Analysis of Water Quality and Water Quality Status of Belayan River in Kenohan Sub-District, Kutai Kartanegara District

Abstract Water quality is a crucial aspect of environmental sustainability, particularly for rivers that serve as primary sources for domestic, industrial, and agricultural activities. This study evaluates the water quality and pollution status of the Belayan River in Kenohan District, Kutai Kartanegara Regency. The study employs physical, chemical, and biological parameters to assess water quality, using the STORET method for pollution classification. The sampling locations consist of 4 stations: Station 1 (Mouth of the Belayan River), Station 2 (Muhuran Village River), Station 3 (Sebelimbing Village River), and Station 4 (Upper Belayan River in Kenohan Village). The parameters observed in this study are pH, Total Suspended Solids (TSS), Biological Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Dissolved Oxygen (DO), Nitrate, Phosphate, and Fecal Coliform. The water quality status of the Belayan River based on the STORET method is classified as moderately polluted, and using the Pollution Index, it is lightly polluted. The highest TSS pollution load is 3859.5 tons/day. This pollution is caused by various residential, agricultural, and water transportation activities that produce waste and potentially pollute the Belayan River.