EPA Considers Establishing an Enforceable MCL for Hexavalent Chromium

Since 2008, EPA has been re-evaluating its 20-year old drinking water standard for total chromium with respect to the carcinogenicity of orally ingested hexavalent chromium (chromium-6), the more toxic species of the metal. EPA is being pressured about the findings of a draft assessment of chromium-6 by both industry (claiming overestimate of risk) and environmental groups (claiming underestimate of risk). Whatever the outcome of the argument, EPA is likely to establish a chromium-6 MCL that is significantly lower than the current total chromium standard. This will have major implications for sites investigating, monitoring, or remediating media impacted by chromium-6, as well as for our nation's municipal drinking water supply systems. Click Here to read more.