Water is called "the universal solvent" and for good reason - just about everything dissolves in it. In fact, the water you drink, whether from the tap or a bottle, often has minerals added to it, as pure distilled water is pretty tasteless and suitable only for your car battery and steam iron.
We have "hard water" here on the island, but it isn't really much harder than water in other places in the country. In fact, hard water is pretty much the norm. You may recall the fiasco in Flint, Michigan (well, the latest fiasco - Flint has a recent history of them) where they decided to switch water supplies. The new water had less minerals in it, and it dissolved the coating on the old lead pipes that had built up for decade after decade, and as a result, the lead was exposed and dissolved in the water, poisoning the population. Water is a tricky thing.
I grew up with really hard water. We lived by the lake, but had a well, and the water was full of iron. It turned the toilets brown in about a month and we had a potassium permanganate water "softener" system that was a royal pain-in-the-ass to maintain, as it required "backwashing" frequently and adding more of this purple potassium permanganate crystals into it - often turning the water purple for a while. It never worked quite right - the water always smelled like sulfur and left iron stains everywhere.