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    A+ Backflow

    5.0 (4 reviews)
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    Services - A+ Backflow

    Plumbing inspection

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    1 year ago

    I have used A+ Backflow for probably 10 years. Very nice and dependable. Highly recommend.

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    10 years ago

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    10 years ago

    Dave is quick to reply, easy to work with, and gets the job done. Highly recommend! I plan to use his services for years to come.

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    8 years ago

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    5 Star Backflow Services

    5 Star Backflow Services

    4.7
    (47 reviews)

    VERIFIED THE BEST! The City of Mercer Island sent notice that we needed a backflow test. The notice…read moreincluded a list or 40 companies that were approved by the city. I loaded all 40 of them into my Claude AI program and asked the AI to tell me which one was the best. Which one had the highest ratings and had no bad feedback. It came back stating that 5 Star Backflow was the BEST of the 40 approved companies! I then called Josh, the owner of 5 Star Backflow, and he and his team worked around the clock to help me because I was up against a deadline. His communication with us was spectacular and thanks to him our water did not get cut off. We even had a complication with the backflow valve being broken, but he got it taken care of and he went way above and beyond to help us. I wish I could give him a 100 stars, because he is the real deal and he deserves a great review. If you need a backflow company, 5 Star Backflow is the absolute best! Thank you Josh!

    I've been using 5 Star Backflow Services for my required city backflow inspections for years now…read moreand I've always been happy with the service, so it's probably time for a review. Once they had me in their system, they started contacting me in advance to schedule the test each year, which I really appreciate since the city notice doesn't usually give a lot of turnaround time. This year the city surprised me by sending the notice a month early, and I was on vacation when the notice came. This left me with just over a week before it was due. I contacted 5 Star Backflow Services and they were able to do the test just a couple days later. After the test they always send the report directly to the city within 24 hours. I have been very pleased with the service. Thank you!

    Certified Backflow Testing

    Certified Backflow Testing

    1.3
    (3 reviews)

    While the field backflow testing service itself was adequate, the company's back-office operations…read moreare poorly managed and unacceptably disorganized. Their reminder system is not aligned with municipal requirements, and their billing and accounts receivable processes are fundamentally flawed. I was repeatedly told by staff that a prior invoice had not been paid, despite the fact that I retained written confirmation showing the payment was submitted through their Intuit QuickBooks link and acknowledged with a "thank you for your payment" email. Despite providing this documentation, the company unilaterally canceled a scheduled service appointment the day before it was to occur, citing non-payment. When confronted with proof, the explanation shifted to a claim that they "never received the funds from the credit card company," which is not a defensible position to place on a customer after confirming receipt. These outdated business practices, inconsistent internal communication, and lack of basic financial controls introduce unnecessary risk for clients. While I had initially intended to continue using this company, the operational failures and resulting service disruption make them unreliable and difficult to do business with. There are other providers who can deliver the same service with greater professionalism, transparency, and reliability, and I will be pursuing those alternatives going forward.

    I've been a customer of Certified Backflow Testing for nearly 20 years. I didn't leave over price…read moreor convenience. I left because of how they handled a mistake. After their technician serviced my backflow preventer this spring, my irrigation system stopped running. I didn't realize it right away. By the time I noticed, my lawn had already browned out and some plants were damaged. When I raised the issue, it took 2-3 weeks of back and forth to get nowhere. Certified Backflow didn't put the valve back to how they found it, which was in working condition. Their procedure states they restore valves to the position in which they are found, but they did not follow this procedure and won't take accountability for it. Management's first response was to hide behind policy rather than acknowledge what happened. They did send their GM out to look at the damage, which I appreciated. But even after seeing it firsthand, they couldn't provide any evidence that the technician left the shutoff valve in the correct position, and they offered nothing toward the damage caused. Mistakes happen. I get that. But after 20 years, I expected better. Finding a new provider.

    A+ Backflow - backflowservices - Updated August 2026

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