So, up until recently, I thought that Strontium was pretty much only common as part of radioactive fallout.
What is this crazy chernobyl run-off water I've been drinking I asked myself? Well, after a little web searching, and a c0nversation with a collegue who is part owner in a Swiss spring, it turns out that Strontium does occur in nature relatively often. Maybe this isn't news to most people, but as a fan of the old Strontium Dogs comic in my youth, it seemed interesting to me.
Mind you, the Nitrates listed directly below means that the water has been contaminated by farming fertilizer, so I think I might switch to a different brand.