Spring water is a crapshoot, sometimes it's fine, sometimes it's not. It can run the gamut from high PH to low PH, from high dissolved solids to low dissolved solids. I have an artesian spring across the street from my house, it's actually better than the water company water, EXCEPT, it has high Manganese, Magnesium, and Boron concentrations. There's also the possibility of Arsenic, Lead, Asbestos, as well as other heavy metals in spring water, depending on the parent rock it passes through. Always best to have it tested.