Only backflow prevention assemblies which have been approved by the city shall be acceptable for installation by a water user. A list of approved backflow prevention assemblies will be provided upon request to any affected customer. Backflow prevention assemblies shall be installed in accordance with the city of Wasco improvement standards, as shown in Appendix A. Location of the assemblies shall be as close as practical to the user’s connection. The city shall have the final authority in determining the required location of a backflow prevention assembly. Testing of backflow assemblies shall be conducted only by a person who is certified pursuant to state law, and testing will be the responsibility of the customer. Backflow prevention assemblies must be tested at least annually and immediately after installation, relocation, or repair. More frequent testing may be required if deemed necessary by the city. No assembly shall be placed back in service unless it is functioning as required. These assemblies shall be serviced, overhauled, or replaced whenever they are found to be defective, and all costs of testing, repair, and maintenance shall be borne by the customer. Approval must be obtained from the city prior to removing, relocating, or replacing a backflow prevention assembly. (Ord. 712 §1, 2020).