The positive flow of water can be reversed when there is a sudden reduction in water pressure in the distribution system, such as during firefighting or when a water main breaks. This can create a suction effect, drawing the non-potable substance into the potable water system.
Who Is Required To Test and How Often?
Backflow prevention assemblies are to be tested annually or more often if requested by the Environmental Division. The Cross Connection Program applies to and is primarily enforced on commercial businesses. However, circumstances may apply that would require these devices to be installed on non-commercial properties. It is recommended that when installed on residential properties that these devices be tested annually by a Certified Tester to ensure equipment performance.