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Imported water Groundwater <br /> Parameter MCL PHG 90th ~ ~ Srtes R of Sites Typical Source of Contaminant <br /> (MCLG) Range Average the <br /> Percentile Sampled <br /> internal corrosion of household <br /> Copper (ppm) AL=1.3 0.3 ND ND 0.2 0 53 plumbing systems; erosion of <br /> natural deposits; leaching from <br /> wood preservatives <br /> Internal corrosion of household <br /> Lead (ppb) AL=15 2 ND ND ND 0 53 plumbing systems; erosion of <br /> natural deposits; discharges from <br /> industrial manufacturers <br /> Parameter MCL PHG Imported water Groundwater or System <br /> [MRDL] MCLG Typical Source of Contaminant <br /> Volatile Organic Compounds [MROLG] Range Average Range Average <br /> Leaking underground gasoline <br /> Methyl-tart-butyl-ether (MTBE) 5 13 ND ND ND ND storage tanks and pipelines; <br /> (PPb) discharge from petroleum and <br /> chemical factories <br /> Disinfection By-Products, Disinfectant Residuals -Values are for the distribution system based on annual running average <br /> <br /> Total Trihalomethanes (TTHM) 80 NA c ND - 55.3 15 By-product of drinking water <br /> (PPb) ( ) (d) chlorination <br /> Haloacitic Acids (Five) (ppb) 60 NA (c l ND - 20.9 4 2 By-product of drinking water <br /> (d) chlorination <br /> <br /> Total Chlorine Residual (ppm) [4] [4] 0.72 - 3.4 2.4 0.67 - 0.97 0.76 Drinking water disinfectant added <br /> for treatment <br /> 75C-21 <br /> <br />