Mattson Plumbing
Company Overview
Located in Discovery Bay, CA, Mattson Plumbing offers plumbing solutions throughout Discovery Bay and its surrounding areas. At Mattson Plumbing, we specialize in bathroom makeovers, water purification services, water heater setup and repair, drain clearing, drain leak fixes, and more plumbing solutions. Our goal at Mattson Plumbing Co. is to offer top-notch service at an affordable rate for all our customers. Our team consists of skilled professionals with extensive experience in the field. We attribute our company's success to the unwavering commitment we show to our customers. Customer satisfaction remains our foremost priority, regardless of the job at hand. For emergency plumbing needs, we are here to provide support. Contact us now for a free estimate. I spent years working with some of the best plumbing companies in the country before deciding to start my own venture, and I have been growing it ever since. For the last few years, I have worked alongside top plumbing companies to support their expansion and development. These firms experienced growth, leading to happy staff and satisfied clients. At Mattson Plumbing Co., our key focus is to ensure every client enjoys a positive experience, leaving with smiles on their faces. We handle all plumbing requirements, including water heaters, sewer lines, repiping, gas line installations, and leak detection. Contact us to arrange for one of our talented technicians to conduct a home assessment.
Business Services
- Bathroom remodeling
- Bathtub installation
- Bathtub repair
- Drain installation
- Drain repair
- Faucet installation
- Faucet repair
- Garbage disposal installation
- Garbage disposal repair
- Gas line installation
- Gas line repair
- Hot water recirculation pump installation
- Hot water recirculation pump repair
- Kitchen remodeling
- New structure construction
- Plumbing inspection
- Plumbing installation or replacement
- Plumbing repair
- Pool installation
- Remodeling
- Sewer installation
- Sewer repair
- Shower installation
- Shower repair
- Sink installation
- Sink repair
- Sump pump installation
- Toilet installation
- Toilet repair
- Water heater installation
- Water heater repair
- Water pipe installation
- Water pipe repair
Business Location & Hours
Mon: | 9:00 AM - 5:00 PM |
Tue: | 9:00 AM - 5:00 PM |
Wed: | 9:00 AM - 5:00 PM |
Thu: | 9:00 AM - 5:00 PM |
Fri: | 9:00 AM - 5:00 PM |
Sat: | 9:00 AM - 4:00 PM |
Sun: | Closed |
Recommended Customer Reviews

RJ came out and looked at the issue we were having, then consulted with us on a few other items, giving us options to look at for a new system, while pointing out the last plumbing service did not install a pipe up to code - which caused rust to back-flow into the unit, burning out the motor. We immediately called the previous plumbing service and they replaced the pipe and installed a new safe one up to code with no charge. RJ's professionalism and willingness to help in all areas before even hiring him was above and beyond.

Great service today installing our double Sink Faucets!
They made an appointment and kept us up to date on arrival time!
Two young men arrived and worked quickly and professionally to install our two Sink Faucets!
They cleaned up the work area checked for leaks and left!
We we're impressed with their professionalism and highly recommend Mattson for your heating
Needs!

Rj came out late to fix a pipe leak that forced us to turn our water off. We thought we were gonna go the night with no showers or any other water amenity . RJ saved the day and his emergency service call fee was more than reasonable

excellent time response, customer service a++ and way more affordable than any other plumber in our area.
my two toilet's kept backing up a few different times about 2 months apart. i called mattson plumbing, spoke with rj, and he and another guy came out and ran a cable & camera and found that the clean out line was pretty backed up due to blockage and a cracked pipe. repaired & cleaned out and betteryet, no more blockage! rj was extremely communicative and professional. overall time frame took about a week after everything was said and done, but thats because we had to wait to rent the camera needed for this repair which i was perfectly fine with. i have called (and will continue to call) mattson plumbing for everything i'll need in the future.
reading some of these negative reviews doesn't seem realistic. rj worked diligently and was more than fair with his pricing. we all have to realize that no matter who we utilize, inflation has hit everyone, everywhere. please be understanding that smaller business are majorly affected as well, but they (in my opinion) do the best work in my opinion.
overall, i am very, very satisfied with rj & mattson plumbing

I contacted RJ with Mattson Plumbing on 05/04 to take a look at a sink in our primary bath and I scheduled an appointment for them to come out on 05/09 to assess the situation. The guy who came to our house was great! On 05/10, I received a text from RJ about the services that were being recommended and we scheduled an appointment for the work to be done on the afternoon of 05/17. About 40 minutes prior to the scheduled arrival time on 05/17, I received a text that their schedule was running behind for the day (totally get it - it happens!) and we rescheduled for today with an arrival time between 10:00-11:00am. At 11:08am, I sent a text that read, ""Hey! Just checking in on timing?"" and got no response. At 11:30am, I called and left a voicemail and got no response. I'm disappointed at the lack of professionalism and that my time wasn't considered of value.

