09/05/2007 Council Packet - Laserfiche WebLink

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DRAFT 8 -17 -07 II. WATER QUALITY INFORMATION AND COMPLAINTS The City of Lino Lakes provides drinking water to their consumers from five wells which range in depth from 258 feet to 338 feet. These ground water sources provide water to the residents and are in compliance with the current Primary Drinking Water Regulations. Water at the source and in the distribution system are sampled and analyzed on a regular basis by City staff and the Minnesota Department of Health. Contaminants included in the testing program include microbial, inorganic, pesticides, herbicides, organic chemicals, radioactive material, nitrate, nitrate nitrogen, trihalomethanes, and secondary contaminates. Secondary contaminates do not have maximum contaminant levels established as they are non health related. In general, maximum contaminant levels are established because the regulated substances represent hazards to health. In setting the maximum contaminant level, the total environmental exposure to humans of a specific contaminant has been considered by the regulating agency and an attempt has been made to set lifetime limits at the lowest practical level in order to minimize the amount of contaminant consumed in drinking water. From a review of the Minnesota Health Department regulations and well water sample results, the City's water supply currently meets the health related regulations. In addition to the state regulations, the Safe Drinking Water Act included non - enforceable guidelines for contaminants that may adversely affect the aesthetic quality of drinking water. Among these contaminants are iron, 0.3 mg /I (milligrams per liter), manganese, 0.05 mg/I, and pH in range 6.5 -8.5. Of these contaminants, iron and manganese, found in local ground water supplies, generate the most complaints from customers. Aesthetic components of drinking water include taste, odor, color, hardness and staining. Taste problems in water derive in part from salts and the presence of specific metals such as iron, copper, manganese, and zinc. Staining of laundry and house hold fixtures occur from water containing iron and manganese. The iron and manganese data for Lino Lakes' wells is shown on Table 1. Water Treatment Plant Study 2 13843.000