Endang Yuli Herawati, Ekwan Nofa Wiratno, Pratama Diffi Samuel, Chandika Lestariaji, Rahmi Valina, Akhsan Fikrillah Paricahya, Misbakhul Munir, Ruly Isfatul Khasanah
High levels of anthropogenic activity along river basins are a major cause of declining water quality. The Welang, Gembong, and Rejoso are three large rivers in East Java, Indonesia, located in industrial and densely populated areas, and are currently experiencing pollution and water quality degradation. This study aimed to assess water quality and to determine the pollution status of these rivers. A descriptive survey method was employed from August to October 2024, and pollution levels were evaluated using the STORET method. The results showed that water quality parameters during the study period were as follows: temperature 28.1– 30.5°C, current velocity 0.10– 0.43m/ s, TSS 125– 137.5mg/ L, DO 4.88– 5.98mg/ L, pH 7.05–7.35, nitrate 0.151– 0.215mg/ L, orthophosphate 0.115– 0.237mg/ L, COD 29.33– 53.15mg/ L, TOM 15.8– 25.8mg/ L, and Pb 0.46–1.44 mg/L. Several parameters—TSS, orthophosphate, COD, TOM, and Pb—exceeded the Class III water quality standards established in Government Regulation Number 22 of 2021. Based on the STORET method, pollution levels in the Welang, Gembong, and Rejoso Rivers were categorized as severe, with scores of –43, –43, and –35, respectively. Thus, the pollution status of all three rivers is classified as severely polluted. These findings highlight the urgent need for waste management strategies to reduce pollution from anthropogenic activities surrounding the Welang, Gembong, and Rejoso River Basins. © 2025, Egyptian Society for the Development of Fisheries and Human Health. All rights reserved.
Faculty of Fisheries and Marine Sciences, Universitas Brawijaya, Jl. Veteran, East Java, Malang, 65145, Indonesia; Polytechnic of Marine and Fisheries Sorong, Southwest Papua, Indonesia; Aquaculture Study Program, Bangka Belitung University, Bangka, 33172, Indonesia; Departement of Biology, Faculty of Mathematics and Natural Sciences, Brawijaya University, Malang, Indonesia; Marine Science Program, Faculty of Science and Technology, State Islamic University of Sunan Ampel, East Java, Surabaya, Indonesia
