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Pollution - The presence of any foreign substance (organic, • inorganic, radiological, or biological) in the water that tends to degrade its quality so as to constitute a hazard or impair the usefulness of the water. Superintendent - The Superintendent of the Water Division of the Department of Public Works of the City of Charlottesville. Water, Nonpotable - Water that is not safe for human consump- tion or that is of questionable potability. Water, Potable - Water free from impurities in amounts suffi- cient to cause disease or harmful physiological effects. Its bacteriological and chemical quality shall conform to the require- ments of the Virginia Waterworks Regulations of the State Department of Health and the requirements of the Department of Public Works of the City of Charlottesville. Water System - All structures, appliances and equipment owned and operated by the City of Charlottesville or the Rivanna Water and Sewer Authority and used to collect, store, transport, purify and treat water for drinking or domestic use and the distribution of water to the public. • SECTION 29-19. Cross -Connection and Backflow Prevention Every building, premises or structure in the City of Charlottesville shall be constructed, equipped and maintained in such a manner as to prevent the possibility of pollution of the water supply by cross -connection or backflow of liquids. SECTION 29-20. Cross -Connections Prohibited (a) The City of Charlottesville potable water supply system shall be designed, installed, and maintained in such a manner as to prevent contamination from nonpotable liquids, solids, or gases from being introduced into the potable water supply through cross - connections or any other piping connections to the system. (b) Cross -connections between the City of Charlottesville potable water system and other systems or equipment containing water or other substances of unknown or questionable safety are prohibited except when and where, as approved by the Superintendent or Chief, suitable protective devices such as the reduced pressure zone backflow preventer or equal are installed, tested and maintained to insure proper operation on a continuing basis. 11