Chesapeake Energy Corp., whose gas well blew out during hydraulic fracturing last month in northeastern Pennsylvania, hasn't publicly disclosed chemicals that spilled, setting up the first test of an industry-backed voluntary disclosure program.

An official in charge of the disclosure registry said the chemicals should be disclosed in such a situation.
"You'd have to treat it like one that was completed," Mike Paque, executive director of the Ground Water Protection Council (GWPC), said in an interview. "The chemicals were down the hole."
Chesapeake has led the drive within the industry for disclosure and was among the first to join the FracFocus registry initiative. But company spokesman Jim Gipson said the company doesn't plan to file a report until it is done with "completion," the preparation of production after drilling.