When can a drinking fountain be installed with an indirect waste?

A drinking fountain is considered a fixture that supplies potable water for drinking purposes, and it must be directly connected to the plumbing system in a manner that prevents contamination. An indirect waste system is typically used for fixtures where some level of contamination is possible and where the water must not backflow to the potable source.

The direct connection ensures that any waste, whether it be water from the fountain or other possible contaminants, does not pose a risk to the public health. Establishing a direct waste allows for proper drainage and helps maintain the safety and cleanliness of the drinking water supply.

While specific codes and regulations can vary by region, generally, the installation of a drinking fountain with an indirect waste is not permissible, reinforcing why the answer is that it should not be implemented under any circumstances.