Cimahi River is one of the sub-watersheds of the Citarum River. The upstream of the Cimahi River is located in the West Bandung Regency area through 7 villages namely Karyawangi, Cihanjuang, Cihanjuang Rahayu, Sukajaya, Padaasih, Jambudipa, and Kertawangi. The research was carried out at 3 points, namely monitoring point 1 at coordinates E 107°34‘41.01” S 06°47‘51.29”, point 2 at coordinates E 107°34‘24.36” S 06°48‘54.09”, and point 3 at coordinates E 107°33‘58.28” S06°50’ 05.33”. The purpose of this study is to determine the status of the water quality of the Cimahi River so that the level of water pollution that occurs can be known. The method used to calculate the status of water quality is the Pollutant Index which refers to the Decree of the State Minister of the Environment Number 115 of 2003 concerning Guidelines for the Status of Water Quality. Based on the research results, there are 6 main parameters that cause water pollution, namely TSS, BOD5, COD, Nitrite, Free Chlorine, and Total Detergent. The Pollutant Index results obtained in the Upper Cimahi River are categorized as heavily polluted with a significant increase from point 1 to 3, respectively 13.38 at point 1, 14.99 at point 2, and 15.36 at point 3. Source potential pollutants in this river are the domestic sector, agriculture, and livestock.