A type of cross-connection that can occur in a potable water system Backflow is the unwanted reverse flow of contaminated water through a cross-connection into a potable water system It can occur whenever the pressure in the potable water supply drops below the pressure of the contaminated supply
The flow of liquids through irrigation into the pipes of a potable or drinking water supply from any source which is opposite to the intended direction of flow
The flow of water or other liquids, mixtures, or substances into the distributing pipes of a potable supply of water from any source or sources other than its intended source (2)
A reverse flow condition created by a difference in water pressures that causes water to flow back into the distribution pipes of a drinking water supply from any source other than the intended one
l the contamination of supply line water when waste water flows back, primarily by siphoning but can also be caused by cross-connection or other plumbing problems