The Trump administration's rollback exempts some coal-fired power plants from Obama-era rules for wastewater containing toxins like mercury, arsenic and selenium.
AG Shapiro filed 15 criminal charges, including nine felonies, after more than a decade since Cabot's fracking activities caused well water contamination.
New York and New Jersey have used a provision of the Clean Water Act to halt pipeline projects carrying shale gas from Pennsylvania across state lines.
The brain-harming metal is discharged directly into the river or carried to it on air currents. Some argue authorities are doing too little to stop both routes of pollution.
