The purpose of this article is to:
(a) Protect the public potable water supply of the city from the possibility of contamination or pollution by isolating within a user's internal distribution system or a user's private water system, contaminants or pollutants which could backflow or back-siphon into the city water supply system;
(b) Promote the elimination or control of existing cross-connections, actual or potential, between a user's potable water system and that user's nonpotable water system, plumbing fixtures and/or industrial piping system;
(c) Provide for the maintenance of a continuing program of cross-connection control which systematically and effectively prevents the contamination or pollution of all potable water systems. (Ord. No. 1113, § 4 (part).)