"Chemicals from fracking wastewater dumped into Pennsylvania's Allegheny River before 2011 are still accumulating in the bodies of freshwater mussels downstream, according to a new study.
Researchers at Pennsylvania State University found elevated concentrations of Strontium in the shells of freshwater mussels downstream from a former fracking wastewater disposal site in Warren, Pennsylvania, about 143 miles northeast (and upstream) of Pittsburgh." ...
"We think the sediment acts like a reservoir for higher levels of radioactivity and metals, and that's where the mussels live," he added, "so this could continue to have even longer-term impacts even though that valve got turned off."
Note: much of Pittsburgh's water supply comes from the Allegheny River. One intake is near Verona.