This study focuses on insalubrity, its causes and manifestations in schools in Abomey. It required qualitative and quantitative data from documentation and field research in 20 secondary schools in Abomey. A total of 618 direct stakeholders (learners, teachers, administrators and shop assistants) and indirect stakeholders (managers of the hygiene and basic sanitation service, the departmental directorate for the living environment and the coordinating doctor for the Djidja - Abomey - Agbangnizoun health zone) were interviewed. Various rates, ratios and the Insalubrity Level Spatialization Index were calculated. Insalubrity in Abomey's secondary schools stems from the conditions offered by the school and the behavior of its users. The latter is characterized by the poor security of the school grounds, with 45% of schools unfenced, and a low communal coverage rate (30.32%) for toilets/urinals, suggesting strong pressure on existing facilities.