Whenever backflow protection has been found necessary on a water supply line entering a customer's premises, any and all water supply lines entering such premises shall be protected by an approved backflow, reduced pressure or air gap devices, regardless of the use of the additional water supply lines.
(`83 Code, § 13.04.330) (Ord. 80-16 (part), 1980; Ord. 82-21 (part), 1982; Ord. 88-20 § 3, 1988)