I heard an interesting report on our local newzradio (DC's WTOP). They did a survey of some local restaurants and fast food joints. They took samples of water from the toilet bowl in the public restrooms and a sample of ice.
The toilet water was essentially pure and germ-free. The ice, when melted ..... not so much. Every ice sample had at least a trace of e coli. None of the ice was so bad as to cause illness in anyone, but the e coli was there.
Interesting, huh?
This doesn't surprise me at all. The toilets fill from fresh, pure municipal water and the flushers do a good job of ... well ... flushing. But icemakers and bins require human intervention to make them clean. The worst is the very bottom of the ice bin. Unless the bin is emptied, the ice down there has been around since the Mesosoic Era. Even though it is ice and cold, bugs can still grow. The water gives them the sustenance they need.
Ice, anyone?