Uncertainty about the health effects of perchlorate exposure has slowed efforts to establish drinking water and environmental cleanup standards. Occurrence

Perchlorate has been used heavily by DOD and its contractors, and perchlorate contamination has been found near weapons and rocket fuel manufacturing facilities and disposal sites, research facilities, and military bases. Fireworks, road flares, construction sites, and other manufacturing activities and facilities also have been sources of contamination. Monitoring also has been conducted to assess the presence of perchlorate in foods. In 2004, the Food and Drug Administration (FDA) tested 500 samples of foods, including vegetables, milk, and bottled water for perchlorate. (No effect was found in men.) EPA Assessment of Perchlorate for Regulation

Over the past decade, EPA has evaluated perchlorate to determine whether a federal drinking water standard is needed. NRC Perchlorate Study

To resolve some of the uncertainty and debate over perchlorate's health effects and the 2002 draft risk assessment, the interagency working group asked the National Research Council (NRC) to review the available science for perchlorate and EPA's draft assessment. On January 8, 2009, EPA announced that it would seek further advice from the NRC before making a final determination on whether or not to set a drinking water standard for perchlorate. EPA also announced that it was replacing the perchlorate preliminary remediation goal of 24.5 ppb with an interim health advisory, which contains a value of 15 ppb. In August 2009, the EPA Administrator announced that the agency would reevaluate the science regarding perchlorate's potential health effects, with particular emphasis on evaluating the effects of perchlorate exposure on infants and young children. The agency determined not to ask the NRC to conduct further review of issues related to perchlorate, having concluded that additional NRC review would unnecessarily delay the regulatory decision-making process. EPA noted its intent to consider a broader range of alternatives for interpreting the available data on the level of health concern, the frequency of occurrence of perchlorate in drinking water, and the opportunity for health risk reduction through a national drinking water standard. EPA intends to take public comments into account before making a final regulatory determination. H.R. 4252 , each entitled the Inland Empire Perchlorate Ground Water Plume Assessment Act of 2009, would direct the Secretary of the Interior, acting through the Director of the United States Geological Survey, to (1) complete a study of water resources in California, including the Rialto-Colton Basin ( H.R. 4252 ). 111-433 ) was passed by the House in March 2010, and ordered reported, without amendment, by the Senate Committee on Energy and Natural Resources in July. Relatedly, H.R. 1747 would have required EPA to set a standard for perchlorate.
Perchlorate is the explosive component of solid rocket fuel, fireworks, road flares, and other products. Used heavily by the Department of Defense (DOD) and related industries, perchlorate also occurs naturally and is present in some organic fertilizer. This soluble, persistent compound has been detected in drinking water supplies, especially in California. It also has been found in milk and many foods. Because of this widespread occurrence, concern over the potential health risks of perchlorate exposure has increased, and some states, water utilities, and Members of Congress have urged the Environmental Protection Agency (EPA) to set a federal drinking water standard for this chemical. Regulatory issues have involved the health risk reduction benefits and the costs of federal regulation, including environmental cleanup and water treatment costs, both of which are driven by federal and state standards.
EPA has spent years assessing perchlorate's health effects and occurrence to determine whether a national standard is warranted. The Food and Drug Administration (FDA) has supported this effort by testing produce and other foods for the presence of perchlorate. Interagency disagreements over the risks of perchlorate exposure led several federal agencies to ask the National Research Council (NRC) to evaluate perchlorate's health effects and EPA's risk analyses. In 2005, the NRC issued its report, and EPA adopted the NRC's recommended reference dose (i.e., the expected safe dose) for perchlorate exposure. Subsequent studies raised more concerns about the potential effects of low-level exposures, particularly for infants in certain cases.
In October 2008, EPA made a preliminary determination not to regulate perchlorate in drinking water. Then, in early January 2009, the agency announced that it again would seek advice from the NRC before making a final determination. EPA also announced that it was replacing the preliminary remediation goal for perchlorate of 24.5 parts per billion (ppb) with an interim health advisory, which contains a value of 15 ppb.
In August 2009, the EPA Administrator announced that the agency would reevaluate the science regarding perchlorate's potential health effects, with particular emphasis on evaluating the effects of perchlorate exposure on infants and young children. The agency determined not to ask the NRC to conduct further review of issues related to perchlorate, having concluded that additional NRC review would unnecessarily delay the regulatory decision-making process. EPA intends to consider public comments before making a final regulatory determination.
Perchlorate legislation in this Congress includes H.R. 3206, which would require EPA to set a drinking water standard for perchlorate. No action has been taken on this bill. Among perchlorate contamination cleanup bills, the House passed H.R. 4252 to direct the U.S. Geological Survey to complete a study of water resources (including a study of perchlorate contamination of ground water) in the Rialto-Colton Basin, California. In July 2010, the Senate Committee on Energy and Natural Resources ordered H.R. 4252 to be reported, without amendment. This report reviews perchlorate contamination issues and related developments.