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.
Just remember to keep facts and figures as the most important thing when discerning the truth. Family may be trustworthy, they may be smart, but that doesn’t mean they’re experts in fields. You don’t need to feel bad for trusting your brother, but know their limitations too.