9 J-PAL, Vol. 10, No. 1, 2019 ISSN: 2087-3522 DOI: 10.21776/ub.jpal.2019.010.01.02 E-ISSN: 2338-1671 Water Quality Analysis on Tertiary Channels Using Macroinvertebrate In Songka Sub-District, Palopo City Abdul Rais 1 , Aminudin Afandhi 2 , Budi Prasetya 3 1 Post Graduate School of Environmental and Development, Graduate Program, Brawijaya University, Malang, Indonesia 2 Pest and Plant Disease Departement, Faculty of Agriculture, Brawijaya University, Malang, Indonesia 3 Agriculture Department, Faculty of Agriculture, Brawijaya University, Malang, Indonesia Abstract Changes in the condition of aquatic environment are now a major problem for the survival of every organism caused by changes in land use, human activities, and agriculture. This study aims to determine the structure of macroinvertebrate communities. In addition, this study also aims to conduct analysis on BMWP index and water quality testing using physical and chemical parameters. This study was conducted on tertiary channels in Songka Sub-District, Palopo City. Each station's data collection covered relative density, macroinvertebrates that were found were assessed using BMWP index, then they were calculated using ASPT index. The results of this study found 17 taxa classified in the class of gastropods, insecta, bivalvia, malacostraca, citellata, oligochaeta and hirudenia. The results of BMWP index modification analysis from all stations found that ASPT value was “quite-poor” and “bad”. It was indicated that in each station was mainly dominated by Oligochaeta worms and tolerant macroinvertebrates. Testing of physical and chemical parameters obtained DO value which belonged to class II of water quality. The low DO value caused high BOD value, which was classified in class III. The high value of BOD had an effect on the rise of COD value, the increase of COD value was caused by the high amount of organic and inorganic materials entering the water. PH value was relatively normal with the range of 6.3 to 6.8, temperature was in the range of 27.1°C to 28°C, the rise in temperature value was influenced by tree shade and the intensity of sunlight. Keywords: BMWP-ASPT, Community structure, Macroinvertebrate, Pollution, Tertiary channel, INTRODUCTION  Water is one of the natural resources needed by living creatures. A water quality expert from the University of Birmingham believes that water is a very important natural resource in the world. If there was no water, then life would never exist and most industries would not operate [1]. [2] Government Regulation (PP) No. 121 Year 2015 on the Utilization of Water Resources explains that water is all water contained above or below the soil surface, including sea water on land. Good water quality will dictate wider use, since water quality is the quality of water that meets the standards for a predetermined purpose [3]. Water quality determines the viability of water biota and human that directly utilize the water. The utilization include: for bathing, washing and defecation, and for the disposal of livestock waste, agricultural waste, and household waste. All of those activities can cause water pollution that can affect Correspondence address: Abdul Rais Email : abdulrais021@gmail.com Address : Graduate Program of Environmental Resources Management and Development, Brawijaya University water quality status. [4] Water contamination is the inclusion of organic or inorganic materials or other components into water so that it can affect the decrease of water quality. Changes in aquatic ecosystems caused by the expansion of agricultural land and the increase in irregular human activity have caused great concern about the availability and quality of water sources [5]. In this way, the ecological integrity of rivers has been a problem of water quality degradation to human interests worldwide. Good and bad water conditions were influenced by surrounding activities [6]. [7] Existing activities can degrade water quality, then it will disrupt the survival of water biota. The more to the downstream, the quality of water decreases due to the pollution of organic matter from human activities [8]. Many ways are used to monitor water quality, either chemically, physically, or biologically [9]. The tertiary channel is a channel of irrigation channeled from the primary and secondary channels. There are water macroinvertebrates living in this channel. The tertiary channels in Palopo City have partially been using pelengsengan, so that it can affect the life cycle. Benthic macroinvertebrates are basically aquatic organisms that are relatively difficult to migrate and have high sensitivity due to