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<br />Note: In situations in which only 5 samples are taken, the average of the two with the highest l~vels is <br />taken to determine the 90th percentile level. . - <br /> <br />pCi/l- PicoCuries per liter (a measure of radioactivity). <br />ppb~- Part per billion, which can also be expressed as micrograms per liter (ug/l). <br />ppm - Parts per million, which can also be expressed as -milligrams per liter (mg/l). <br />nd - No Detection. <br /> <br />N/A - Not applicable (does not apply). <br /> <br />Contaminant MCLG MCL Level Found Typical Source of Contaminant <br />(units) Range Average <br /> (2005) lResult* <br />Alpha Emitters 0 15.4 Nd-4.3 4.3 Erosion of natural deposits <br />(pCill) <br />Arsenic (ppb) 0 50 N/A 1.11 Erosion of natural deposits; Runoff <br />07-20-2004 from, orchards; Runoff from glass and <br /> electronics production wastes. <br />Barium (ppm) 2 2 N/A .06 Discharge of drilling wastes; <br />07 -20-2004 Discharge from metal refineries; <br /> Erosion of natural deposits. <br />Combined 0 5.4 nd-3.1 3.1 Erosion of natural deposits. <br />Radium (pC'iIl) <br />Fluoride (ppm) 4 4 .78-2.1 1.35 State of Minnesota requires all <br /> municipal water systems to add <br /> fluoride to the drinking water to <br /> promote strong teeth; Erosion of <br /> natural deposits; Discharge from <br /> fertilizer and aluminum factories. <br />HaIoacetic Acids 0 60 N/A 4 By-product of drinking water / <br />(HAAS) (ppb) disinfection. <br /> <br /> Level Found <br /> Range A veragel <br />Contaminant MCLG MCL (2004) Result* Typical Source. of Contaminant <br />(units) <br />TTHM (Total 0 80 N/A 9.6 By-product of drinking water <br />trihalomethanes) disinfection. <br />(ppb) <br /> <br />Some people who drink water containing fluoride in excess of the MeL over many years could get bone <br />disease, including pain and tenderness of the bones. Fluoride in drinking water at half the MCL or more <br /> <br />2 <br />