This study aims to analyze the enforcement of environmental criminal law and the legal responsibility of perpetrators based on the analysis of an environmental crime case. This study employs a normative juridical research method using statutory and case approaches. The primary legal sources consist of Law Number 32 of 2009 concerning Environmental Protection and Management, Government Regulation Number 101 of 2014 concerning Management of Hazardous and Toxic Waste, and the Decision of the Sidoarjo District Court Number 673/Pid.Sus/2015/PN SDA. The legal materials were analyzed qualitatively through legal interpretation to examine the fulfillment of criminal elements, judicial considerations, and forms of legal responsibility imposed on the perpetrators. The findings indicate that environmental criminal law enforcement is implemented through criminal proceedings based on violations of hazardous and toxic waste management obligations. The court found that the defendant, as the owner of UD Mulya, was legally responsible for producing hazardous waste without proper management procedures. The study also reveals that effective environmental law enforcement requires not only criminal sanctions but also strengthened responsibility mechanisms and public legal awareness to support sustainable environmental protection.
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