I have town water supply. Home was built in '52. I noticed something a few weeks ago where my water started to taste funny. Bitter and cottonmouth. I have noticed some browning every so often when I do something to the line. I once cut the pressure at the main to fit a sink. Let the house supply drain and when I filled it back up the water has some brown spots. (Continues do flush). I then just replaced my 3/4 in original copper in the basement with new 3/4 in to route around the perimeter of my unfinished basement. This was done for cosmetic reasons. When I cut the old pipe I ran my finger in it and it was like a brown slur.
Not sure if all the original pipes have this. Is this normal for pipes of this many years? I plan to have my water tested anyway. Just interested in hearing some experiences.