In the Swedish Act for higher education, as well as in the policies of technical universities, it is stated that sustainable development (SD) should be integrated into engineering education. Researchers argue that SD needs to be integrated into the overall course content rather than added as a specific course. In this paper, six engineering lecturers have been interviewed to give their views on how SD can be integrated into teaching water and sanitation engineers. Engineering lecturers seem unsure how to interpret SD in relation to their own specific courses. Students are said to request technical knowledge rather than fuzzy ideas of SD and lecturers struggle to open up the teaching to more problem-based perspectives. Sanitary professionals in work practice relate to SD as a core in water treatment processes and regret that responsibility for SD issues fall between traditional departmental structures in society.