This report summarizes findings from the US Environmental Protection Agency's (EPA) hydraulic fracturing study. The goal of this first phase of the study was to determine if a threat to public health as a result of underground sources of drinking water (USDW) contamination from hydraulic fracturing of coalbed methane (CBM) wells (herein known as hydraulic fracturing) exists, and if so, is it high enough to warrant further study. Based on the information collected, the potential threats to USDWs posed by hydraulic fracturing of CBM wells appear to be low and do not justify additional study.