Whenever the City deems that a service water usage contributes a sufficient hazard to the water supply and a property owner has not made appropriate installation, the installation of an approved backflow prevention device or assembly shall be required on the lateral service line of the owner's water system, at or near the property line, or immediately inside the building being served, but before the first branch line leading off the lateral service line in any event. The type of protective device or assembly shall comply with local and State requirements. Backflow assemblies must be on the List of Approved Assemblies published by the University of Southern California Foundation for Cross-Connection Control and Hydraulic Research. The owner shall provide the City Water Department with a certified test of such backflow prevention devices or assemblies within ten (10) working days after their initial installation in order to determine proper function. (Ord. 271, 8-11-2016)