How funny, I was born in Scituate Mass. & moved to Chicago in “72 … my dad like u always called Massachusetts taxachusetts…
Anyway, ph test samples here turn water “purple” off the charts.
I’ve made several friends wives aware of this for watering house plants, & now they go thru extra pain in the ass of properly ph water & wow my plants actually grow…they say, yep we are living on limestone here in MO.
My water comes from a spring out back that flows directly out of a small limestone cave.
My water is always at 7.
I just kind of assumed that any water flowing through limestone would naturally have a neutral ph, because, well, it’s lime.