Backflow devices protect drinking water pipes from cross-contamination by wastewater. If your property is connected to the SPU water distribution system, you must have backflow devices fitted to any sprinklers, external taps, and other fixtures that are at risk of backflow. These devices must be tested annually. Affinity Plumbing and Water Conditioning plumbing company offers a backflow testing service in Shakopee, MN, to help ensure you’re meeting your home or commercial property maintenance obligations.