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r • <br /> Chromium-6 in Drinking Water About Chromium-6... <br /> California Environmental Health Association • Regulated under the"total chromium"MCL <br /> April 5,2001 • CA MCL=50 micrograms(pg/L)per liter <br /> • Federal MCL=100 pg/L per liter <br /> Steven Book • DLR=10 pg/L for total chromium <br /> Drinking water Program • DLR= 1 pg/L for Cr-6 <br /> Deparnnent of Health services <br /> (sbook@dhs.m.gov) <br /> i <br /> Health Effects... Enter the chromium PHG... <br /> • Cr-3 nutritionally required(50-200 pg/L • Health&Safety Code:OEHHA to establish <br /> per day) PHGs for all chemicals with MCLS <br /> • Cr-6 known to cause cancer in people when • PHGs to be used to determine whether <br /> exposures to airborne Cr-6 occurs in certain MCLS need to be revised(for new MCLs, <br /> workplace situations too) <br /> • Toxicologic effects associated with • OEHHA's PHG for Cr included estimates <br /> ingestion(irritation,ulceration,etc.)at very of the fraction of total Cr that is Cr-6 and a <br /> high doses) determination that Cr-6 is carcinogenic <br /> Chromium PHG(Feb 1999) DHS Response to PHG <br /> (March 1999) <br /> • PHG=2.5 pg/L;based on:(1) Cr-6 is 7% • DHS included Cr-6 as a contaminant for <br /> of total Cr and(2)"De minimis"cancer risk review for possible MCL development <br /> from Cr-6=0.2 pg/L • announced it would collect information on <br /> • Non-cancer endpoint from Cr-6=70 pg/L the extent of Cr-6 in drinking water via <br /> • Chromium-3"PHG"=250,000 pg/L unregulated chemical monitoring <br /> regulation. <br /> 1 <br />