Groundwater contamination was the fist consequence identified with natural gas drilling. The fracking process is identified with this. These are links that try to identify this could happen.
- - 1946 - [June 5, 2015] - USGS, USGA - "Dissolved Methane in New York Groundwater"
- "New York State is underlain by numerous bedrock formations of Cambrian to Devonian age that produce natural gas and to a lesser extent oil. The first commercial gas well in the United States was dug in the early 1820s in Fredonia, south of Buffalo, New York, and produced methane from Devonian-age black shale. Methane naturally discharges to the land surface at some locations in New York."
- - 2063 - [June 19, 2015] - Environmental Science & Technology, Zacariah Louis Hildenbrand, Doug D Carlton, Brian Fontenot, Jesse M. Meik, Jayme Walton, Josh Taylor, Jonathan Thacker, Stephanie Korlie, C. Phillip Shelor, Drew Henderson, Akinde Florence Kadjo, Corey Roelke, Paul F. Hudak, Taylour Burton, Hanadi S. Rifai, and Kevin A. Schug - "A Comprehensive Analysis of Groundwater Quality in The Barnett Shale Region"