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Backflow is when the normal direction of flow is reversed resulting in materials or contaminants entering the City water system. This can occur whenever the water pressure drops enough to cause a vacuum or "backsiphonage".
The following testers are certified by the State of Oregon and have provided paperwork to the City of Ashland. Backflow testers are private contractors and testing costs vary so it's recommended to obtain a price quote before scheduling the test.
Backflow assemblies have springs, moving parts and internal seals that are subjected to wear and fatigue. Backflow assemblies have to be tested by a certified tester listed on City of Ashland's list of approved testers.