| Summary: | Rivers, particularly in national parks like Taman Negara Pahang, play an important role in sustaining aquatic life forms, besides the livelihood of the locals. In conserving the area, particularly in observing the tributary locality effects unto upstream and downstream of the Tembeling River, water quality study has been carried out in two tributaries, namely, Sat and Tahan. Sampling was conducted at eight sampling locations for each river, and the parameters analysed were temperature, pH, Total Suspended Solids (TSS), Dissolved Oxygen (DO), Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), and ammoniacal nitrogen (AN). Results were then used in calculating the rivers’ WQI-DOE water quality indices. In comparison, through the WQI-DOE indexing, overall, the Tahan River scored slightly lower than the Sat River by obtaining the water quality of Class II, while the Sat River was of Class I. The one-way Analysis of Variance (ANOVA) with a confidence level of 95% showed that all water quality parameters measured exhibited no significant differences between the sampling stations locality. Thus, indicating that the locality of the rivers does not interfere with the water quality readings obtained. © 2022 Malaysian Institute of Chemistry. All rights reserved.
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