They are: Bakken Shale – Kildeer, and Dunn Counties, North Dakota Barnett Shale – Wise and Denton Counties, Texas (Hydraulic Fracturing is currently banned in Denton County as of November 4, 2014) Marcellus Shale – Bradford and Susquehanna Counties, Pennsylvania Marcellus Shale – Washington County, Pennsylvania Raton Basin (coalbed methane) – Las Animas County, Colorado Dr. Robin Ikeda, deputy director of Noncommunicable Diseases, Injury and Environmental Health at the CDC noted that none of the following EPA investigation sites were included in the final version of EPA's Study of the Potential Impacts of Hydraulic Fracturing on Drinking Water Resources: Dimock, Pennsylvania; LeRoy, Pennsylvania; Pavillion, Wyoming; Medina, Ohio; Garfield County, Colorado. The completed report draft was posted in 2015 and is available on the EPA website. The report concluded that while very few cases of water contamination have been found relative to the abundance of fracking, there are several concerns for potential contamination in the future. The report was not regulatory in nature but instead was created to inform local governments, the public, and industry, of current data for use in future decision making. A majority of the EPA SAB advised the agency to scale back proposed toxicity testing of fracking chemicals, and not pursue development of tracer chemicals to be added to frack treatments, because of time limitations. Chesapeake Energy agreed with the recommendation. The SAB advised EPA to delete proposed toxicity tests from the study scope, due to limited time and funds. However, some members of the SAB urged the board to advise the EPA to reinstate the toxicity testing of hydraulic fracturing chemicals. Chesapeake Energy agreed, stating “an in-depth study of toxicity, the development of new analytical methods and tracers are not practical given the budget and schedule limitation of the study.” Thus, despite concerns about the elevated levels of iodine-131 (a radioactive tracer used in hydraulic fracturing) in drinking water in Philadelphia and Pittsburgh, downstream from hydraulic fracturing sites, iodine-131 is not listed among the chemicals to be monitored in the draft plan for the study. Other known radioactive tracers used in hydraulic fracturing but not listed as chemicals to be studied include isotopes of gold, xenon, rubidium, iridium, scandium, and krypton. Water use Hydraulic fracturing uses between of water per well, with large projects using up to . Additional water is used when wells are refractured. An average well requires of water over its lifetime. According