WASHINGTON (EPA) - The U.S. Environmental Protection Agency (EPA) provided an update on Dec. 21 on its ongoing national study currently underway to better understand any potential impacts of hydraulic fracturing on drinking water resources. Results of the study, which Congress requested EPA to complete, are expected to be released in a draft for public and peer review in 2014. The update outlines work currently underway, including the status of research projects that will inform the final study.