As a natural consequence of the study of seismic risk carried out on the infrastructure of the Costa Rican Institute of Aqueducts and Sewers (AyA) within the Greater Metropolitan Area of San José, specific studies have been planned to analyze specific system components that have scored very high risk values. As water reservoirs are included among these components, this Technical Note aims to pull together the most important aspects to be considered within the necessary structural analyses performed within a formal vulnerability study.