This paper brings together information on the water quality functioning of Han River and some other springs of it. Recently, Han River represents a surface water supply resource of Seoul and marvelous riverine areas for restaurants as well as illegal fishing. The environment of the river therefore impacted by that discharge source of nutrient and other industrial wastes. In order to evaluate man- made and natural effects on water quality, anion variables have been analysed in water samples collected every month from four springs of Han River. In this paper, a large amount of samples from four springs were taken and analytically determined with ion chromatography and Ecotest. Measured values of ammonia, nitrate, nitrite, phosphate and COD showed that could exist a relation between the concentration ratio of chloride to sulfate (Cl/S- salt ratio) and polluted level of each sampling area. Series of test with periodically monthly river water samples have been also carried out to classify this ratio regarded as a polluting indicator at the first consideration. Further studies and statistic data are needed to verify this parameter.