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.
A recent check reveals that Ohio now has information posted on a web site on 67 horizontal natural gas wells.
That's up from only 12 reports that had been filed earlier on www.fracfocus.org.
There are also reports from 161 West Virginia wells and 1,768 in Pennsylvania.
The data is voluntarily provided by drilling companies.
The site lists toxic chemicals, water and sand that are going into wells to hydrauically fracture or frack the wells.
The chemical additives are used as iron-control agents, corrosion inhibitors, clay stabilizers, breakers, gelling agents, friction reducers, bactericides, scale inhibitors, pH adjusting agents, cross-linking agents, solvents and surfactants.
The website does not reveal volumes or concentrations. Instead, the site measures the chemicals as a percentage of the mass of the fracking liquids. That makes the toxic constituents look very tiny, down to five decimal places of 1 percent, in some cases.
But those totals can be very large, hundreds of tons, because of the sheer volume of chemicals used.
FracFocus went online in April 2011.
It is maintained by the Ground Water Protection Council and the Interstate Oil and Gas Compact Commission, two intergovernmental agencies. The U.S. Department of Energy provided financial assistance.
The chemical-disclosure registry has more than 110 participating firms
It is voluntary in Ohio but is mandatory in a few states.
The website provides well location by longitude and latitude, vertical depth and date the rock underground was fractured. It shows how much water was used in the process.
It identifies the chemicals used, their purpose, the chemical's ingredients, the maximum ingredient concentration (a percentage by mass) and the active ingredient concentration in the fracking liquid (again a percentage by mass).It does not provide weight or concentration, only a percentage of mass.
Companies are allowed to keep some materials undisclosed as proprietary or trade secrets,
The information comes from the chemical suppliers for the drilling and there is no third-party verification.
The information is posted after the fracturing is completed.
The U.S. Environmental Protection Agency is taking a look at fracking chemicals.