H,mmm I guess a fellow can't wash water with other wash water could he.
The terminology probably got us all a bit baffled.
If you are talking some sort of sediment or rust or scale or something you can see, just run some cold water into a large glass container, let it set and see what is on the bottom.
What type of piping is in the hot / cold water lines?
Can be from the municipal system itself if they are doing maintenance and haven't completely flushed their own lines that well. That only typically lasts for a few days, unless you got a big slug of it in your own lines. Running your own water a bit to flush the lines normally cures it.
Is this clean problem all the time, exactly how do you know you have a problem?
Somehow this reminds me of that problem when your GF sezs I do not "Feel Fresh". Alway with that tone, where you better know exactly what to do and quick.