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Underground Injection Control Program: Hydraulic Fracturing
Background about hydraulic fracturing, "the injection of fluid under pressure to facilitate the production of oil and natural gas. This page explains the process of hydraulic fracturing, how hydraulic fracturing is regulated, and [U.S. Environmental Protection Agency] EPA's national study on hydraulic fracturing of coalbed methane." Includes a link to the detailed study, which assesses potential contamination of underground sources of drinking water (USDWs). From the EPA.
http://www.epa.gov/ogwdw/uic/wells_hydrofrac.html

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