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Decreasing the volume of raw water sources results in an imbalance between clean water needs and raw water supply. Therefore good water management. One of them is the use of rainwater through rainwater harvesting activities. The Banyu Bening Rainwater Community in Yogyakarta is one of the voluntary associations that has successfully implemented water management by harvesting rainwater through sustainable use of house roofs. This community spreads sustainable rainwater harvesting techniques to various locations in Indonesia by utilizing the dominant information they have. Dominant information is one of the sources of strength and is information that is difficult or cannot be verified, according to the actor-centered power theory (Actor-Center-Power). This study aims to analyze the factors that influence community decision-making to participate in rainwater harvesting activities, find out the sources of information that form the basis of decision making, and find out the influence of the dominant information in community decision-making. The researcher used a qualitative approach to the type of research in a case to obtain a picture of the dominant information strength in the spread of the rainwater harvesting movement. Data is collected by triangulation / combination (indirect structured interviews) with respondents of rainwater harvesting plant owners. The results of the study show that community decision-making to be involved in rainwater harvesting activities is influenced by (1) promotion of rainwater harvesting activities as an alternative to overcome water scarcity, (2) material or content of rainwater harvesting promotion delivered by the Banyu Bening Community, and (3) the main reasons people participate in rainwater harvesting activities. Sources of information that form the basis of community decisions from circulating oral information, direct promotion or socialization activities, print media (leaflets), and social media. The influence of dominant information in making decisions regarding community participation has made people interested in using and participating.

water management, rainwater harvesting, dominant information