I once lived somewhere where the tap water was undrinkable. Ironically on the side of a fucking mountain so you’d think it would be good water.

Apparently that particularly area has naturally high levels of arsenic in the water and higher than normal cancer rates especially stomach cancer. And I lived in a small town on the edge of a national forest so it wasn’t industry polluting water, it was naturally polluted water if you can believe that.

Now where I live, 20 mins away, the spring water is so good you could bottle it.

Both places are untreated well water - the current spot the well draws from the spring.