EPA sued over fracking waste-disposal rules amid worry over earthquakes

Environmental groups sued the Environmental Protection Agency on Wednesday to force new regulations on the disposal of waste generated by hydraulic fracturing.

The injection of hundreds of millions of gallons of wastewater from fracking into underground wells has been linked to numerous earthquakes in Kansas and several other states.

The suit calls for the EPA to update waste disposal rules that are decades old and precede the recent oil and gas boom made possible by fracking and horizontal drilling techniques.