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Imported water Groundwater <br /> Parameter MCL (MCLG) Range Average 90th ~ of Sites g ~ Sites Typical Sourca of Contaminant <br /> Percentile Above the Sampled <br /> internal corrosion of household <br /> plumbing systems; erosion of <br /> Copper (ppm) AL=1.3 0.17 ND ND 0.2 0 53 natural deposits; leaching from <br /> wood preservatives <br /> Internal corrosion of household <br /> plumbing systems; erosion of <br /> Lead (ppb) AL=15 2 ND ND ND 0 53 natural deposits; discharges from <br /> industrial manufacturers <br /> Parameter MCL PHC' Imported water Groundwater or System <br /> [MRDL] MCLG Typical Source of Contaminant <br /> Volatile Organic Compounds [MRDLG] Range Average Range Average <br /> Leaking underground gasoline <br /> Methyl-tart-butyl-ether (MTBE) 13 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 /> Total Trihalomethanes (TTHM) By-product of drinking water <br /> 80 NA 36 - 66 46 ND - 67.1 16.3 <br /> (PPb) chlorination <br /> Haloacitic Acids (Five) (ppb) 60 NA 7.9 - 34 22 ND - 23.0 4.8 By-product of drinking water <br /> chlorination <br /> <br /> Total Chlorine Residual m Drinking water disinfectant added <br /> (pp ) [4] [4] 0.72 - 3.4 2.4 0.5 - 1.16 0.83 <br /> for treatment <br /> 75C-15 <br /> <br />