Backflow is the flow through a cross-connection from a possible source of contamination backwards into the drinking water system. It occurs when a cross-connection is joined to the water supply piping without a backflow preventer resulting in pressure reversal, either as backsiphonage or backpressure.

Backflow can be a health hazard for your family or neighbors if contaminated water enters the water supply plumbing system and is used for drinking, cooking or bathing. Chemical burns, fires, explosions, poisonings, illness and death have all been caused by backflow through cross-connections.

The City of Corpus Christi established the Backflow Prevention Program in 1996 to protect potable water. Corpus Christi Water leads community learning efforts to educate the public on protecting plumbing from backflow. CCW also surveys to identify possible cross-connections and inspects for proper installation of backflow prevention assemblies.