and Santa Rosa. 19 of the 43 districts of Metropolitan Lima (44.18%) presented some data on OPES, with an average of 65.32%. A positive correlation was observed between the percentage of housing sanitation and the percentage of private IE in relation to the total number of educational institutions per district. The density of schoolchildren per square kilometer was positively related to the percentage of dwellings with water supply, the percentage with toilets connected to the sewerage service, and the percentage of sanitation of the dwelling. The percentage of private IE in relation to the total number of educational institutions per district was positively associated with the percentage of households with water supply and connection to 2 the public drain network, and with the density of students per Km. The OPES in each district was not significantly associated with the variables of sanitation and EI. The possible factors that would explain the absence of relationship of the OPES with the sanitation are analyzed.