The U.S. Environmental Protection Agency has announced that it has extended its schedule for reviewing the toxicology of hexavalent chromium in order to consider the results of new and emerging peer-reviewed research on the drinking water contaminant.
EPA expects to release a draft toxicology review for comment and external peer review in 2013 and finalize it in the fall of 2014. It provides opportunity to incorporate findings of mode-of-action research from the American Chemistry Council as well as addressing both inhalation and oral exposure risks.
Completion of the toxicological review will be the point at which EPA will begin to determine whether to regulate the chemical, which is now indirectly regulated through the total chromium standard.
Based on the recommendations of the external peer review panel, which met in May 2011 to review the draft IRIS assessment for hexavalent chromium (oral exposure only), EPA will consider the results of recently and soon to be completed peer-reviewed primary research on the chemical before finalizing the IRIS assessment. The oral assessment will be revised to address the peer review comments and combined with the inhalation assessment, which is currently in draft development.
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