The problem of contamination at water supply resources is well environmental recognized. Besides, the issue of drinking water quality has risen as community consideration. With the role of main source of water supply, Han river are playing an important role not only in daily life of Seoul habitants but also industrial and agricultural activities of city. Therefore, the needs of monitor and evaluate water quality have been paid attention so far. Samples were collected monthly started through March to the end of June, from branches in Han river. Different testing methods were applied in order to classify water quality in the lab in that, simultaneous determination of environmentally interesting inorganic anions is carried out by suppressed ion chromatography. The results of sampling site after Paldang (AP), the area drinking water is up taken, performed in presence of anions that commonly occur in real samples (Cl-, NO3-, SO4-2). In this research, the concentration of chloride and sulfate amount in surface water was regarded to be relative with the municipal wastewater effluent and pollution level. In the same way, COD measured with the test kit is to primarily evaluate the quality of water. Data showed the fluctuation in anion amount through months, but reached the highest values in May and lower by the end of the spring quarter. The study is being continued in the next period to keep a view on Han river quality.