VERIFIED THE BEST! The City of Mercer Island sent notice that we needed a backflow test. The notice included 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! read more

I've been using 5 Star Backflow Services for my required city backflow inspections for years now and 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! read more

Been using 5 Star for few years for winterization of our irrigation system as well as the backflow testing. They're very courteous and responsive to communication. Their fees are competitive as well. Highly recommended. read more

Contacted 5 Star Backflow Services after the company we had used for many years ghosted us. Josh got back to me within an hour, and scheduled the inspection for a week later. Domenic, the tester, was competent, friendly, and efficient, and it was all completed in less than ten minutes at a really fair price. Couldn't be happier. read more

Needed a Backflow testing and was able to do in a quick turnaround. Was priced reasonably.

Have been with Josh for the third year now. The team is responsive, moving fast and professional.

I made an appointment with Josh. The appointment was over two weeks out. I texted him my information from City of Kirkland as he requested. He texted me back an inconsequential question that I missed and didn't respond to immediately. Instead of pursuing the answer, he cancelled my appointment and didn't schedule a new one. Very strange and troubling behavior to a new customer. Big red flag. Also- ProTip: don't run your business over text messaging. read more

Agreed to service. Gave a wide window between 10-1. No call ahead of time. From the time he rang the bell to pulling car out of our driveway, he waited all of 2 mins. Looks like they are too busy for new business. Just texted me saying "Sorry, nobody home. Got to go". No offer to reschedule, no courtesy call. He also told me he assumes there is no one at home if you don't answer the door within 2 mins. Going to be looking for other providers. read more

Fast, responsive and affordable! As a first time homeowner, this really really saved me a lot of trouble and money!

Highly recommend. We just completed another annual batch of backflow prevention device testing in our Kirkland condo complex with Josh from 5 Star. Super friendly, well priced, organized & easy to work with. We've been happy with 5 Star's services for many years now. read more

Requested a quote through Yelp, for our annual backflow testing at our house and he was the quickest of 3 to respond. Communication was prompt and professional and scheduling was easy. He arrived on time and later that evening he emailed/submitted the results to the City and CC'ed me to have as a record. Price was fair and will be using again next year. read more

Excellent service, great communication and affordable. Would recommend! He came around my schedule and was done in less than 10 minutes.

Thank you Joshua for going above and beyond to help me with my backflow mess. Whoever installed my backflow system had placed cinder blocks underneath and obstructed the ability for access. After digging for hours and actually damaging the pipe Joshua is more than helpful and instructing us how to repair.. What would have cost us $600 only took us time and energy.. and a few dollars for hardware store supplies. After the pipes were fixed the back flow system reinstalled Joshua came out for a second time to test the backflow.change the filters made the necessary repairs cuz it failed the first time, submitted the paperwork and now I'm good to go for a year. He was also able to contact the water district that was requiring this process now as they did not issue me the number associated with my property. Thank you sir for what you've done I'll be sure to contact you next year for my next required test.. I've already passed his number on to my neighbor who also is in need..I will also post his number on my neighborhood watch for all those who might need to get theirs done as we have all received this notice.. read more

Josh is professional in his field and very polite. I highly recommend him to check backflow!

Josh is terrific!! He's prompt, kind and efficient....our 'go to' guy for Backflow testing.

I have been using 5 star Backflow Services for several years, they make it easy, reliable and make sure the city has the info right away.

Josh has been my go-to guy for backflow service for years, and I've always appreciated his prompt and friendly service. Before relying on Josh, I tried a couple different backflow testing services, and I can honestly say that Josh goes above and beyond. When a problem arises, he diagnoses the problem and tries to fix it rather than just submitting the failing test. I also appreciate our annual chats which makes the annual testing process more enjoyable. read more

I should have written this review years ago. Josh has been helping me on two properties for backflow tests and winterizing my house's sprinkler system always with excellent service and reasonable pricing. His wife, Leslie, who handles scheduling is way organized. read more

Clear communication, on time, friendly and professional. Would definitely recommend his service.

Update 3/17: So the good news is someone came and fixed our valve. Scott, who fixed it, said that whoever serviced it before left one of the test valves open on accident. I thought it was Josh but it turns out it was the person who did our backflow the year after Josh when I was out of the country. My wife and I got mixed up on dates so I would reiterate Josh is friendly and great at what he does. I feel bad about thinking he was the one who messed up our sprinkler, it was another company! read more

I had the great pleasure of running into Josh while he was in our area performing an annual backflow test for another customer. I mentioned that we had had difficulty scheduling a time with an approved contractor during the City's mandated window for inspection, but had not yet tried 5-Star Backflow. Josh mentioned he had an opening and would be able to swing by our home later in the day. He dropped by, performed our test rapidly, and gave some recommendations on some questions we have with our current system. His experience, professionalism, and willingness to rapidly help out a new customer were both incredibly appreciated and speak volumes. It's always a pleasure to find folks that take personal pride in their business. Josh could have been anyone on the team, a tech, a new hire, a foreman, etc. I looked his business up later and was happy to see 5-Star is family owned and operated by Josh's family. When it comes to backflow testing and expertise it'll be an easy choice for me to give 5-Star Backflow a call in the future. read more

