On June 30th, the Pennsylvania Department of Environmental Protection made public the fluids used to hydraulically fracture the ground in PA. You can find that list on the DEP’s site here. However, some controversy ensued due to a mix up between the DEP & the material safety data sheets. Diesel fuel, which is listed in the linked document above for example, is only stored on site for other purposes – not injected into the ground.

“The original list was a compilation of the chemicals identified on safety documents called material safety data sheets that hydraulic fracturing contractors must submit to the department, but he [Scott Perry, the director of DEP’s Bureau of Oil and Gas Management] did not realize that it included substances the contractors use both above and below ground on a well site, he said. The second list was winnowed by a DEP chemist, who recognized that some of the chemicals on the initial list are not among those injected underground during the fracturing process.” …

CHEC’s director, Conrad Dan Volz, DrPH, MPH, said he understands that the department is trying to respond to an “absolute clamor out there to get this information,” but he said the list posted Wednesday is more an attempt to “mollify people’s complaints that they are not releasing information” than to provide data that citizens can use if they want to test their drinking water before & after drilling. “What to me is valuable is to get information on not only what goes down but also what comes up” from the wells in the form of salt & metals-laden waste fluids, he said. (The Times-Tribune)

The map below shows all of the public & private water wells in PA in blue & the Marcellus Shale wells drilled to date in black (as well as vividly demonstrates why we need to be vigilant of the potential impact that this industry can have on our quality of life). [image removed] 
In response to growing frustration over the lack of industry disclosure of these chemicals, Range and Chief plan to disclose the chemicals it uses to hydraulically fracture methane gas wells in the Marcellus Shale region.