Back flow preventers are described by many different names include backflow valves, backwater valves and backflow preventers.  No matter what they are called, their primary job is to prevent contaminated water from flowing back into the potable water supply.

They work by automatically sensing a reversal in water flow in the pipe and they automatically close that water line until the conditions improve.  This dangerous situation can occur for a number of different reasons and that is why it is important, and required, that your backflow valves are tested annually by a certified backflow testing company.

City Backflow Testing is one such company. For affordable backflow testing, City Backflow Testing is the company to call in the Texas region.