One Flow Los Angeles Backflow Installation & Repair
Company Overview
Certified backflow preventer installation and repair experts serving corporate customers throughout the greater Los Angeles area, Ventura, and San Bernardino. We focus on fixing and installing failing backflow assemblies that protect the water supply. We are authorized plumbers, insured up to $2M. As AWWA certified backflow testers, we assist numerous residential and commercial properties across the Southern California region in managing their backflow systems. Our top priority is to keep your water service uninterrupted by local water authorities.
In the year 2015, One Flow L.A. started as an irrigation provider. As the company expanded, founder John Stoeckel explored ways to expand the business, leading to the launch of a backflow prevention division. When COVID-19 struck, John realized it was time to pivot entirely to backflow prevention. Since that time, One Flow L.A. has experienced significant success and has been dedicated in the fight to keep our water safe.
In my journey, I have been involved in the plumbing and irrigation industry. I was raised in the family business, but at the age of 21, I chose to start my own venture. I initially launched an irrigation service in Orange County, California. After a few years of steady progress, I was enthusiastic to seek out better opportunities. This curiosity, combined with a passion for water, led us to the backflow prevention industry. When COVID hit, we recognized it was time to dedicate ourselves to water safety. Since then, One Flow Los Angeles has established itself as a leader in backflow prevention.
Business Services
- Plumbing inspection
- Plumbing installation or replacement
- Plumbing repair
Business Location & Hours
Mon: | 7:00 AM - 8:00 PM |
Tue: | 7:00 AM - 8:00 PM |
Wed: | 7:00 AM - 8:00 PM |
Thu: | 7:00 AM - 8:00 PM |
Fri: | 7:00 AM - 8:00 PM |
Sat: | 9:00 AM - 5:00 PM |
Sun: | 9:00 AM - 5:00 PM |
Recommended Customer Reviews

John did a WONDERFUL job revamping our entire sprinkler system. He is experienced, knowledgeable, professional, personal, prompt and fair on his pricing. John communicates clearly and does what he says he will do on time and on budget. We couldn't be more pleased with his work, and highly recommend him to all of our friends and neighbors. Give him a call...you won't be disappointed!

Called John to come out to give me an estimate for a valve replacement. He came on time and provided me with a competitive quote. I moved forward with the replacement ($120 approx) for the type of valve I had. In and out about 40 min. It's been about 2 months and everything works as new. Will use him again if I need to.

John repaired our failing sprinkler station. He was friendly, professional, and did a great job. His card will go in my file for future sprinkler issues. Thank you John.

Had a bad leak recently one morning in the pvc pipe leading into a valve. Water was just flooding out and had to shut the water off to the house at the main. Called Orange County Sprinkler Service and spoke with John. He gave me a reasonable quote over the phone and had someone out within a few hours. Ishmael professionally and promptly made the needed repair and the bill was exactly what John had quoted on the phone. Two weeks later called John to come out to look at a few valves that were leaking and to get a repair estimate. John again provided a very reasonable quote and was very professional in making the required repairs. He worked hard, was very neat and did a quality job. I also inquired if he could install a separate shut off valve for the irrigation system so would not have to turn off the water at the main in the future. John dug down into the ground and found a irrigation system shut off valve that had been buried over the years. He replaced this valve and raised it to be above ground. The final bill came in a little under what he had quoted as he was able to use a few less parts. Found John to be very honest and professional and will use him again.

In fairness, John did work for me about a year ago. That being said, I told him I would leave a comment on Yelp but I soon forgot. I was cleaning my email box (John emailed me a receipt for his work) and I remembered our conversation. As it was, I had several broken sprinklers and my watering system was not working. I assumed at the time that I would have to replace everything, as it was older equipment and the last person I called told me it was not worth fixing and wanted to charge a lot of money to replace. Not only did John respond quickly, he was able to diagnose the problem with my sprinkler system so I did not have to replace it. He brought my system up to code, repaired my sprinklers and threw in a sprinkler tuneup on top of everything. His prices were far more reasonable than anyone else in the area. He was professional to tee and polite as well. I would use him again in a heartbeat.

Wow. Where do I start. My sprinkler system is over 10 years old and I have 7 zones. Noticed problems with the timer, flooding, and low pressure - planters dying and certain spots in lawn not receiving water. John came out and did a free assessment. Ended up installing a new timer, repairing a bunch of underground breakage points, repairing some wiring, replacing a bunch of broken sprinkler heads, and performing a tune up all around.
I would recommend John in a heart beat. He was professional and conscientious of my budget, walked me through my entire system (as well as giving me a quick lesson on a few things), and helped me determine what was critical and what can wait. He actually worked another day to finish the job and didn't nickel & dime me. He has very high work ethic and standards - you'll see it when he's on site working on your system while he provides periodic status updates and explains issues to you.
There are certain people/businesses that you trust and want in your rolodex. OC Sprinkler, John, is now my go-to guy for sprinkler service. It is my great pleasure to write this review.

I was very happy with the service I received from Orange County Sprinkler Repair. I had a soggy yard and high water bill. John returned my call promptly, identified the problem and repair quickly and answered all my questions. He was on hand to monitor the work. I recommend him.

OC Sprinkler Service was prompt, efficient, knowledgeable and seemed to charge a fair price.
We had a new system installed but without the right equipment. OC Sprinkler Service reconfigured the front and back yard. Thank you OC :)

John does great work. We highly recommend him. He is very detailed oriented and thorough and provides fast service.

What I liked about John, was he did all the repairs needed, while I was at work. I hired him over the phone, he gave me a quote and I said yes. When I got home, everything was perfect. Quick, reliable and fair.