What must be the location of the nozzle in a drinking fountain relative to the fountain?

The nozzle of a drinking fountain must be located above the flood level rim. This positioning is crucial for preventing contamination. By placing the nozzle at this height, the potential for backflow of water into the fountain from the nozzle is minimized.

This arrangement ensures that any water flowing from the nozzle into the fountain is directed downwards, reducing the risk of splashing water contaminating the drinking source. Furthermore, maintaining the nozzle's height above the flood level rim allows the area around the fountain to remain safe and sanitary, promoting hygiene and public health.

In contrast, positioning the nozzle below the flood level rim would increase the risk of contamination. It could create situations where water could flow back into the system, leading to possible health hazards. Similarly, placing the nozzle at the bottom or top of the fountain does not conform with safety and health standards established for drinking water equipment, which prioritize accessibility and cleanliness.