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What Is A Backflow Preventer And How Does It Work?

Updated: Oct 26, 2020

A backflow preventer is a device that’s installed on your home’s water pipes that allows water to flow in one direction but never in the opposite direction.Its sole job is to prevent drinking water from being contaminated due to backflow.


How does “backflow” happen in the first place?

But sometimes, due to pressure changes in the pipes, that water can actually flow backwards and seep back into the main water supply line.

For example, backflow can happen when there’s a break in the main water line or when a fire hydrant is opened for use. Because pressure is lost during these events, water is no longer being pushed forward into your home and will flow backwards into the city water lines.


And when this happens, backflow can contaminate the public drinking supply with:

  • Fertilizers/pesticides

  • Human waste

  • Chlorine from pools/spas

  • Soap from sinks/dishwashers/showers

And that’s where a backflow prevention system comes in handy.


A backflow prevention system… prevents backflow

Backflow prevention systems are devices installed onto a pipe that only allow water to flow in one direction. Think of it as a one-way gate that allows water from the city’s public water supply to flow into your home’s piping but stops water if and when it ever tries to flow backwards into the main water supply.


How do I know if I need a backflow prevention system installed at my house?

Newer homes may have built-in backflow preventers on certain water lines but in order to know for sure whether your home has proper backflow preventers set up, we suggest having one of our plumbers inspect your home’s water system. They’ll install backflow preventers where it’s needed.


So contact us! We’ll send out a plumber to inspect your system and provide the solutions needed to keep your drinking water safe from contamination.


📞 Monroe: (305) 367-3902

📞 Miami-Dade: (305) 248-3333

📞 Emergencies: (786) 402-5319


#plumbing#plumbingservice#backflow#backflowinstallation#inspections#threeamigosplumbing

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