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MCLs, DLRs and PHGs for Regulated Drinking Water Contaminants <br />Last Update: December 31, 2009 <br />75A -13 <br />State <br />MCL <br />DLR <br />PHG or <br />MCLG <br />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 <br />-- <br />1 <br />0.05 <br />2006 <br />Radium -228 <br />-- <br />1 <br />0.019 <br />2006 <br />Radium -226 + Radium -228 (addressed <br />together as one MCL <br />5 <br />- <br />- <br />Strontium -90 <br />8 <br />2 <br />0.35 <br />2006 <br />Tritium <br />20,000 <br />1,000 <br />400 <br />2006 <br />Uranium <br />20 <br />1 1 <br />1 0.43 <br />2001 <br />Chemicals with MCLs in 22 CCR §64444- Organic Chemicals <br />(a) Volatile Organic Chemicals (VOCs) <br />Benzene <br />0.001 <br />0.0005 <br />0.00015 <br />2001 <br />Carbon tetrachloride <br />0.0005 <br />0.0005 <br />0.0001 <br />2000 <br />1,2- Dichlorobenzene <br />0.6 <br />0.0005 <br />0.6 <br />1997 <br />rev2009 <br />1,4- Dichlorobenzene -DCB <br />0.005 <br />0.0005 <br />0.006 <br />1997 <br />1, 1 -Dichloroethane 1,1 -DCA <br />0.005 <br />0.0005 <br />0.003 <br />2003 <br />1,2- Dichloroethane (1,2 -DCA) <br />0.0005 <br />0.0005 <br />0.0004 <br />1999 <br />rev2005 <br />1,1- Dichloroeth lene 1,1 -DCE <br />0.006 <br />0.0005 <br />0.01 <br />1999 <br />cis- 1,2- Dichloroeth lene <br />0.006 <br />0.0005 <br />0.1 <br />2006 <br />trans- 1,2- Dichloroeth lene <br />0.01 <br />0.0005 <br />0.06 <br />2006 <br />Dichloromethane (Methylene chloride) <br />0.005 <br />0.0005 <br />0.004 <br />2000 <br />1,2- Dichloro ro ane <br />0.005 <br />0.0005 <br />0.0005 <br />1999 <br />1,3- Dichloropropene <br />0.0005 <br />0.0005 <br />0.0002 <br />1999 <br />rev2006 <br />Eth (benzene <br />0.3 <br />0.0005 <br />0.3 <br />1997 <br />Methyl tertiary butyl ether MTBE <br />0.013 <br />0.003 <br />0.013 <br />1999 <br />Monochlorobenzene <br />0.07 <br />0.0005 <br />0.2 <br />2003 <br />Styrene <br />0.1 <br />0.0005 <br />0.1 ° <br />1,1,2,2 - Tetrachloroethane <br />0.001 <br />0.0005 <br />0.0001 <br />2003 <br />Tetrachloroeth lene (PCE) <br />0.005 <br />0.0005 <br />0.00006 <br />2001 <br />Toluene <br />0.15 <br />0.0005 <br />0.15 <br />1999 <br />1,2,4 - Trichlorobenzene <br />0.005 <br />0.0005 <br />0.005 <br />1999 <br />1, 1, 1 -Trichloroethane 1,1,1 -TCA <br />0.2 <br />0.0005 <br />1 <br />2006 <br />1,1,2- Trichloroethane 1,1,2 -TCA <br />0.005 <br />0.0005 <br />0.0003 <br />2006 <br />Trichloroeth lene (TCE) <br />0.005 <br />0.0005 <br />0.0017 <br />2009 <br />Trichlorofluoromethane Freon 11 <br />0.15 <br />0.005 <br />0.7 <br />1997 <br />1,1,2 - Trichloro- 1,2,2 - Trifluoroethane (Freon <br />113 <br />1.2 <br />0.01 <br />4 <br />1997 <br />Vinyl chloride <br />0.0005 <br />0.0005 <br />0.00005 <br />2000 <br />X lenes <br />1 1.75 <br />0.0005 <br />1.8 <br />1997 <br />(b) Non - Volatile Synthetic Organic Chemicals (SOCs) <br />Alachlor 1 <br />0.002 <br />1 0.001 <br />1 0.004 <br />1 1997 <br />Atrazine 1 <br />0.001 <br />1 0.0005 <br />1 0.00015 <br />1 1999 <br />75A -13 <br />