An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to www.epa.gov. This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

EPA's Study of Hydraulic Fracturing and Its Potential Impact on Drinking Water Resources

National Hydraulic Fracturing Study Evaluation of Existing Production Well File Contents: QAPP

This QAPP describes the technical details and associated quality assurance and quality control procedures for the well file review research project.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.

National Hydraulic Fracturing Study Evaluation of Existing Production Well File Contents: QAPP, Revised August 19, 2013 (PDF)(53 pp, 606 K)