Physical Science International Journal

This study aimed to assess the physicochemical water quality of the Sabangan River in Barangay Can-ayan, Malaybalay City, Bukidnon. Specifically, it evaluated total dissolved solids (TDS), turbidity, dissolved oxygen (DO), pH, and total alkalinity in upstream, midstream, and downstream sections of the river to determine compliance with the Department of Environment and Natural Resources (DENR) Class C standards for recreational waters. This study employed a qualitative descriptive research design to characterize the physicochemical properties of the river water based on observed and measured parameters. Water samples were collected and analyzed ex-situ at F.A.S.T. Laboratories to determine key physicochemical parameters using standard laboratory methods. pH was assessed using the 4500 H+B electrometric method, turbidity was measured through 2130 B Nephelometry, TDS was determined via 2540 C Gravimetry, DO was analyzed using the 4500 oC Azide modification method, and total alkalinity was tested through 2320 B Titrimetry. The analysis revealed that TDS was 146.67 mg/L, turbidity was 0.413 NTU, DO was 8.47 mg/L, pH was 8.26, and total alkalinity was 112.00 mg/L. All measured parameters were within the DENR Class C standards for recreational waters, i.ndicating low levels of dissolved impurities, high water clarity, and a well-buffered aquatic system. The findings suggest that the Sabangan River maintains good water quality for recreational use. However, continuous monitoring is recommended to prevent potential contamination from tourism and local activities. Future research should examine additional water quality indicators such as biochemical oxygen demand (BOD), fecal coliform levels, nutrient concentrations, and heavy metal contamination to provide a more comprehensive assessment of the river's ecological health.