A water backflow preventer does exactly what the name applies: it prevents contaminated water from backflowing into the potable water supply.  It reduces the risk of contaminated water leaking into the water supply; it ensures that water is suitable for drinking and other family uses; and it keeps the water pressure even so that backpressure does not occur.

A water backflow preventer should be installed and inspected by a licensed and certified backflow testing company, one like City Backflow Testing.  At City Backflow Testing you will find affordable backflow testing guaranteed to be of high-quality, the type of quality you would expect from the leaders in the industry.