What's in the water we drink?
I have spent some time working with students to sort this out in Otsego County New York. We were initially motivated by the need to establish a solid geochemical baseline before any fracking operations started in New York.
I also worked with Otsego County Conservation Association (OCCA) and Community Science Institute to characterize the level of contaminants in water wells across Otsego County. Good news on that front--In the roughly 80 wells we tested, almost all had excellent water quality. OCCA may have a copy of the report in their archives.