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.
The Obama Administration will require energy companies to certify that they are not threatening local water supplies when using hydraulic fracturing or fracking to extract natural gas and oil on federal land, the Interior Department said today.
Interior Secretary Ken Salazar told a congressional hearing that his agency is working on additional regulations that will lower the risk of water supplies becoming tainted.
The industry certificates will strengthen the oversight of the federal Bureau of Land Management, which is sending inspectors to drilling sites on federal land to ensure proper well design and waste-water management, Bloomberg reported.