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Serving New Hampshire Since 1992

Everything
Your Home’s
Water Needs

Plumbing, well or water quality problems? Mainline has the solution.
Young girl filling glass with water from pump dispenser in kitchen.
About Mainline

We’re More Than Plumbers.
We’re Water Experts.

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When something goes wrong with your water, the cause isn’t always obvious. It could be your plumbing, well system or the water itself. Mainline has the experience to look at the whole picture, identify the problem and recommend the right solution.

  • 30+ Years Serving Southern NH
  • Third-Generation Plumbing Experience
  • Plumbing, Wells & Water Treatment
  • Licensed & Experienced Professionals
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Last Year Mainline Plumbing put in a Constant pressure water system installed. Work started and completed on time. Very pleased. RecentlyI had a problems with a leaky faucet and they provided me with a money saving suggestion. Rick came out in a timely fashion and repaired it. Very responsive and knowledgeable about plumbing.
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Carl DePrima profile picture
Carl DePrima
0 days ago
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I reached out to John from Mainline to help get a PFAS system installed for our home after looking into the rebate process for filtration systems. The install was fast, communication was great, and ultimately we were able to get the refund on the system fully funded by the state. While they were there- the team also installed a water softener, new filter, and fixed some issues with my boiler. The only real anxiety was related to the process of getting the rebate approved since it takes several weeks- but the majority of paperwork was handled through the Mainline team. Thanks again!
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Phillip Michalowski profile picture
Phillip Michalowski
2 days ago
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Two of my neighbors highly recommended Mainline Plumbing, and after having them complete our home project, I can understand why. They completed a full installation of a new Rinnai combination boiler and water heater system and a complete well water treatment and filtration system. Each component was installed carefully and integrated properly into our home’s water system. The entire job was completed with attention to detail, professionalism, and a strong focus on quality and proper operation. Mainline Plumbing did an excellent job from start to finish, and they clearly take pride in their work. I highly recommend Mainline Plumbing to anyone looking for reliable, professional plumbing and heating services.
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Deb Racca profile picture
Deb Racca
6 days ago
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Just moved into a new house and had water leaking from my washer hookup just hours before our machine was being delivered. John came in less than an hour and took care of it. Got upfront pricing so no surprises. Nice guy too. Would definitely hire again.
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Peter P profile picture
Peter P
10 days ago
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Got a filtration system installed a few years ago and had a few questions this week. The owner stopped by my home and answered all of my questions within minutes. Excellent services, both for the installation and the upkeep.
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Steve Bee profile picture
Steve Bee
11 days ago
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Connor And George were very professional and easy to talk to. They completed the job in a timely manner and left the work area clean. Very professional and great communication from the office! Thank you.
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Michatch profile picture
Michatch
12 days ago
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George did a great job and made some cool improvements I didn’t know about. He will be back for a new water filtration system to improve the water coming into the house.
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Cheryl Remsburg profile picture
Cheryl Remsburg
14 days ago
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We recently had Mainline Plumbing replace our well pump, and we couldn’t be more pleased with their service. They were efficient, knowledgeable, and professional from start to finish. We especially appreciated the different service options they provided and how helpful they were in explaining the differences, allowing us to make an informed decision based on our needs. They were also prompt in responding to our questions and inquiries, which made the entire process easy and stress-free. Excellent service and a great experience all around. I highly recommend Mainline Plumbing!
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Barb Brunelle profile picture
Barb Brunelle
14 days ago
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I had a wonderful experience from start to finish! They were incredibly easy to communicate with, always prompt and responsive, and extremely knowledgeable. I had a new water treatment system installed to address PFAS, hard water, and several other water quality concerns, and everything came out wonderfully. I really appreciated how much time they took to explain everything, answer my questions, and make sure I understood the system. Their in-depth knowledge and the care they put into the entire process really stood out. The installation went smoothly, everything was done professionally, and I couldn’t be happier with the experience. I would absolutely recommend them to everyone!
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Meg Bamberg profile picture
Meg Bamberg
18 days ago
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I started experiencing what seemed like lower water pressures in my home, even though the pressure gauge on my well tank didn’t seem to change. I called and was treated very courteously and efficiently by Autumn, who arranged to have John stop at my home that same morning to investigate. He found several problems in the plumbing involving my well tank (including a faulty gauge), informed me of what he felt were all the problems (and costs), and was willing and able to remediate the problems while present. Within a short period of time, I was reconnected to good water and pressures. The entire process was very smooth and comfortable. All of my concerns and questions were answered by either Autumn, who asked many questions about what I was experiencing and relayed that to John, or by John himself who took the time at the end of the repair to explain and assure. Very professional across the board! I would definitely recommend and will re-use these folks again when/if necessary.
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Keith Melaas profile picture
Keith Melaas
26 days ago
Our Services

Everything Water

From the well beneath your property to the water coming from your faucet, Mainline has your home covered.
Better Water Starts Here

Water Problems Aren’t One-Size-Fits-All

Technician installing a water filtration system in a basement.
1: TEST

Know What’s Really in Your Water

Clear water isn’t necessarily clean water. Professional testing can identify PFAS, arsenic, uranium, bacteria, hardness and other issues that may be affecting your home’s water.
Man operating a digital control panel in a warehouse setting, smiling and engaged with the device.
2: UNDERSTAND

Answers Without the Sales Pitch

We explain your results, what they mean for your home and the options available to you. No confusing jargon. No pushing equipment you don’t need.
Two technicians in Mainline shirts working on plumbing equipment in a basement.
3: SOLVE

Treatment Designed for Your Water

Every home’s water is different. We recommend treatment based on your actual water conditions, household and system rather than a one-size-fits-all package.
Worker operating a cable-pulling machine outdoors near a green area, on a sunny day.
4: ENJOY

Better Water Throughout Your Home

From cleaner drinking water to fewer stains, better pressure and reliable well performance, we’ll help keep your home’s water working the way it should.

Concerned About PFAS?

See If You Qualify For a No-Cost
to You
PFAS Filtration System!
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As the original state-approved PFAS filtration vendor, Mainline helps eligible homeowners access funding for whole-home filtration.
Dual water treatment tanks by Mainline Plumbing, featuring copper piping and protective covers in a utility room.