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The Central Java Province has many river watershed that are not known water quality, water class and its function. Babon Watershed is one of watershed where located at north slope of Ungaran Mounth. Babon Watershed consist of three rivers basin, i.e. Gung (8,372 Ha ), Pengkol (7,009 Ha), and Babon downstream (9,202 Ha). The main river is about 33,76 km length. Base on its function, from upstream to downstream of Babon Watershed can be divided into 8 segments. The research aims to measure water quality and water class, to know each function and to predict its pollutant load capacity. Data collecting method use sampling for each segment. Meanwhile, the parameters measured are Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Total Suspended Solids (TSS), Dissolved Oxygen (DO), Natrium (Na), dan Phosphat (PO4). There are 17 sampling locations that consist of 9 location points in the main river, 5 points in the tributary, and 3 points random withdrawal. Data analysis was carried out based on Government Regulation No.82 of 2001. According to the analysis results obtained that in segment number I, II, III of Babon Watershed is recommended to function in class II, while segments number IV, V, VI, VII, VIII are recommended to function in class III, for 2.17 m3/s flow-rate can be COD 50 mg/l.