AGA conducted a detailed survey of its member natural gas utility companies in September 2009 to collect data to respond to a letter dated August 28, 2009 from Maria J. Doa, PhD, Director, U.S. EPA National Program Chemicals Division. AGA conducted a supplemental survey in October 2009 to collect additional information to respond to EPA’s request for information. This document provides a summary of the information we collected in response to EPA’s request.