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MCLs, DLRs and PHGs for Regulated Drinking Water Contaminants <br /> Last Update: December 31, 2009 <br /> State DLR PHG or Date of <br /> MCL MCLG PHG <br /> Gross beta particle activity - OEHHA <br /> concluded in 2003 that a PHG was not 4 mrem/yr 4 (zero) n/a <br /> ractical <br /> Radium-226 1 0.05 2006 <br /> Radium-228 1 0.019 2006 <br /> Radium-226 + Radium-228 (addressed 5 <br /> to ether as one MCL <br /> Strontium-90 8 2 0.35 2006 <br /> Tritium 20,000 1,000 400 2006 <br /> Uranium 20 1 0.43 2001 <br /> Chemicals with MCLs in 22 CCR §64444-Organic Chemicals <br /> (a) Volatile Or anic Chemicals (VOCs) <br /> Benzene 0.001 0.0005 0.00015 2001 <br /> Carbon tetrachloride 0.0005 0.0005 0.0001 2000 <br /> 1,2-Dichlorobenzene 0.6 0.0005 0.6 1997 <br /> rev2009 <br /> 1,4-Dichlorobenzene -DCB 0.005 0.0005 0.006 1997 <br /> 1,1-Dichloroethane 1,1-DCA 0.005 0.0005 0.003 2003 <br /> 1,2-Dichloroethane (1,2-DCA) 0.0005 0.0005 0.0004 1999 <br /> rev2005 <br /> 1,1-Dichloroeth lene 1,1-DCE 0.006 0.0005 0.01 1999 <br /> cis-1,2-Dichloroeth lene 0.006 0.0005 0.1 2006 <br /> trans-1,2-Dichloroeth lene 0.01 0.0005 0.06 2006 <br /> Dichloromethane (Methylene chloride) 0.005 0.0005 0.004 2000 <br /> 1,2-Dichloro ro ane 0.005 0.0005 0.0005 1999 <br /> 1,3-Dichloropropene 0.0005 0.0005 0.0002 1999 <br /> rev2006 <br /> Eth (benzene 0.3 0.0005 0.3 1997 <br /> Meth I tertia but I ether MTBE 0.013 0.003 0.013 1999 <br /> Monochlorobenzene 0.07 0.0005 0.2 2003 <br /> Styrene 0.1 0.0005 0.1 <br /> 1,1,2,2-Tetrachloroethane 0.001 0.0005 0.0001 2003 <br /> Tetrachloroeth lene PCE 0.005 0.0005 0.00006 2001 <br /> Toluene 0.15 0.0005 0.15 1999 <br /> 1,2,4-Trichlorobenzene 0.005 0.0005 0.005 1999 <br /> 1,1,1-Trichloroethane 1,1,1-TCA 0.2 0.0005 1 2006 <br /> 1,1,2-Trichloroethane 1,1,2-TCA 0.005 0.0005 0.0003 2006 <br /> Trichlorceth lene TCE 0.005 0.0005 0.0017 2009 <br /> Trichlorofluoromethane Freon 11 0.15 0.005 0.7 1997 <br /> 1,1,2-Trichloro-1,2,2-Trifluoroethane (Freon 1 2 0.01 4 1997 <br /> 113 <br /> Vin I chloride 0.0005 0.0005 0.00005 2000 <br /> X lenes 1.75 0.0005 1.8 1997 <br /> (b) Non-Volatile Synthetic Organic Chemicals (SOCs) <br /> Alachlor 0.002 0.001 0.004 1997 <br /> <br /> Atrazine 0.001 0.0005 0.00015 1999 <br /> 75C-10 <br /> <br />