"Environmental regulators on Thursday directed six natural gas drillers to disclose how they dispose of or recycle waste water in Pennsylvania after a recent Chesapeake Energy Corp accident.

A regional office of the Environmental Protection Agency asked Chesapeake, Chevron-owned Atlas Resources, Talisman Energy USA, Range Resources, Cabot Gas and Oil Corp, and SWEPI, LP for the information.

The companies did not immediately respond to questions about the EPA request.

The request also follows recent reports that said waste water resulting from hydraulic fracturing, or fracking, can contain radioactive particles."
 
Timothy Gardner and Edward McAllister report for Reuters May 13, 2011. [2]