Backflow Prevention
In 1997, the Missouri Department of Natural Resources revised a drinking water regulation
entitled “Backflow Prevention.” This revised regulation places certain responsibilities on water
suppliers to ensure that customer facilities identified as actual or potential backflow hazards
provide the necessary protection to prevent contaminants from entering the public water system.
What is Backflow?
Backflow is defined as the unwanted reversal of flow in a water distribution system. Due to
changes in the hydraulic pressure in a water distribution system or a piping system inside a
customer’s premises, backflow occurs on a regular basis.
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