A. Title 17, Chapter V, Sections 7583 through 7622, inclusive, of the California Administrative Code, entitled "Regulations Relating to Cross-Connections," sets forth rules and regulations governing cross-connections. Said regulations are incorporated by reference and made a part of this code insofar as they are applicable to the protection of the public water supply.

B. Title 17, Section 7583, states, among other things, "The water purveyor has primary responsibility to prevent water from unapproved sources, or any other substance, from entering the public water supply system." The city of Petaluma, hereinafter "city," is a water purveyor within the meaning of Title 17.

C. In order to provide for an orderly and adequate means of protection of the public water supply from backflow, the requirements set forth in this chapter are reasonable and necessary. The city adopts these requirements for the protection of the public water supply from backflow. New water service connections shall be installed and existing water service connections shall be modified to conform to these requirements.