This study aims to measure the changes in the water literacy of the subjects (N = 620) aged over 18 before and after participating in the water-saving activities. The results showed that there is a significant improvement in the water literacy of the subjects after the water-saving activities but with a medium-small effect size; there is no significant correlation between water knowledge and water attitude before or after the activities. In addition, there is a significant difference in water literacy regarding subjects' background variables, such as age, income, and household water expenses. In other words, the attitude and behavior related to the use of water could be easily influenced by different background variables. Due to the limitation of the museum being the study field, the post-tests were given immediately following the activities, therefore the improvements of the subjects' knowledge and attitudes may not be retained over time. The findings can serve as a reference for the Water Resources Department to promote water conservation education in the future.