Final answer:
In an establishment inspection, the presence of soap at a hand washing sink is classified as a Priority Foundation item, which is fundamental for supporting hand hygiene and, consequently, public health.
Step-by-step explanation:
Having soap at a hand washing sink is designated as a Priority Foundation item when inspecting an establishment. The risk designations during health inspections are categorized to reflect the level of risk to public health. A Priority Foundation item, as defined by the Food and Drug Administration (FDA), includes the provisions that support or enable a priority item. They are essential to implement and maintain and, although they do not directly eliminate or prevent a hazard, failure to have soap at hand washing stations could lead to serious adverse health consequences or death, as it is crucial for the proper sanitation of hands.