What is a Cross Connection?

A cross-connection is any point in the  public drinking water system that is actually or potentially connected  to a source of contamination or pollution that could enter the system  through backflow. Common cross-connections include automatic sprinkler  systems, soda fountains, fire suppression systems, and garden hoses  among many others. All cross-connections require backflow prevention.

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1. What is a Cross Connection?
2. What is Backflow?
3. How does Backflow happen?
4. How does this affect me?