The expansion of nickel processing in Indonesia has resulted in the generation of large quantities of nickel slag. A legal issue arose when Government Regulation No. 22 of 2021 classified nickel slag as non-hazardous and non-toxic waste (non-B3) under code N102. Questions have been raised as to whether this classification alters or eliminates the civil liability of slag producers in the event of subsequent environmental pollution or damage. This study aims to analyze the civil liability framework for nickel slag producers following this change in status and to formulate a reconstructed liability model that upholds the "polluter pays" principle and ensures environmental protection. The study employs a normative-juridical method utilizing statutory, conceptual, and comparative approaches. Legal materials were gathered from legislation, court rulings, books, journal articles, and official government and corporate documents. The findings indicate that reclassifying nickel slag as non-B3 waste cannot be interpreted as absolving producers of all civil liability. Liability reconstruction should focus on a concept that transcends waste classification, instead accounting for the potential risks associated with the production, storage, utilization, and transfer of nickel slag
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