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<br />I <br />I <br />I <br />I <br />I <br />'I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />IV. WATER SUPPLY <br /> <br />A. GENERAL <br /> <br />In late 1974, the Congress of the United States acted into law the <br />United States Safe Drinking Water Act. This act has had a tremendous <br />impact on the public and private water supply industry of the United <br />States. One provision of the Act is the eventual assumption by the states <br />of this Act and its enforcement. The Colorado State Board of Health has <br />assumed the enforcement of this Act effective on December 15, 1977. The <br />Safe Drinking Water Act identifies and outlines the limits of contaminants <br />that are allowed in all drinking water used for public consumption. <br />The removal of Giardia lamblia is also a primary consideration in the <br />water supply system of Colorado. <br /> <br />B. TREATMENT REQUIREMENTS <br /> <br />Regulations: Treatment requirements generally are dictated by State <br />regulations and raw water conditions. The Colorado Primary Drinking <br />Water Regulations are the principal standards governing drinking water <br />quality and treatment in Colorado. The Colorado Department of Health <br />has also issued a document entitled "Design Criteria for Potable Water <br />Systems," which contains guidelines for system design. The primary <br />regulations are slightly more restrictive than the requirements of the <br />United States Safe Drinking Water Act of 1974, and are administered by <br />the State. They deal primarily with the health and safety aspects of <br />drinking water, and include maximum contaminant levels (MCL) for tur- <br />bidity, microbiological contaminants, organic and inorganic chemicals, <br /> <br />IV-l <br />