Final answer:
A major non-plumbing requirement for a hand-washing sink is proper hand hygiene.
Step-by-step explanation:
A major non-plumbing requirement for a hand-washing sink is proper hand hygiene.
While plumbing requirements focus on the design, installation, and maintenance of the sink itself, hand hygiene refers to the practices and behaviors of individuals using the sink.
This includes washing hands thoroughly with soap and water for at least 20 seconds, using proper hand drying methods, and following hand hygiene guidelines to prevent the spread of germs and diseases.