Why test your backflow
Federal and state law requires that backflow prevention devices be tested annually to ensure they are functioning properly. The reason for this is that when water flows backwards through the backflow preventer, the public drinking water source may become contaminated. The purpose of the backflow prevention device is to prevent this backwards water flow, but occasionally these devices fail. In order to keep drinking water clean and free of contaminants, the law states that the backflow device must be tested annually by a licensed backflow tester.