Amateur. Amateur on his skill, amateur on his word, amateur on his professionalism, and amateur on his accountability. If you have the courage to hire this company, pray that the job is easy and turns out perfect because dealing with him afterward will be a hassle.
Issue #1: A trusted contractor referred him to demo and install a new shower valve in the bathroom I was remodeling. Once the job was done, he was given a check for the job, and I asked him to give me a bid for the work done so I had it for my records. I continued to ask several times, and over six weeks later, I still don't have it.
Issue #2: After he finished the job (and already having lost my trust and respect for having failed to provide me with the bid), I called in a plumbing foreman I trust to finish the job he started and install the fixtures. While here the foreman brought to my attention that RJ did not strap the handheld piping (see photo) for the new shower. And that's after the 5K tile job was finished. I know, I should have had someone review his work afterward, but how would I've known of his amateur skills...
Since I did not want to cut corners on the job, I immediately contacted RJ and told him he needed to come back in, get behind the wall and do the job right. He came back in, met with my title guy (who, understandably, wanted to avoid breaking into the tile work), and they both opened two different cuts on the drywall to see if RJ could get back there to strap the piping. The first hole was done next to the tile work on the wall behind where the toilet was going back in. He decided he couldn't fit.He then suggested breaking the wall above the tile work (8 feet high). He still wasn't able to go through. So I had to SETTLE for him, just caulking the handheld instead. While there, he admitted his mistake of not strapping the pipe but made no apologies for the inconvenience caused.
Before leaving, I ensured he knew he was responsible for the damage (it cost me $200 to have it fixed), and he went, ""Call me later, and we'll figure it out.""
I texted and called him several times during a 10-day period, and nothing. Crickets. He even ignored the GC who referred him to my house. Then I decided to finally call him on his BS via text, to which he responded. We went back and forth for a few minutes, and he continued to act as if he did nothing wrong (despite having admitted himself on site). At that point I decided to just leave it alone because $200 isn't worth the negativity of dealing with unethical and unaccountable professionals.
It's mindblowing that somehow he thinks I'm responsible for the damage done during the process he led to try and fix his incomplete job in the first place!
Issue #3: While doing the job on the first day, RJ pointed out that one of my newly installed faucets was faulty as the cold water pressure was weak. He suggested I go in and purchase a new one, which I did. However, when the foreman mentioned above was over to install the fixtures, I brought this to his attention.
Apparently, all he had to do was look under the sink and untangle the cold water faucet connector to release the pressure. Imagine that! The guy told me to spend another $130 on a new faucet without taking the time to bend over and look under the sink. Stay away.

RJ from Mattson plumbing installed my water heater in 2022. RJ refused to send a receipt for the work even after repeated requests (he just kept promising to send tomorrow and then stopped responding altogether).
NOTE TO OTHERS: please make sure to get a paid receipt from him before making any payment.
The water heater had a leak less than one year after install. After many requests, he finally came to take a look. He initially misdiagnosed the issue, then later said that he needed some parts, then took weeks to reach out to the manufacturer. The manufacturer shipped some parts overnight, which RJ finally installed, but this didn't resolve the issue. RJ again stopped picking up the phone and stopped responding to any texts.
The unit was still under warranty, but he wanted us to pay $500 for service. Note that the issue wasn't fixed and his work order clearly mentioned that he provides 2 years of Warranty on install, and unit has its own warranty. I agreed to paying that but requested a receipt first, but he again used those deferral tactics saying send me the money first and he will send a receipt the next day. Looks like this is his standard practice, and he is doing something fraudulent by not officially reporting those earnings.
NOTE TO OTHERS: Please stay away from this company.
The unprofessionalism of this company has caused us significant pain (being without hot water for more than 3 weeks). He still refuses to send us a receipt for the water heater which we need for manufacturer warranty for further repairs.
IF ANYONE WANTS MORE FEEDBACK please feel free to reach out to me, I will be happy to share my experience with other users and hope to help them avoid suffering from this horrible company.

If I could give more than five stars I would! RJ and his team are amazing. I left a voice mail on late Friday night and RJ had gotten back to me within the hour. we had an appointment set and him and his team came out to take care of our situation. RJ is so professional and friendly. walked us through everything that needed to be done and exactly what they were going to do to fix it. I will definitely be using them for any plumber issues or projects we may have in the future!!

RJ and his team arrived first thing this morning and resolved our water valves shut off issue. The workmanship was way above par and excellent. We would highly recommend them to resolve your plumbing issues.

I called RJ for a non emergency plumbing issue. He came out the next day diagnosed the problem and fixed it! Awesome job!!!