The use of tap water has a large eco-friendly factor because it uses less water and carbon than bottled water or water purifiers, and there is no plastic waste. If this is accurately recognized, consumers will be able to recognize the use of tap water as eco-friendly consumption and promote tap water drinking. However, there must be trust in commodity quality and water management. Therefore, this study attempted to demonstrate the factors influencing the perception of environmental protection, environmental interest and practice, and the perception of tap water's usefulness and trust in tap water management. To this end, a total of 14 hypotheses were established, hypotheses were verified through structural models, and mediating effects were analyzed. The data used the results of an online survey of 358 adult consumers nationwide. As a result of the study, it was found that recognizing the environmental value of tap water mediated the recognition of the need for environmental protection and the recognition of the use of tap water as eco-friendly consumption. In addition, in the case of recognizing the usefulness of tap water and trust in tap water management, it was found that the use of tap water was recognized as eco-friendly consumption through satisfaction of tap water quality. In addition, tap water usefulness and trust variables in tap water management proved the mediating effect of recognizing tap water use as eco-friendly consumption through two variables: satisfaction with tap water quality and recognition of tap water environment value. In the end, it was confirmed that it is important to emphasize the usefulness of tap water, restore trust in the tap water management process, and emphasize the environmental value of tap water by emphasizing the need for environmental protection. Therefore, this study emphasized the direction of K water management education and the school's environmental education, suggested ways to restore trust in the water management process, and emphasized the importance of tap water management as an eco-friendly consumer behavior in the water industry and water management area.