With the present growing water stress, conflicts can rise between sustainability efforts and meeting the water needs of populations. Both developing and developed countries are struggling with finding sustainable solutions to provide access to water for everyone, especially vulnerable groups. The further development of the human right to water may provide for a legal solution when subjecting this right to sustainability requirements. The focus of this study is to further develop the human right to water in such a manner that it will encompass the sustainable enjoyment of the right by vulnerable groups. To explore the topic, classic legal methods are adopted through desk research. Also an assessment framework will be developed and used in case studies. Meaning that with the use of qualitative research methods such as interviews, the interaction between the concepts (vulnerability, sustainability and the human right to water) will be examined. This will shine light on the requirements needed for the sustainable enjoyment of the human right to water by vulnerable groups.