such as toxicity, flammability, corrosiveness, or reactivity that may pose risks to human health, ecosystems, or the environment.90.9% was identified as non-hazardous waste, generally considered less harmful and subject to lighter regulatory controls.a
Since 2023, Idemitsu Kosan's total waste generation fell by 1.34%, but rose by 9.52% in 2025, potentially reflecting a temporary surge in activity or inconsistency in waste control strategies.a
Over the same period, the share of hazardous waste in Idemitsu Kosan's total output increased by 54.39%, including a further 20.89% rise in 2025, suggesting a troubling upward shift toward more environmentally harmful waste streams that could raise compliance costs and environmental risks.a
Overall, Idemitsu Kosan had previously reduced its waste generation, but recent increases in both volume and hazardousness suggest potential reversals or emerging operational risks that warrant further investigation.a
In 2025, Idemitsu Kosan reported that 21,741 metric tonnes of its total waste output were classified as hazardous. This represents 9.1% of its overall waste generation.a
The company treated this hazardous waste using a combination of methods.A majority (98.93%) was diverted from disposal through recovery-oriented treatments such as recycling or reuse. This suggests that Idemitsu Kosan has established processes to reduce the environmental burden of its most harmful waste streams.a