<![CDATA[Groundwater constitutes the source of potable water for communities in regions lacking access to piped water services, a category that includes Kubu Raya Regency, which is characterized by a peat and coastal ecosystem. The objective of this study is to analyze the suitability of groundwater as a source of clean water based on its organic matter content (KMnO₄). Samples were collected from 17 points, including dug wells (representing shallow groundwater) and bore wells (representing deep groundwater), employing the purposive sampling method. Laboratory analysis employed the permanganometry method in accordance with SNI 06-6989.22-2004. The findings indicated that the KMnO₄ content in peatlands was significantly higher than in coastal regions, with maximum concentrations exceeding 200 mg/L in dug wells in Rasau Jaya 2, Parit H. Muksin, and Kuala Dua. In coastal regions, the levels of KMnO₄ were predominantly below 50 milligrams per liter (mg/L). The analysis revealed that all samples exhibited levels of TDS that were below the permissible limit as stipulated in Permenkes No. 32 of 2017, which stipulates a maximum limit of 10 mg/L for KMnO₄. The values of KMnO₄ demonstrated a positive correlation with the intensity of water color and a negative correlation with increasing well depth. This condition is indicative of the profound impact of organic matter resulting from vegetation decomposition in peatlands and natural filtration processes in the deep soil layer. The analysis indicates that groundwater in both areas is not suitable for direct use without treatment. To ensure safe and sustainable clean water, oxidation, coagulation-flocculation, and multiple-layered filtration processes tailored to local characteristics are required.]]>
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