back siphonage


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back siphonage

A reversal of the normal flow of water or other liquid due to a negative-pressure gradient. Back siphonage in a water system may result in contamination, triggering a “boil order” (i.e., an order to boil water before drinking so as to kill potential contaminants).
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atmospheric pressure), back siphonage occurs and vacuum breakers are appropriate backflow prevention devices.
Most outbreaks involved private water supplies and were caused by direct fecal contamination, back siphonage from a nonpotable source into a potable system, or cross-connections between such systems.