This report introduces water-related data for solving different types of water security problems, considerations for data collection initiatives and an overview of the data value chain. It also discusses why data is critical for water security, what data should be collected and how. Finally, global water data repositories are listed to help trigger the search for relevant data and a template for a data management plan is provided as well as examples of data collection done by SWP for water allocation planning. With these resources, stakeholders should be able to better understand how to successfully utilize data to help solve their water security issues.