The last few times I have hooked up to city water in a RV park I have found the first basin of water I run into the back bedroom sink is green, almost the color of transmission fluid. It only seems to...
Unused city water for a long time, sitting in copper pipes will do this. I wouldn't worry about anything wrong in your MH, but the next time you hook up to city or rv park water let the water run for a bit before you hook up.