Nader Al-Khateeb served as Chief Engineer for the Bethlehem, Beit Jala and Beit Sahour Water Authority from 1984 to 1993, where he was responsible for planning and fundraising, as well as operations and maintenance of the distribution network. After returning from leave to acquire his M.Sc. degree, he also became the Project Manager for their drainage and sewerage project. From 1994 to 1997, Mr. Al-Khateeb was a senior water resource engineer with the UNDP's Water Resources Action Program, working as a consultant in the effort to formulate and establish the Palestinian Water Authority (PWA). He then became associated with the PWA itself, coordinating a host of water and wastewater projects.