The owner of the property served by the City shall have any assemblies tested immediately upon installation, and at least annually thereafter by a Certified Backflow Prevention Assembly Tester. All such assemblies found not functioning properly shall be promptly repaired or replaced at the expense of the owner, occupant or person in control. In the event an assembly is moved, repaired or replaced it must be retested immediately. If any such assembly is not promptly repaired or replaced, the Director may deny or discontinue water service to the premise.