...Maybe this will help: I called our City of Columbia Water Department, and an engineer gave some info:
Copper 3.9 parts per billion
manganese 3.4 " " "
iron 11.6 " " "
sodium 8.92 ppm
potassium 2.38 ppm
magnesium 1.85 ppm
aluminum 0.11 ppm
He had more numbers, but does this confirm that it is metals? If yes, must we take action TODAY to keep from staining? or will tomorrow we okay?

Thanks again for all the help.