No plumbing fixture, device, or connection shall be installed which will result in a cross-connection between a distribution system of water for drinking and domestic purposes and a drainage system, soil. or waste pipe so as to permit or make possible the backflow of sewage or waste into the water supply system. No installation of potable water supply piping or part thereof shall be made in such a manner that it will be possible for used, unclean, polluted. or contaminated water, mixtures, or substances to enter any portion of such piping from any tank, receptacle, equipment. or plumbing fixture by reason of back siphonage, by suction or any other cause, either during normal use and operation thereof or when any such tank, receptacle, equipment. or plumbing fixture is flooded, or subject to pressure in excess of the operating pressure in the hot or cold water piping.
(Ord. 1116, passed 2-25-1957; Ord. 1873, passed - -1970; Ord. 4255, passed 1-19-2021)