Chesapeake Energy Corp,the Oklahoma-based firm is the No. 1 driller in Ohio.
Rig Count Interactive Map by Baker Hughes, an energy services company.
Shale Sheet Fracking, a Youngstown Vindicator blog.
The Ohio Environmental Council, a statewide eco-group based in Columbus.
Earthjustice, a national eco-group.
People's Oil and Gas Collaborative-Ohio, a grass-roots group in Northeast Ohio.
Concerned Citizens of Medina County, a grass-roots group.
No Frack Ohio, a Columbus-based grass-roots group.
Fracking: Gas Drilling's Environmental Threat by ProPublica, an online journalism site.
Pipeline, blog from Pittsburgh Post-Gazette on Marcellus shale drilling.
Allegheny Front, environmental public radio for Western Pennsylvania.
From the national eco-group Food and Water Watch:
In response to the EPA's announcement today that it will no longer investigate possible ties between hydraulic fracturing and water contamination in Wyoming, Food & Water Watch executive director Wenonah Hauter said:
"The Environmental Protection Agency was created for the purpose of protecting Americans and their vital resources. So why is it abdicating this responsibility when escalating industrial activity such as hydraulic fracturing threatens the very communities and resources the EPA should be keeping safe? If there is any question whatsoever about the safety of fracking and its effects on drinking water supplies, the EPA should make it a top priority to investigate the matter fully."