<![CDATA[This study examines the quality and management of clean water in Renzo Edupark, Cibadak, Sukabumi, a reclaimed area of a former silica sand mining site. Water samples were collected from three points the main reservoir, the final reservoir, and a dug well for analysis using parameters of TDS, TSS, pH, BOD, COD, DO, ammonia, Mn, Zn, and Pb, in accordance with Government Regulation of the Republic of Indonesia No. 22 of 2021. Laboratory test results indicated that five parameters pH, BOD, COD, Mn, and Zn did not meet the quality standards, with low pH (4–5) indicating acidic conditions, high BOD and COD values, and Mn and Zn concentrations exceeding the threshold limits. These conditions have led to fish mortality and declining water quality. Several improvement methods were proposed, including neutralization using NaOH or quicklime, as well as biological and chemical treatments. The coagulation flocculation method was found to be the most effective, reducing COD by up to 79% and increasing pH to 8.5 with specific doses of chlorinated lime, quicklime, and alum. This study recommends the application of coagulation–flocculation as a practical and economical solution for revitalizing water quality in the area.]]>
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