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L. <br /> MAXIMUM CONTAMINANT LEVELS AND REGULATORY DATES <br /> FOR DRINKING WATER <br /> U.S. EPA VS CALIFORNIA <br /> SEPTEMBER 2007 <br /> Contaminant U.S. <br /> EPA California <br /> MCL (mg/L) Da e' 11 MCL(mg/L) I Effective Date <br /> Inorganics <br /> Aluminum 0.05 to 2 1/91 1 2/25/89 <br /> 0.2 9/8/94 <br /> Antimony 0.006 7/92 0.006 9/8/94 <br /> Arsenic 0.05 eff: 6/24/77 0.05 77 <br /> 0.010 eff: 1/23/06 <br /> Asbestos 7 MFL` 1/91 7 MFL 9/8/94 <br /> Barium 1 eff: 6/24/77 1 77 <br /> 2 1/91 <br /> Beryllium 0.004 7/92 0.004 9/8/94 <br /> Cadmium 0.010 eff: 6/24/77 0.010 77 <br /> 0.005 1/91 0.005 9/8/94 <br /> Chromium 0.05 eff: 6/24/77 0.05 77 <br /> 0.1 1/91 <br /> 1.3 6/91 1 77 <br /> Copper 1.3d 12/11/95 <br /> Cyanide 0.2 7/92 0.2 9/8/94 <br /> 0.15 6/12/03 <br /> Fluoride b 4 /86 2 4/98 <br /> 2 4/86 <br /> 0.05' eff: 6/24/77 0.05 e 77 <br /> Lead 0.015d 6/91 0.015d 12/11/95 <br /> Mercury 0.002 1 eff: 6/24/77 0.002 77 <br /> Nickel Remanded 0.1 9/8/94 <br /> Nitrate as N 10 eff: 6/24/77 as NO3 45 77 <br /> Nitrite as N 1 1/91 1 9/8/94 <br /> Total Nitrate/Nitrite as N 10 1/91 10 9/8/94 <br /> Perchlorate - - 0.006 10/18/07 <br /> Selenium 0.01 eff: 6/24/77 0.01 77 <br /> 0.05 1/91 0.05 1 9/8/94 <br /> Thallium 0.002 7/92 1 0.002 9/8/94 <br /> Radionuclides <br /> Uranium 30 ug/L 12/7/00 20 pCi/L 1/1/89 <br /> 20 Ci/L 6/11/06 <br /> Combined Radium-226+228 5 pCi/L eff: 6/24/77 5 pCi/L 77 <br /> 5 Ci/L 6/11/06 <br /> Gross Alpha particle activity 15 pCi/L eff: 6/24/77 15 pCi/L 77 <br /> (excluding radon & uranium 15 Ci/L 6/11/06 <br /> 4 millirem/yr eff: 6/24/77 50 pCi/L 77 <br /> Gross Beta particle activity 4 millirem/yr 6/11/06 <br /> 8 pCi/L eff: 6/24/77 8 pCi/L 77 <br /> Strontium-90 now covered by 8 pCi/Lf 6/11/06 <br /> Gross Beta <br /> 20,000 pCi/L eff: 6/24/77 20,000 pCi/L 77 <br /> Tritium now covered by 20,000 pCi/Lf 6/11/06 <br /> Gross Beta <br /> Federal and State MCLS—Updated 09/20/07 Page I of 4 <br />