A cross connection is a point in a plumbing system
where the potable water supply is connected directly or can
be connected directly to a non-potable source. Whenever an unprotected
cross connection exists, backflow may occur due to either "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.
Whenever a plumbing fixture is connected to the
potable water supply, a potential cross connection exists. Please
follow the links below for more information on cross connections:
