Clean, safe water is fundamental to our daily lives, and as homeowners in Los Angeles, CA, it is crucial to be aware of the measures required to protect the quality of our water supply. One such measure is backflow prevention – a vital component of any residential plumbing system that safeguards against the risk of contaminated water entering the potable water supply. As a leading provider of residential and commercial plumbing services in Los Angeles, John’s Plumbing & Drain Services is committed to assisting homeowners in ensuring their properties are protected against backflow risks.

In this informative blog post, we will discuss the causes and potential dangers of backflow, the importance of backflow prevention devices, and the role of regular testing and maintenance in safeguarding your home’s water supply. We will also emphasize the significance of partnering with a reliable plumbing service like John’s Plumbing & Drain Services to ensure your backflow prevention system is expertly installed, maintained, and monitored for optimal performance.

Understanding Backflow: Causes and Dangers

Backflow occurs when a reverse flow of water in the plumbing system causes contaminated water to mix with the clean, potable water supply. This can happen due to two primary reasons: backpressure and backsiphonage.

1. Backpressure: Backpressure occurs when the pressure in a non-potable water system (such as irrigation or fire sprinkler systems) exceeds the pressure in the potable water supply and forces contaminated water to flow backward into the clean water system.

2. Backsiphonage: Backsiphonage is caused by a sudden drop in water pressure (due to events like water main breaks or fire hydrant use), which creates a vacuum that pulls contaminated water from non-potable sources into the clean water supply.

Backflow can contaminate your home’s water supply with harmful substances like bacteria, pesticides, and chemicals, posing severe health risks to you and your family.

The Role of Backflow Prevention Devices

Backflow prevention devices are specifically designed to protect your home’s water supply by ensuring water flows in only one direction. There are several types of backflow prevention devices suitable for various applications, including:

1. Air Gap: An air gap is the simplest form of backflow prevention, consisting of a physical separation between the potable water supply and the potential source of contamination. This separation prevents backflow by eliminating any direct connection between the two systems.

2. Atmospheric Vacuum Breakers (AVBs): AVBs are mechanical devices that incorporate an air inlet valve that opens to break the vacuum when water pressure drops, preventing backsiphonage.

3. Reduced Pressure Zone (RPZ) Assemblies: RPZ assemblies are more complex devices designed for high-hazard applications, featuring two independent check valves and a pressure relief valve to ensure optimal backflow protection.

Regular Testing and Maintenance for Optimal Backflow Prevention

A crucial aspect of backflow prevention is regular testing and maintenance of your backflow prevention devices. Over time, components may wear out or require adjustment, potentially compromising their performance. Routine testing, conducted by certified professionals like John’s Plumbing & Drain Services’s technicians, ensures your devices continue to function correctly and protect your water supply.

It is also essential to maintain and repair backflow prevention devices when necessary, addressing any issues identified during testing. A regular maintenance schedule, combined with prompt repair services from a professional plumbing provider, can help prolong the lifespan and effectiveness of your backflow prevention devices.

Partnering with a Reliable Plumbing Service

Working with a reliable plumbing service like John’s Plumbing & Drain Services is crucial for ensuring your Los Angeles home is protected against backflow risks. Our experienced technicians:

1. Assist with selecting and installing the appropriate backflow prevention devices for your specific needs and local regulations.

2. Provide certified backflow testing services, helping you stay compliant with local codes and guidelines.

3. Offer expert maintenance and repair services to keep your backflow prevention devices functioning optimally.


Backflow prevention is an essential aspect of protecting your Los Angeles home’s water supply from contamination. By understanding the causes and potential dangers of backflow and implementing proper backflow prevention devices, homeowners can mitigate the risks and ensure clean, safe water for their families. Regular testing and maintenance, combined with the assistance of a reliable plumbing service like John’s Plumbing & Drain Services, can help secure your home against backflow threats and maintain the highest water quality standards.
If you’re a Los Angeles homeowner concerned about backflow risks and want to ensure your property is protected by an efficient backflow prevention system, contact the expert team at John’s Plumbing & Drain Services today. Let us help you safeguard your home and maintain the highest water quality standards. Call our emergency plumber in Los Angeles today!

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Our water heater began spewing water this morning.  John was the first plumber in the area to answer my call, and was able to get to my house within 10 minutes of the call.  He fixed the problem promptly and for what seemed to be a reasonable price.  He was friendly and informative.  I will definitely call John again and will recommend him to neighbors.  Thanks, John!
-Caitlin R


John has done numerous plumbing projects around my house and has always done excellent work.  He's quick to respond to my inquiry's and even replaced my water heater on a Sunday.  Most recently, I had him install a water purification system and new faucet.  His prices are reasonable and he will continue to be my go-to plumber.
-Rachel R.

Very helpful guy, thank you for the quick service and low service fee 🙂 Job well done.
-Sandra F.


These guys are the best! If you're looking for a legit plumber, call John's Plumbing & Drain Services in Atwater Village. Fairest price, honest and very knowledgeable!
-Ashley C.

Project: Install a Tankless Water Heater System

Comments: john and company were very efficient. they took their time and got the job done right. they replaced my standard water heater with a rinnai tankless water heater. while they were here, I also had them install a earthquake shut-off valve. great job at a reasonable price. I am keeping john as our regular plumber for the future.
Sergio S. in La Crescenta, CA

Project: Install, Repair or Replace Plumbing or Fixtures

Comments: My tenant is happy so I am happy. John was very patient with me and explained everything before he did the job. Very nice over the phone and I will use him again for future plumbing needs.

 Marilyn L. in Pasadena, CA

Project: Install, Repair or Replace Plumbing or Fixtures

Comments: I am very pleased. I've had John do the top priority job of repairing a leaking drainpipe and his work looks to be top notch. I'm definitely thinking of using him for the larger job of repiping the whole house (replacing the failing M-type copper with L-type). And again, John's bid is within my budget considerations. Highly recommended.

Homeowner in Glendale, CA

Project: Install or Replace a Water Heater

Comments: John was great. He gave me options and worked with me to find a solution that worked within my budget. Very professional. I will definitely use him again for any plumbing issues.

Laura W. in South Pasadena, CA

Project: Install or Replace a Water Heater

Comments: John was very responsive to my initial call, showed upon time and did excellent work at a fair price to replace my water heater. I highly recommend him and I plan to use him for future plumbing needs

Gary P. in Sherman Oaks, CA

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Comments: We had them run a snake from our sewer line out to the street, as we have lots of trees with roots that sometimes get into the line. They came as scheduled, did a great job and the price was as quoted.

Colleen L. in Pasadena, CA


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John's Plumbing & Drain Services

3847 Brunswick Avenue, LA, Ca, 90039

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