U.S. EPA has reversed course and elected to regulate perchlorate under the Safe Drinking Water Act ("SDWA"). Reversing a controversial earlier decision not to regulate this chemical, on September 29, 2010, U.S. EPA sent a draft notice to the Office of Management and Budget outlining its decision to regulate perchlorate under the SDWA. This action, which had been broadly opposed by industry and the DoD, is the first step in setting an MCL for perchlorate which is expected to be well below the existing cleanup target of 15 ppb. Perchlorate is an ubiquitous contaminant in groundwater across the country and it is typically associated with rocket fuel and fertilizers. It is especially an issue in California where numerous drinking water supplies have been contaminated with perchlorate.