Shared water resources in Israel and Palestine are often the site of political, economic, historical, legal and ethical contestation. In this, the first of two volumes on the subject, the authors look beyond the political tensions of the region, to argue for the need for shared water security and co-operative resource management. The History of Water in the Land Once Called Palestine, traces the history of water resources and security and their development from the Ottoman period until 2020, examining how the state of water security amongst Palestinians and Israelis has diverged, resulting in the current success of Israeli water security in contrast to the high water insecurity experienced by Palestinians. The authors assess water security in three parts: security of access to water resources, security of access to water services and finally, security against risks to and from water.