The purpose of the study is to evaluate the water quality in the Daecheong Lake basin. This evaluation calculates indicators through preliminary studies, and for the analysis of results according to each indicator, statistical analysis was conducted through SPSS after collecting basic data over the past 10 years. For basic water and social service data, the basin area of tributary rivers was calculated by dividing the area where the GIS is located. Based on the basic data, the normality of distorted data was secured and standardized, and the final index was calculated through a suitability review after factor analysis using the SPSS program. For the calculated indicators, the weights suitable for the study were calculated and compared, the final weights were selected and the index calculation and scoring were conducted. Finally, the evaluation methodology of water social service and the evaluation results for the realization of water welfare were presented. The evaluation of water social services through this study will help minimize the negative impact on the preservation and development of river values by continuously monitoring changes in the river environment.