WATER QUALITY ANALYSIS IN A RIVER IN SUB WATERSHED JATIROTO EAST JAVA']JAVA, INDONESIA

One of the factories that produces produce waste is the Jatiroto Sugar Factory, which is located in Lumajang Regency, East Java Province, Indonesia. Besides being affected by industrial waste from the Jatiroto sugar factory, rivers in the sub-watershed area of the Jatiroto river, are also affected by waste from agricultural areas on either side of the river. From this, further research is needed regarding the analysis of water quality in rivers in the Jatiroto sub-watershed area. This study evaluated the water quality of the Jatiroto Sugar Factory Outlet and the Jatiroto River using chemical parameters which include Biological Oxygen Regulation No. 82 the Year 2001 class II and class III and Minister of Environment Decree No. 115 of 2003, this chemical parameter exceeds the threshold of the quality standard in the classification of water quality standard classes. This is caused by the decomposition, decomposition, or dilution of organic materials or rainwater, the presence of additional oxygen from the photosynthetic process of aquatic plants. From this research, it can be concluded that the water quality of the Jatiroto River in terms of chemical parameters (pH, BOD, COD, and DO) has decreased or has been polluted, due to waste from the Jatiroto Sugar Factory.