Whenever the City deems a service connection's water usage contributes a sufficient hazard to the water supply, installation of an approved backflow prevention assembly shall be required on any lateral service line being served by the 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 assembly required shall depend upon the degree of hazard existing at the point of cross connection (whether direct or indirect) so as to comply with local and state requirements. Consumers shall provide for a test of all backflow prevention assemblies within ten (10) working days after their initial usage in order to determine their adequacy. (Ord. 91-02 § 5)