Backflow is a plumbing issue that happens when non-potable water flows backward into your clean water supply, risking contamination. This reversal is usually caused by sudden changes in water pressure—such as broken water mains or problems within your plumbing system—and can expose your home or business to serious health hazards.

To protect your drinking water, certified plumbers install backflow prevention devices like check valves, pressure vacuum breakers (PVB), reduced pressure zone (RPZ) valves, or double check valve assemblies (DCVA). These devices ensure water only flows in the safe direction and keep your supply free from harmful pollutants.