Environmental problems caused by gold mining activities persist in Nagari Padang Matinggi, Rao Subdistrict, Pasaman Regency. Field observations indicate that mining activities continue along the river, with waste materials consisting of mud, sand, and excavation residues being discharged into areas surrounding the river. These conditions are reflected in the river water becoming increasingly turbid and brown, as well as the accumulation of sand and mud that causes river sedimentation. Residents have also reported that the river water, which was previously used for daily needs, has experienced a decline in quality and may cause health complaints, such as itching after use. These conditions indicate problems in environmental management and supervision at the local level. This study aims to examine the implementation of Pasaman Regent Regulation Number 7 of 2022, Article 20 Paragraph (3), concerning the duties and functions of the Environmental Affairs Division in Nagari Padang Matinggi and to analyze its implementation from the perspective of Fiqh Siyasah Tanfidziyah. This study employs a qualitative approach with a field research design. Data were collected through observation, interviews, and documentation and analyzed through data reduction, data presentation, and conclusion drawing. The findings indicate that the regulation has not been implemented optimally, as evidenced by the continued river pollution and sedimentation, as well as inadequate environmental supervision. From the perspective of Fiqh Siyasah Tanfidziyah, these conditions indicate that the principles of trustworthiness (amanah), justice, compliance with regulations, and public welfare (maslahah) have not been fully realized in the implementation of environmental management.