This study examines whether Korean adults have adequate water intake, and then how the adequate water intake is associated with aiming the goal for weight control based on the data of the Korea National Health and Nutrition Examination Survey (KNHANES) for 2019 - 2020. A total of 8,957 adults aged over 19 years participated in this study in consideration of demographic variables, health status, health behavior, and nutritional intake variables. A chi-square test was conducted to compare the differences in distribution of dependent variables according to independent variables, a logistic regression analysis including covariate was performed to analyze the relationships between the adequate water intake status and the achievement for aiming weight control, also a stratified analysis was used to determine the relationships between the adequate water intake status and the achievement for aiming weight control according to control variables. The results of above analyses are as follows. Only a little over half of Korean adults only have adequate water intake, the adequate water intake is associated with the aiming weight control, furthermore the adequate water intake from people being obesity or high physical activity is strongly associated with the aiming weight control. Thus, these results suggest it needs to encourage the water intake and this can be a strategy for the weight management.