This report cautions against an overly rigid approach to the Sustainable Development Goals (SDGs), which it argues could limit development options for poor countries, particularly in how they are able to manage critical water resources. It identifies key challenges such as setting realistic targets, carefully considering the local context to address the needs of the poor, and promoting sustainable water resources development in a way that values healthy ecosystems. Case studies and examples are provided to give critical analyses of how national SDG targets can be defined and met through the most current evidence-based water policies.