Why doesn?t EPA regulate chromium-6?
EPA does regulate chromium-6 (or hexavalent chromium) as part of the total chromium drinking water standard since 1992. The current drinking water standard sets the maximum level of total chromium allowed in drinking water, and this standard addresses all forms of chromium, including chromium-6. Since current testing does not distinguish what percentage of the total chromium is chromium-6 versus chromium-3, EPA?s regulation assumes that the sample is 100% chromium-6. This means the current total chromium standard has been as protective and precautionary as the science of that time allowed. For more information on chromium, please visit our Web site at the following URL: http://water.epa.gov/drink/contaminants/basicinformation/chromium.cfm
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