Backsiphonage (Back•si•phon•age)

1. The backflow of possible contaminated water into the potable water supply system or the potable water distribution systems as a result of the pressure in the potable water system becoming unintentionally less than the atmospheric pressure in the plumbing fixtures, pools, tanks or vats that may be connected to the potable water distribution system

2. The siphoning back of used, contaminated or polluted water or other substances from a plumbing fixture, vessel, or other source, into the water supply pipe due to negative pressure in the supply pipe.

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