A group of Duke University scientists have found concentrations of radium, a highly radioactive substance, in a stream near a facility that treats wastewater left over from hydraulic fracturing. The concentrations are 200 times higher than background levels — and they're in the water supply.
Fracking is the practice of pumping chemical-laced liquids underground at high pressure to help bring gasses, like methane, to the surface for extraction. But these chemicals are known to seep into groundwater. And the high-pressure may be causing earthquakes.