The following are hazardous plumbing conditions:
(A) Plumbing that permits contamination of the water supply through backflow, back-siphonage or any other method of contamination.
(B) Water supply inlets below the flood level of any sink, lavatory, bathtub or other fixture, and submerged inlets except those with a vacuum breaker complying with the plumbing code.
(C) The waste line of a water-using fixture that is not trapped.
(Ord. No. 11.66, § 304(9), 2-4-66)