Abstract
Recently increased number of elementary school pupils brings drinks from home for their hydration at school and this phenomenon indicates the change of the role of water supply at schools. In order to investigate the potential causes and the structure of the problem, an online survey targeting mothers of grade-schoolers was carried out, taking account of psychological factors of mothers as well as their decision making process. In the questionnaire preparation, latent variables and observable variables were assumed. The identified results include: difference exists on people's choice of drinking water; more parents in western Japan wish pupils bring drinks and some parents in eastern Japan wish the same. Covariance structure analysis identified a causalmodel; in which parents' frustration to schools associated with decreased reliability to tap water cause parents' advice to pupils take drink from home. Policy makers are expected to make the most of the result of analysis.