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<br />may cause mottling of children's teeth, usually in children less than nine years old. Mottling, also <br />. known as dental fluorosis, may include brown staining and or/pitting of the teeth, and occurs only in <br />developing teeth before they erupt from the gums. <br /> <br />Contaminant Level-Found <br />(units) Range A verage/ Typical Source of Contaminant <br /> (2005 Reslllts* <br />Radon (pCill) N/A 276 Erosion of natural deposits. <br />(04/16/2003) <br /> <br />* This is the value used to determine compliance with federal standards. It sometimes is the highest <br />value detected and sometimes is an average of all the detected values. If it is an average, it may contain <br />sampling results from the previous yeat. <br /> <br /> <br />Radon is a radioactive gas which is naturally occurring in some groundwater. It poses a lung cancer risk <br />when gas is released from water into air (as occurs during showering, bathing, or washing dishes or . <br />clothes) and a stomach cancer risk when it is ingested. Because radon in indoor air poses a much greater <br />health risk than radon in drinking water, an Alternative Maximum Contaminant Level (AMCL) of 4,000 <br />. picoCuries per liter may apply in states that have adopted an Indoor Air Program, which compels <br />citizens, homeowners, schools, and communities to reduce the radon threat from indoorair. For states <br />without such a program, the Maximum Contaminant Level (MCL) of 300 pCiIl may apply. Minnesota <br />plans to adopt an Indoor Air Program once the Radon Rule 'is finalized. <br /> <br />Contaminant <br />(units) <br />Copper (ppm) <br /> <br />MCLG <br />N/A. ~ <br /> <br />AL <br />1.3 <br /> <br />90% <br />Level <br />.38 <br /> <br /># sites <br />over AL Typical Source of Contaminant <br />o out of 20 Corrosion of household plumb,ing. <br />systems; Erosion of' natural deposits'. <br />o out.of 20 Corrosion of household pluIllping' <br />systems; Erosion of natural deposits. <br /> <br /> <br />'Contaminant <br />(units) MRDLG MRDL **** ***** Typical Source of Contaminant . ., <br />Chlorine (ppm) 4 4 .2-1.1 .53 . Water additive' used -.to' control <br /> microbes. <br /> <br />****Highest and Lowest Monthly Average. <br />*****Highest Quarterly. Average. <br /> <br />Lead (ppb) <br /> <br />N/A <br /> <br />15 <br /> <br />3 <br /> <br />',. . <br /> <br />Some contaminants do not have Maximum Contaminant Levels established for them. These <br />. 0 " . <br /> <br />"unregulated contaminants" are assessed using state standards known as health risk limits to determineif <br />they pose a threat to human health. If unacceptable levels of an unregulated contaminant are found, the <br />response is the same as if an MCL has. been exceeded; the water system must inform its customers and <br />take over corrective actions. In the table that follows are the unregulated contaminants that were <br />detected: <br /> <br />Contaminant Level Found Typical Source of Contaminant <br />(units) Range Average/ <br /> (2005) Result <br />Sodium (ppm) (07/20/2004) N/A 11 Erosion of natural deposits. <br />Sulfate (ppm) (07/20/2004) N/A 17 Erosion of natural deposits. <br /> <br />3 <br />