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5.0 from 152 Google reviews · Sep 30
Mr. Backflow is a Christian, family-owned backflow prevention company proudly serving Carlsbad, Encinitas, Vista, San Marcos, Rancho Santa Fe, and surrounding areas in North San Diego County. We specialize in certified backflow testing, annual backflow testing, backflow repair, backflow preventer replacement, backflow cage installations, upgraded backflow assemblies, and new backflow preventer installations for residential and commercial properties.
With a commitment to honest, reliable service, our certified backflow testers protect your water systems from contamination, cross-connection hazards, and ensure full compliance with local water authority requirements and plumbing codes.
License covers C-36 Plumbing.
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Google · Sep 30, 2026
Newest review Sep 12, 2026 · 10 or more reviews in the last 3 months (as of Oct 10, 2026)
Newest reviews on GoogleWord for word · read Oct 10, 2026
Outstanding service
Very professional
Thank you Marc,
We take great pride in delivering work that not only meets code and district requirements, but also reflects the craftsmanship and reliability that Mr. Backflow is known for. Your feedback reinforces exactly why we do what we do.
Thank you again for trusting us with your property — we’re always here for you.
> Mr. Backflow Team
Liam went above and beyond to help us out! We had been quoted nearly $9,000 by another plumbing company for a replacement that turned out to be completely unnecessary. The previous plumbing company had also left our building with an illegal bypass in place.
Liam took the time to explain everything to us and was incredibly informative, honest, and thorough. After inspecting the system, he determined that we simply needed to refurbish our existing backflow rather than replace it, since these systems can have a lifespan of around 25 years.
He took care of everything that day and was able to come back and install it the next morning. After dealing with multiple companies and getting completely different answers, it was such a relief to work with someone who was knowledgeable, honest, and wasn't trying to sell us something we didn't need. We really appreciate Liam and would absolutely recommend him!
Thank you so much, Miquela! We’re really grateful for your kind words. And hey — anytime we can save someone from a $9,000 “surprise,” that’s a good day in the backflow world.
I’m glad we could get everything inspected, refurbished, and back in compliance without replacing a perfectly good system. Honesty and clear explanations are part of the job… but leaving you without an illegal bypass is the real bonus.
It was a pleasure helping you out, and we truly appreciate the recommendation. If anything ever acts up again, you know who’s got your back(flow).
— Mr. Backflow Team 💧
They made the process incredibly easy and they were able to complete the service same day!
Thank you, Michael! We’re really glad to hear the process felt easy on your end — that’s exactly what we aim for. Same‑day service can make a big difference, so we’re happy we could jump on it and get everything taken care of right away.
We appreciate you choosing Mr. Backflow and are here anytime you need us again.
— Mr. Backflow Team 💧
Great service: quality, follow up, cleanliness, etc
Had been experiencing high water pressure issues
We’re really glad to hear you had a great experience with our team. Quality work, clear follow‑up, and leaving everything clean are standards we take seriously, so it’s awesome to know it showed. High water pressure issues can be frustrating — glad we were able to get everything dialed in for you.
We appreciate you choosing Mr. Backflow and are always here if you need anything in the future.
— Mr. Backflow Team 💧
Liam is a pro. He did a perfect job. Definitly recommend to all my friends. Thank you.
Thank you so much, George! Really appreciate the kind words. We are glad the job came out perfect and that you felt good about the price. It means a lot that you’d recommend us to your friends — always here to help whenever you need anything.
> Mr. Backflow Team 💧🙌
Fast response, showed up on time, knocked out the job quick. Will use again.
Thank you so much, Jason!
We really appreciate the 5‑star review. Glad we could get out there quickly, show up on time, and knock out the job without any hassle — that’s exactly what we aim for every day.
Thanks for choosing Mr. Backflow, and we’ll be here whenever you need us again! 💧🙌
— The Mr. Backflow Team
Highly recommend Mr.Blackflow. Needed my backflow replaced and they came out and did it asap. Great pricing and great team. 👍🏼
Thanks Ayden, we’re thrilled Mr. Blackflow replaced your backflow quickly and at a great price.
We appreciate the recommendation and look forward to helping you again.
Mr. Backflow (Liam Lark)did an Excellent job replacing our Backflow unit, right on schedule, very reasonable price!
Thanks so much, Wes! We're thrilled the backflow replacement went smoothly and stayed on schedule.
We appreciate you trusting us and are glad you’re part of the crew.
Our experience was outstanding: After a left initial VM requesting to schedule appt for repair, Liam (owner) himself called to "prescreen" what issue was. AMAZING! Appt scheduled next day, leak repaired, price seemed appropriate, invoice emailed - technician filled out water dept required form & dropped it off himself!! All smooth & professional from start to finish.
Thank you, Mr Backflow, for great service & for your courtesy!!
Thanks, Gay, we're thrilled you had an outstanding experience!
We appreciate you trusting us and your kind words; they mean a lot to the whole team.
1 of the newest 10 is a rating without text.
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Google Maps · Sep 30, 2026 · 106 photos on the listing.
Original Google source ↗How ratings are listedCSLB #1117220. C-36 Plumbing: water and gas lines, water heaters, gas appliance hookups, drains and waste lines. Licensed since Feb 28, 2024: 2 years. Expires Feb 29, 2028. The class should match your job.
Open CSLB record ↗Read Oct 14, 2026Bond with AMERICAN CONTRACTORS INDEMNITY COMPANY since Feb 19, 2024: the $25,000 bond every California contractor must carry. A bond is separate from liability insurance.
Open CSLB record ↗Read Oct 14, 2026The business told CSLB it has no employees. An exemption isn’t insurance: CSLB warns that if a worker is injured on your property and the contractor has no insurance, you could be financially liable. Ask who will do the work.
Open CSLB record ↗Read Oct 14, 2026CSDP doesn’t read liability insurance. Ask the business for a current certificate that covers your job.
CSLB · status changes between these dates aren't shown
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Google Business Profile · Sep 30, 2026 · CSLB record
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