It is any connection between your drinking water and an unapproved source of water or any other contaminant. With a cross-connection, your drinking water can become contaminated when a backflow condition occurs.
So, what is backflow? Backflow is when the water in your pipes (the pipes after the water meter) goes backward (the opposite direction from its normal flow). There are two situations that can cause the water to go backward (backflow):
- Backpressure - the pressure in your pipes is greater than the pressure coming in
- Backsiphonage - a negative pressure in one of the pipes.