Backflow is the undesired reversal of flow of water in a potable water system due to unplanned changes or fluctuations in the pressure of the system. These changes can be caused by several common occurrences, including water main breaks, pump failures, head pressure form elevated piping, booster pumps, low supply pressure, and interior backpressure.

A cross-connection is an actual or potential connection between the safe drinking water (potable) supply and a source of contamination or pollution. State plumbing codes require approved backflow prevention methods to be installed at every point of potable water connection and use. Cross-Connections must be properly protected or eliminated.

A backflow preventer is a device, assembly, or other method used to prevent backflow into the potable water system.

Just like any other mechanical device, backflow prevention assemblies are prone to wear and tear, and do break down from time to time. Regular testing is required in order to ensure that your device remains in proper working order.

Examples of corrective action could be replacing worn or faulty backflow preventer parts or modifying non-compliant backflow preventer plumbing.