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Elevated concentrations of strontium, an element associated with oil and gas waste waters, have accumulated in the shells of freshwater mussels downstream from wastewater disposal sites, according to researchers from Penn State and Union College. With concern growing that the underlying geology in the Permian Basin is reaching capacity for disposal wells, the Trump administration is examining whether to adjust decades-old federal clean-water regulations to allow drillers to discharge waste water directly into rivers and streams.