EPA Eases Controversial Cancer Risk Factor In Final IRIS Cr6 Assessment

After more than a decade of development, EPA has finalized a new Integrated Risk Information System (IRIS) assessment of hexavalent chromium (Cr6) that is expected to spur new drinking water rules for the ubiquitous contaminant -- but with a more lenient cancer risk estimate than its drafts, potentially easing any regulatory limits. The final IRIS assessment , which EPA’s research office released late on Aug. 1, marks the culmination of a years-long effort to re-evaluate risks posed by Cr6 in...