The rapid increase in population but the inability of water resources to satisfy this increase will cause the world to face a significant water crisis in the future. In this study, it was aimed to determine the factors related to the attitudes and behaviours on water use of students receiving postgraduate education in a university's institute of health sciences. The cross-sectional study was conducted between January and May 2019 with postgraduate students at Mersin University Institute of Health Sciences. The sample was not selected, and 167 out of 238 people attending the classes were reached (Participation rate: 70.1%). The questionnaire form consisted of sociodemographic questions and the Adult Water Use Questionnaire. Percentage, mean±standard deviation, minimum-maximum values were used for summarizing the data, and Student t test, ANOVA analysis of variance, and Pearson correlation test were used for data analysis. 73.1% of the participants in the study were women. The average age is 29.08±4.8. 56.4% of the participants were enrolled in a master's program and 62.0% of all were studying at the medical school. Among of the participants, 34.7% used tap water for drinking, 62.5% for cooking, 93.8% for brushing teeth, 96.4% for bathing and washing clothes. Priorities when purchasing packaged water were taste, quality and brand name. Participants scored an average of 51.8±5.4 on the water use attitude scale and 42.5±9.8 on the behaviour scale. As the age of the participants and the number of people living at home increased, their score on the behaviour scale increased. Those with children had higher scores from the behavioural scale than those who did not. It was determined that the scores that physicians got from the behavioural scale were lower than all other occupational groups. It was observed that as the score obtained from the attitude scale increased, the score obtained from the behaviour scale increased. As a result, the percentage of using tap water for drinking was lower than those who used it for cooking, brushing teeth, bathing and washing clothes. Water use behaviours should be improved in accordance with the attitudes of young people, people with a small household population, those who do not have children and physicians