ASPT(Average Score per Taxon) is an index used to evaluate water quality. By dividing the BMWP Score by the coefficient, this study shows that the ASPT value of Prussia River is between 7. At 7: 24, the water quality of prabhu River is classified as medium water quality, which is consistent with the research work of national signal (2559) with insects as the water quality index. In the tributary of Guaida River, the value with insects as the water quality index is greater than 7, indicating that the water quality of prabhu River comes from bile water quality (Utah et al., 2558) and the dissolved oxygen content (DO) of chemical water quality factor is within the range of 3. The biochemical oxygen demand (BOD) of 08 to 335 mg/L is in the range of 2. 36 to 272 mg/L, in which the water quality is considered to be lower than the standard value of Class II surface water source, but the acidity, alkalinity and ammonia nitrogen value are within the standard value of Class II surface water source (Pollution Control Department, 2535). The values of nitrite, nitrogen and orthophosphate are within the standard values of natural water sources (Table 4).
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