Charting the Conversation (IMAGE)

University of Pittsburgh

Charting the Conversation

Caption

This is data showing locations of wells drilled since 2004 are from the Pennsylvania Department of Environmental Protection (PA DEP). Methane data are from the Shale Network database (2), contributed by sources as indicated in the legend. All methane data describe groundwater, except data from volunteer groups that measured surface water. PA DEP positive determinations indicate that the PA DEP investigated and concluded that a shale-gas company was presumed responsible for contamination. Concentrations above 10 mg/liter in drinking water wells are considered by the USGS as requiring action.

Credit

<i>Science</i> 26 Jan 2018: Vol. 359, Issue 6374, pp. 395-397. DOI: 10.1126/science.aan6520. Reprinted with permission from AAAS.

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