What is that white stuff on the wall mounted drinking water fountain?

Question

I always drink water from the wall mounted drinking water fountain at work. There is some white stuff on the nozzle of the water fountain. Is it harmful? Does anyone know what it could be?

The water does not come out uniformly. Part of the water touches the inner part of the nozzle.

Answer 1

minerals, your drinking it

Answer 2

just mineral build up from the water.

Answer 3

Ew, maybe it's mold or something. Someone could of put their mouth on the nozzle and drank from it. IDK what it is though.

Answer 4

It seems like the water have high amount of calcium but will not harm you. Its a good idea to use water reservoir before comes out in order that calcium will settle at the bottom and reduce it to deposit at discharge points.