Abacus Plumbing, Air Conditioning & Electrical
2nd year as a Best Pick
certified company
Based on 646 reviews
Our Certification Process
Best Pick Guarantee
Verified License(s)
Verified General Liability Ins.
2nd year as a Best Pick Call
"Honesty and integrity are hallmarks of the Abacus business philosophy and are the foundation upon which the company was founded. 'You Can Count On Us' 24/7, including weekends and holidays. We look forward to providing you with extraordinary service."

Alan O'Neill | CEO
Company Information
Services Offered
Abacus specializes in clearing and cleaning stopped-up main drains and sewer lines. Abacus also offers video inspections for more serious issues that may be causing stoppages, such as bellies in the line or tree roots or shrub roots that can cause broken, ruptured pipes.
Services Not Offered
Abacus does not offer septic system work.
Company History
Abacus was founded in 2003. CEO Alan O'Neill has 39 years of plumbing experience.
The company was awarded the Best of Readers' Choice Award by Living Magazine.
Employee Information
Employees wear uniforms, drive marked vehicles, and undergo background checks and drug testing.
Areas Served
West Houston Suburbs, North Houston Suburbs, Fort Bend County & Southwest Houston, The Heights/Midtown
A selection of 646 homeowner reviews:
“Service was outstanding. Abacus explained what they were going to do and how they were doing it. They allowed me to observe. Successful outcome as well—A+.”
“The reason for choosing Abacus Plumbing is neatness, courtesy, and professional personnel. Jason's professional workmanship is second to none. Installation of the kitchen sink was perfect. From friendly individuals scheduling appointments to professional plumbers, Abacus is my first choice, and I pass on the good word to others—A+.”
“I was so impressed. The tech was on time, got it unclogged, and scheduled my camera inspection. The camera tech told me what I knew already—that everything looked great and was fine. I was so happy and will recommend and use them again—A+.”
“The service was excellent. I'll use Abacus for any future needs.”
“Abacus reviewed the options for repair versus replacing the main water line leading into the house. The work was completed as described with a minimum of disruption of the water supply. Work area was cleaned up, the ditch closed and the surface restored to its prior condition.”
“Very good work was done & was on time.”
“The tech did a very good job, the only thing he did not do was to stick a camera down to see.”
“Mateo Anaya came to my house on two different occasions. The second time, I asked for him if he was available. He obviously knew his job very well and was very personable and courteous, and always on time (which is mostly unheard of these days). He represents Abacus very well.”
“The technician was both knowledgeable and communicative.”
“You guys did a great job.”
“I'm satisfied.”
“Abacas provided prompt, courteous service to correct a clogged sink. I had them do a clean out to the street connection and have not had a repeat problem.”
“Did a good job on a messy project. Ruptured sewer line. Evaluated several approaches. Ended up with completely rerouted line from house to sewers. Cleaned afterward and we're very respectful of neighbor's property.”
“I have used Abacus for the past few years because of the good service they have always given me. I also recommend them to friends.”
“Like the service. Very prompt.”
“They're just very efficient and very swift in getting a service tech out when you call them. They unclogged a pipe in the back. They were a reference, and that is how I heard about them. I would give them an A for excellent work.”
“I liked that they were on time, and I liked the quality of the service—that's pretty much it in a nutshell. They did plumbing; I just had a clogged drain. I'd grade them an A.”
“They showed up on time, they were professional, they were knowledgeable, and they did what they were supposed to do. They did some inspections on sewer pipes. I've used them for quite a while. I'd definitely grade them as an A.”
“Abacus did an excellent job. I had an outside drain system, and it had collapsed because of tree roots. They dug it out and cleaned it up, and they were here immediately. I would give them an A because they did an exceptional job.”
“They are great, and they do very good work. They clean up very well and keep us well informed of what's going on and how they're doing. We have had no problems at all with them. They had to fix a sewer line, and they earned an A grade for their excellent work.”
“Abacus cleared a drain for me, and it was great. I liked the technician; he was full of information, and he gave me the background on what he was going to do and made sure that I was OK with everything. He was very good, and they have a very good reputation. I'd rate them as an A.”
“They identified the problem and took care of it. I had a blocked drainage pipe. It cost less than estimated, so that was a good thing. I would give them an A+.”
“The plumber from Abacus showed up on a Sunday to fix the problem. I called on a weekend, and when I called other plumbing companies, they were not available. Abacus unclogged the main sewer line that had been clogged up during the holidays. They were personally referred by a friend of mine. I would give them an A.”
“They came on time and did what they were supposed to, and they did a good, professional job. They cleared my drain and ran a camera down there so I knew what I was looking at. They were going to run their camera down there as part of the service, so that's why I wanted them. I would give them an A.”
“They cleaned out the drains. They did fine—it was a very good job. They did really good work, so they get an A.”
“They were well versed and went above and beyond for me.”
“We've always been very happy with all the work Abacus Plumbing has done for us. They typically do plumbing repair work for us, and we have been using the company for at least four or five years. I would give them an A+.”
“Abacus Plumbing unclogged a drain for me. This was the first time that I had used the company, but I would use them in the future and recommend them to others. I'll give them an A+.”
“I thought Abacus Plumbing did a good job. They seemed honest and up front, and they communicated well. I think they did a good job. They cleaned out a drain and unclogged it, so that's good. I would give them an A+.”
“Abacus Plumbing did some work for me. They cleaned out our sewer lines, and it was a good experience. The technician came out and told me exactly what it was going to cost, and he did the work. He was very nice and neat when he came in. It was actually outside my house for my sewer line that was plugged up. My pipe was backed up because of my outside line, so he had to get a machine. It's an older home, and he basically had to push all the debris and everything outside into the sewer system. It was an A+. I'd use them again.”
“Abacus Plumbing did some work for me in the past. They cleared out a clogged drain, and the quality of the work was excellent. I thought they were very professional. They came in, got the work done, and were gone. I was happy with the work. The technician was good and very professional. I would use the company again. I would give them an A+.”