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.
Two Ohio environmental groups want tighter state rules on injection wells.
Ohio needs to do more because of the influx of brine waste into Ohio from Pennsylvania and from the earthquakes reported at an injection well in Mahoning County, said the Columbus-based Ohio Environmental Council and the Ohio Environmental Law Center said.
The Ohio Department of Natural Resources' Division of Oil and Gas Resources Management has issued draft rules on the injection wells.
The two groups cited what attorney Trent Dougherty were "four overarching flaws" plus five omissions in the state's plan.
The biggest problems are: too much discretion is given to well operators to perform or not perform tests; only new wells are subject to continuous monitoring and other requirements, not existing wells; there is too little local community and government notice and comment; and the rules look only at migration and earthquakes, not other issues.
The groups have submitted their recommendations to the state.
Ohio has 196 permitted injection wells.
Locally, Portage and Stark counties are tied for No. 2 in the state with 16 wells each. Washington County (Marietta) has the most injection wells.
Click here to read more about the injection well issue.