Backflow Preventers Explained: When You Need One
A backflow preventer is a plumbing device designed to stop backflow—the unwanted reversal of water flow that can pull contaminants into a building’s drinking-water lines. Instead of water moving normally from the supply into your home or facility, pressure changes can force water to flow in the opposite direction, creating a potential health risk.
Backflow can occur when there’s a drop in water pressure on the public side (for example, during a main break or heavy demand). If your plumbing has certain connections or risk sources, contaminants may be drawn backward through the system.
What backflow preventers protect against
Backflow can move a wide range of substances into potable water systems, including chemicals used in irrigation, wastewater from drains connected to irrigation lines, or other contaminants associated with cross-connections. The goal of a preventer ... Read more »

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