Largest Natural Gas Producers in Appalachia (PA, WV, Ohio)
The largest gas producers in Pennsylvania, West Virginia and Ohio, ranked by 2025 gas reported to state regulators, credited to each well's current operator.
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Appalachian Basin Oil and Gas: Ohio, Pennsylvania, West Virginia
Ohio, Pennsylvania and West Virginia sit over the Marcellus and Utica shales and share a long history of conventional drilling, which leaves each state with a large number of older, plugged and orphaned wells alongside modern horizontal ones.
Each state keeps its own records: the Ohio Department of Natural Resources, the Pennsylvania Department of Environmental Protection and the West Virginia Department of Environmental Protection. These posts explain how to use each agency's well locator or mapping tool and what it leaves out.
The posts cover finding a well by API number, name, operator or location in each state's system, what production, permit and inspection records exist, and where the three states differ in what they publish. They also note where older wells are missing coordinates or complete records.
6 posts in this topic
ODNR Well Locator Guide: Search by Address, See Orphan Wells
How to use Ohio's free ODNR well viewer: find any of 242,295 oil and gas wells by address or radius, including orphan wells the Well Database omits.
Class II Injection Wells and the Other UIC Classes, Explained
About 180,000 Class II oil and gas injection wells operate in the US, most for enhanced recovery, not disposal. The six UIC classes and where records live.
WVDEP Oil and Gas: Which Search Tool Answers Your Question
The WVDEP Office of Oil and Gas runs six separate search tools. Here is which one answers which question about a West Virginia well, and what none of them show.
PA DEP Oil and Gas Mapping Tool: How to Search Any PA Well
The PA DEP Oil and Gas Mapping tool shows where wells are, but production and inspections sit in separate reports. How to see all three for any mapped PA well.
Ohio Gas Well Map: ODNR Wells With Production and Inspections
The ODNR well viewer shows one well at a time. See about 242,000 Ohio wells on one map with production, gas composition and inspection history per well.