What causes a cross connection?
A cross connection may occur due to backflow caused by unprotected fixtures that are subjected to backsiphonage or backpressure. Backsiphonage is caused by a negative or reduced pressure in the supply line to a facility or plumbing fixture. Backpressure may cause backflow to occur whenever a potable water system is connected to another system at a higher pressure.

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1. Who can test my backflow assembly?
2. How often must I have my backflow assembly tested?
3. What is a cross connection?
4. Where are cross connections found?
5. What causes a cross connection?