All premises served by the public potable water supply system of the City of Mt. Vernon shall provide protection of the potable water system from contamination due to backflow or back-siphonage of contaminants through the water service connection in accordance with the Illinois Plumbing Code and in accordance with this Subsection which is enacted pursuant to said Illinois Plumbing Code.
(Prior Code, Art. 16, § 16.3(p)(A))