Mainline Plumbing - Plumbing services in Londonderry

Plumbing

Mainline Plumbing

Your Water Is Our Business

5 (574)

Our Story

Mainline Plumbing is a family-owned and operated business serving Londonderry, NH and surrounding areas since 1992 with trusted plumbing solutions. Their highly-trained team of licensed plumbers and apprentices specializes in well pumps, water filtration, treatment, and water heaters to ensure clean, safe water for homeowners. They address contaminants like PFAS, arsenic, radon, uranium, and bacteria, and offer whole-home water softeners for hard water issues. As a vendor for New Hampshire's rebate program, they provide free whole-house drinking systems to qualified customers.

Our Specialties

Well Pump Maintenance & RepairsWater Filtration & TreatmentPFAS FiltrationWater Heater Installation, Repairs & MaintenanceConstant Water Pressure SystemsPlumbing ServicesWhole-Home Water SoftenersResidential Water Purification

Services

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Service Area

Based in Londonderry, NH

Serves within 30 minutes drive from Londonderry

Client Reviews

5.0 from 574 reviews on Google

I called Mainline hoping to get some answers on an outdated and out of code hot water system. John came out same day and walked through my options with me. The next day, John's team came out and had a brand new water heater and all new piping installed in just a few hours! No more polybutylene!! I would recommend this company for anyone in need of plumbing help.

Jacob Madden a week ago

We have used Mainline a number of times. Most recently we worked with John, Mike and Justice on the installation of a new well pump and home water filtration system. They were quick to evaluate our issue, offered reasonable pricing, and explained everything that needed to be done. They could not have been more professional and easy to work with. I highly recommend using Mainline for all your plumbing needs!

Melissa Marcotte 2 weeks ago

Conner and George were exceptional! They came in with everything they needed, and cleaned up afterwards! They were able to help fix our plumbing issues very fast, and when they noticed how hard our water was they were able to test it on the spot! They were able to explain what they found, and I understood what they were saying.. They are a wonderful company and we highly recommend them! Thanks for providing wonderful service!

Ariel Cairns 2 months ago
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Common Questions

Mainline Plumbing serves Londonderry, NH, and the surrounding areas in southern New Hampshire. Our team of licensed NH Master Plumbers and state-approved apprentices provides reliable well pump maintenance, repairs, and water filtration solutions throughout this region. Whether you're dealing with low water pressure or contaminants like PFAS, we ensure prompt service in your local area.
Since 1992, Mainline Plumbing has been a trusted family-owned business specializing in well pump maintenance and repairs in Londonderry and surrounding areas. Our highly trained professionals, including licensed NH Pump Installers, handle everything from constant water pressure systems to troubleshooting no-water issues. With over three decades of experience, we deliver exceptional results for residential well systems.
Yes, Mainline Plumbing specializes in PFAS filtration and comprehensive water treatment services to remove contaminants such as per- and polyfluoroalkyl substances, arsenic, radon, uranium, and bacteria from your home's water supply. We provide high-quality whole-home water softener solutions and filtration systems designed for safe, clean drinking water. As a vendor for the state of New Hampshire’s rebate program, qualified homeowners may receive a whole-house drinking system at no cost, with over 100 installations completed since 2023.
Mainline Plumbing offers installation, repairs, and maintenance for a variety of water heaters, including traditional tanked gas and electric models as well as on-demand tankless units. Our experienced team ensures your system meets all current codes and provides reliable hot water when you need it. If you're experiencing no hot water or require routine servicing, we handle it efficiently to restore functionality.
Mainline Plumbing is proud to be a vendor for the state of New Hampshire’s rebate program, which allows qualified homeowners to receive a whole-house drinking water system at no cost. Since the beginning of 2023, we have installed free systems for over 100 customers, including PFAS filtration to ensure safe water. Our team guides you through the eligibility process, testing, installation, and reimbursement documentation.
To schedule plumbing repairs, water heater service, or well pump maintenance, contact us at (603) 472-5261 or use our online request form, specifying issues like no water, low pressure, or PFAS concerns. Our team, consisting of licensed NH Master Plumbers and Gas Fitters, will promptly assess your needs and provide a solution tailored to your residential system. We operate Monday through Friday from 6:00am to 6:30pm and Saturdays from 6:00am to 2:00pm, ensuring quick response times in Londonderry and surrounding areas.
As a progressive, family-owned business since 1992, Mainline Plumbing employs highly trained, licensed professionals committed to a drug-free workplace and exceptional service. We specialize in advanced water filtration for contaminants like PFAS and hard water issues using whole-home softeners and treatment systems. Our dedication is evidenced by participation in the NH rebate program and positive customer testimonials praising our efficient installations and reliable results.

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Londonderry, NH

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