As a matter of fact, I've been measuring strontium in ground water all over the country for a few years. I'm sort of surprised by how much there is in some places... but they tend to be pretty red-neck sorta places. I'm not really sure, but at first glance, most of the highest concentrations seem to sort of map along the shorelines of the mid-cretaceous sea-way. Think a line between wisconsin and texas. Flyover country.
Anyway, where it occurs, there's almost always such a shitload of calcium and magnesium that a) you can't drink it and b) the strontium wouldn't make any difference. (i.e. it acts in the body by displacing calcium, but can't in reality because there's too much calcium to compete in any reaction.)
Anyway, haven't sensed any friendly vibes from the people who sent in those samples