International service learning (ISL) programs seek to facilitate community inclusion, but such participation can prove elusive. For technical projects, such ventures can undermine local leadership, generate mistrust in communities, and even create an aversion to technological solutions. In this article, we document how social work and engineering students collaborated to bring clean water to rural Guatemala, and demonstrate how we employed social work principles to address the myriad issues encountered in the project. We contend that the inclusion of a social work perspective, with its emphasis on relationships, can help mitigate some of the challenges ISL projects tend to encounter.