Water Quality of Cilutung River Sumedang Regency, West Java, Indonesia

Cilutung River is one of the sub-watersheds in the middle of the Cimanuk River which is located in Tomo District, Sumedang Regency. Cilutung River utilization is used for sand mining activities and may cause a negative impact on water resources, among others causing a decrease in water quality. The objective of this research effort is to determine the condition of water quality in the Cilutung River, Sumedang Regency in September - November 2020. The method used in this research is the survey method. The technique of determining the station was carried out by purposive sampling method and was carried out at three research stations. The sampling technique was carried out in situ and ex-situ. Parameters observed in situ consist of temperature, light transparency, DO, and pH and ex situ consist of TDS, TSS, nitrate, ammonia, and COD. The temperature value obtained is about 25℃ - 28,7℃. Light transparency value is about 17cm - 23cm. TDS value was about 197 mgL-1 - 276 mgL-1. TSS value was about 27 mgL-1 - 94 mgL-1. pH value is about 6.92 - 7.03. DO value was about 7.1 mgL-1- 7.4 mgL-1. Nitrate value was about 0.06 mgL-1- 0.64 mgL-1. Ammonia value was about 0.001 mgL-1 - 0.002 mgL-1. COD value was about 5.5 mgL-1- 9.6 mgL-1. In general, the water quality of the Cilutung River is classified as good and safe following the water quality standards class II for aquaculture from Regulation of The Government of The Republic of Indonesia No. 22 of 2021. However, the TSS value is above the class II threshold and close to the class III limit due to the sand mining in the Cilutung River.