Prompt, friendly, and professional communication. Arrived as scheduled. He submitted the backflow report for me, the water district confirmed receipt. Everything went smooth. Recommended. read more

If I could give them 0 stars I would as Josh didn't perform annual backflow testing as scheduled. I scheduled an appointment for today in early January so I have been waiting a few weeks to get the testing done. Josh apparently showed up today, couldn't find the backflow assembly using the description of the location on the notice from the city, and left without attempting to contact anyone or see if someone was home to help him find it. After he had already left, he sent an email saying he couldn't find the backflow assembly and to find it ourselves before he would come back. I'm not sure why he bothered to show up, leave, and then send multiple emails about it instead of just trying to contact someone while he was here. I only scheduled service with him because it was on the list provided by the city and I would not attempt to use him again. read more

Performed back flow testing required by my water company: fast, professional and fair price. Would recommend to anyone needing this service. I would use again. read more

This is about as easy as it gets. They take care of everything for you including sending the report to the city.

Im glad I found 5 Star Backflow. I would give 10 stars if it was possible. Detail oriented from start to finish. Excellent customer service. Great prices, the best in town. Thank you Leslie for taking care of both of my companies. read more

5 Star Backflow was excellent. Josh worked out an appointment time that fit my difficult schedule, arrived as promised, and was able to perform an unexpectedly needed repair to our backflow equipment. I'll be calling him again next year. Thanks, Josh! read more

Josh is professional, friendly, and able to schedule people in on short notice. We happened to be out of town on the date he had available, but he was still extremely prompt in submitting the backflow report, and the invoice system was smooth. Highly recommended for all your backflow needs. read more

I recently used their service to check my backflow system, and I was impressed with their customer service. Josh give me fast and helpful feedback every time, and when he came to my home, he suggested me honestly how to deal with a problem. He was kind, professional, and reliable. Strongly recommend! read more

Responded quickly. Scheduling was easy. Prices are great. Documentation of the test result was emailed to me and the utility district same day. I couldn't have asked for anything better. I will definitely contact Josh again next time I need a backflow test. read more

Josh handled our backflow services for the City of Bellevue. He took care of all the paperwork and made the process quick, easy and straightforward. I had a question for him on another item relating to our water system and even though he wasn't making any money, he talked me through the problem so I was able to easily fix it. I highly recommend these guys. read more

Josh (5 Star Backflow Services) is fantastic! This is our second year in a row using this company for the city mandated annual backflow testing and we've been extremely happy with the service both times. Josh has been prompt, professional and a pleasure to work with. This year, we had some issues with our shut-off valve being EXTREMELY tight and Josh spent quite a bit of time and effort, including driving to a hardware store to get a necessary part, to get the issue resolved for us. He really went above and beyond to help us and we can't thank him enough for that. Definitely use this company for any of your backflow needs!! read more

I messaged Josh today and was in need of a backflow testing (an area which is desperate for attention). We no longer live in the home in Seattle so the appointment requires a bit of coordination with tenants. To my surprise, Josh jumped in and replied right away. He offered me some times and I was able to secure an appointment before my testing deadline. My tenant was able to connect to him with ease. Hey! I look forward to seeing the result and it's the first time I look forward to getting an invoice from someone. Thank You! read more

I left Josh a message on Yelp for a backflow test and he got back to me right away. He was willing to work out a schedule with me and got the job done so quickly. He also sent the report within 2 hours of leaving my house. Very efficient and professional. Couldn't be happier with his service and would give him more stars if I could! read more

Never had to have my backflow tested before. Received my notice in the mail. Called Josh first and he was out within two days. Easy to work with. Would recommend to any friends or neighbors. read more

Josh is just an awesome professional! I contacted him about the sprinkler system leak, and twenty minutes later he is in front of my house investigating! We had severe leak, our HOA said it'll cost us $1000 to replace it (I was shocked) and they didn't even stop the leak. But Josh came in, stopped the leak with just a screw driver, and saved us tons of money. He was even trying not to charge me, so I had to force him to charge me something. Josh is very honest man who tries to help you as much as he can, suggest you what could be done better, will tell you his tips, he just truly cares! He tries to solve the problem asap and get 100% customer satisfaction. Even weeks later he tries to check back and see if Im not having any problem. I still might have other problems around the backpressure, and he is the number person to contact! I highly recommend anybody. Im sure even if he can't solve it himself, he'll still try to point you in the right direction! Good luck to you Josh, in your business! read more

Josh with 5 Star Backflow Seevices was very pleasent to work with. He gave me a date over the phone and I was out of town but he was able to complete the work without any inconvenience to me and mailed the report to my utility company. Now I just have to write him a check. Price was very reasonable and I will continue to use him each year. Thanks again! read more

Super-friendly and helpful. Very patient with all my questions! I highly recommend them.

Josh wasn't able to do the work I needed but called me back and referred me to another source within a couple of hours!

Just another annual update and recommendation to call Josh for your backflow testing. Responsive, shows up when he says he will, files paperwork with the water district same day, and the best price. read more