I have something to say about this. I've tasted the water in Boston, MA. I mean, I rarely will comment on the water when I visit a city ... but the tap water in Boston is SWEET and YUMMY and surprisingly noteworthy! I am serious! I never thought I could say that any place tap water that rivals Hilo but I have to say that it certainly deserves that title! Boston deserves a special trip just to see if I'm right. I think you will be pleasantly surprised.
But then, they only test water from 12 cities ... and if they tested the water in Hilo, I think they'd be pleasantly surprised too!