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Backflow Prevention and Cross-Connection Control

What is a cross-connection? 
Any physical connection created between a possible source of contamination and any drinking water system piping.

What is backflow? 
It is the flow through a cross-connection from a possible source of contamination back into the drinking water system. It occurs when a cross-connection is created and a pressure reversal, either as backsiphonage or backpressure, occurs in the water supply piping.