This question is obviously intended for those that live in places where tap water is “safe to drink.”
I live in Southern California, where I’m at the end of a long chain of cities. Occasionally, the tap smells of sulfur, hardness changes, or it tastes… odd. I’m curious about the perspective of people that are directly involved and their reasoning.
I am sure G! will find local water testing for you.
But, before you do that, check your municipal water web site. Mine publishes their testing results. Monthly, iirc.
Of course, this is only part of the puzzle. Your exact tap may have very different results.