This mystery was solved: Scientists say chemicals from fracking wastewater can taint fresh water nearby – “…But a study by the U.S. Geological Survey appears to have answered a critical question about the millions of gallons of chemical-laced water that are injected into the wells to fracture rocks and release trapped gas. Is there any cause for concern when that water is stored later, whether in treatment facilities or special underground wells? The short answer is yes…”