The study looked at water quality in the upper stream of Dongjin River to understand changes and help protect water quality. Water samples were collected from 9 sites over 8 months in 2002. Results showed varying water temperature, pH, and COD levels. Livestock waste and sewage had a bigger impact on T-N and T-P levels than agricultural activities. SS, DO, and BOD levels also varied. Cations like Na, Ca, K, and Mg were present in different amounts, with SAR below 2. Heavy metals like Zn, Cu, and Pb were found, but Cd was not detected. Overall, water quality in the area was more affected by livestock waste and sewage than by agriculture.