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MCLs, DLRs and PHGs for Regulated Drinking Water Contaminants <br />Last Update: December 31, 2009 <br /> State <br />MCL <br />DLR PHG or <br />MCLG Date of <br />PHG <br />Gross beta particle activity - OEHHA <br />concluded in 2003 that a PHG was not <br />practical <br />4 mrem/yr <br />4 <br />(zero) <br />n/a <br />Radium-226 -- 1 0.05 2006 <br />Radium-228 -- 1 0.019 2006 <br />Radium-226 + Radium-228 (addressed <br />together as one MCL 5 - - <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 Organic 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 />Methyl tertiary butyl 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 />Trichloroeth 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 <br />113 1.2 0.01 4 1997 <br />Vinyl 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 />Atrazine 0.001 0.0005 0.00015 1999 <br />75A-13