Serving New Hampshire Since 1992
Everything Your Home’s Water Needs
Plumbing, well or water quality problems? Mainline has the solution.
About Mainline
We’re More Than Plumbers. We’re Water Experts.
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.
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30+ Years Serving Southern NH
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Third-Generation Plumbing Experience
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Plumbing, Wells & Water Treatment
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Licensed & Experienced Professionals
Trustindex verifies that the original source of the review is Google.
I woke to a flooded first floor from an expander tank that may have been leaking for days. I had no hot water so went down to look into my furnace room and I had possibly over 2 inches of water running out of the furnace room down a hall, into another room and even under my washer and dryer into my garage. Knowing Mainline Plumbing from previous years, I called them immediately. I believe they were at my house within 45 minutes the latest. After taking maybe 2 minutes, unfortunately for me, the new was not good. I was on borrowed time with my furnace. To make a long story short, Mainline gave me a quote, told me what had to be done, how they would do it and most importantly when they could start it. All their answers were what I needed to hear so that I would have heat, hot water and peace of mind. They actually started that afternoon bringing in some of the pieces of the new equipment they were going to be installing. Let me say this was the Friday of the long weekend. John, the owner, looked at his crew and asked who wanted to work this weekend? Not one of them said no to his question. They worked until Sunday maybe mid-morning and I was back with hot water and heat and sanity!! They were in constant touch with me as I had to go away overnight. I never worried about his team being in my house without me. I knew when they were coming, what they had done while at the house and when they were leaving. I needed help with my Nest that Monday morning (which was the holiday) and they were there straightening it out for me maybe 20 minutes after I asked for help. I cannot tell you everything that they did, but I can tell you that I would recommend Mainline in a heartbeat to anyone that needed service with what they do.Posted on Google![]()
Sue Boppel1 days agoTrustindex verifies that the original source of the review is Google.
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.Posted on Google![]()
Carl DePrima2 days agoTrustindex verifies that the original source of the review is Google.
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!Posted on Google![]()
Phillip Michalowski4 days agoTrustindex verifies that the original source of the review is Google.
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.Posted on Google![]()
Deb Racca8 days agoTrustindex verifies that the original source of the review is Google.
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.Posted on Google![]()
Peter P12 days agoTrustindex verifies that the original source of the review is Google.
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.Posted on Google![]()
Steve Bee13 days agoTrustindex verifies that the original source of the review is Google.
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.Posted on Google![]()
Michatch14 days agoTrustindex verifies that the original source of the review is Google.
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.Posted on Google![]()
Cheryl Remsburg16 days agoTrustindex verifies that the original source of the review is Google.
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!Posted on Google![]()
Barb Brunelle16 days agoTrustindex verifies that the original source of the review is Google.
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!Posted on Google![]()
Meg Bamberg20 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

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.

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.

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.

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!
to You PFAS Filtration System!
As the original state-approved PFAS filtration vendor, Mainline helps eligible homeowners access funding for whole-home filtration.
Water Wisdom
Water Answers From the Experts
Helpful answers about water quality, wells, plumbing and the issues affecting New Hampshire homeowners.