Whenever backflow protection has been found necessary on a water supply line entering a customer’s premises, then any and all water supply lines from the city’s mains entering such premises, buildings, or structures shall be protected by an approved backflow device, regardless of the use of the additional water supply lines. [Ord. 910 Art. 7, § 10, 2016; Ord. 878 Art. 7, § 10, 2015.]