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*The Angi rating for Water Softener Service companies in Londonderry, NH is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Water Softener Service needs.
*The HomeAdvisor rating for Water Softener Service companies in Londonderry, NH is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Water Softener Service needs.
Last update on December 15, 2025
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Environmental Testing & Research Laboratories, Inc
Environmental Testing & Research Laboratories, Inc
ETR Laboratories in an analytic laboratory with a broad range of commercial, industrial and individual clients. We provide analytic services using a wide variety of scientific methods including GC/MS, IC/MS, GIR, NMR and SEM equipment. We can do particle analysis, organic and inorganic chemical analysis and micro analysis on biological and other materials. Private water analysis is our specialty. Award winning. Additional DBA - Environmental Testing & Research Laboratories Inc, ETR Labs, ETR Laboratories.
"as advertised"
Nancy C on July 2018
ETR Laboratories in an analytic laboratory with a broad range of commercial, industrial and individual clients. We provide analytic services using a wide variety of scientific methods including GC/MS, IC/MS, GIR, NMR and SEM equipment. We can do particle analysis, organic and inorganic chemical analysis and micro analysis on biological and other materials. Private water analysis is our specialty. Award winning. Additional DBA - Environmental Testing & Research Laboratories Inc, ETR Labs, ETR Laboratories.
"as advertised"
Nancy C on July 2018

Extra Time Enterprises LLC Plumbing & Heating
Extra Time Enterprises LLC Plumbing & Heating
We accept all credit cards.
"Fixed two shower problems. One was linking and the other didn’t have enough hot water pressure. Jason was able to get a 29 year old shower stem unit replaced saving me hundreds of dollars on one bathroom. The second bathroom needed a water pressure adjustment again saving me hundreds of dollars."
Wallace B on October 2019
We accept all credit cards.
"Fixed two shower problems. One was linking and the other didn’t have enough hot water pressure. Jason was able to get a 29 year old shower stem unit replaced saving me hundreds of dollars on one bathroom. The second bathroom needed a water pressure adjustment again saving me hundreds of dollars."
Wallace B on October 2019

Main Stream Mechanical
Main Stream Mechanical
Main Stream Mechanical provides full spectrum plumbing, heating and air conditioning services. We also install and service whole-house generators and water filtration/purification systems. We are dedicated to providing reliable and cost effective solutions that best fit our customer's needs and expectations. As a National Grid VPI contractor, we specialize in converting oil customers to natural gas. Our techncians are expert, professional and responsive. They are licensed and hold industry certifications. We service and install natural gas, propane gas and oil equipment.
"Huge shout out to the crew at Main Stream Mechanical. Eric came out, reviewed my current system, and gave me his recommendation for replacing my furnace and hot water heater with a new, energy efficient furnace/hot water heater. Brenda, as always, was a pleasure to deal with. Answered all my emails and calls promptly and gave me all the information I needed in a timely manner. She even went out of her way to register my new furnace and provide me with all the information I needed to apply for my rebate! Nick and Marcus did a great job installing my new furnace/hot water heater. Both were very friendly and professional. Nick answered all my questions, gave me a “tutorial” on the emergency shut off procedure for my new furnace, and did a fantastic job re-plumbing all the lines needed for the install. I highly recommend Main Stream Mechanical for all your HVAC needs."
NormaJean F on July 2024
Main Stream Mechanical provides full spectrum plumbing, heating and air conditioning services. We also install and service whole-house generators and water filtration/purification systems. We are dedicated to providing reliable and cost effective solutions that best fit our customer's needs and expectations. As a National Grid VPI contractor, we specialize in converting oil customers to natural gas. Our techncians are expert, professional and responsive. They are licensed and hold industry certifications. We service and install natural gas, propane gas and oil equipment.
"Huge shout out to the crew at Main Stream Mechanical. Eric came out, reviewed my current system, and gave me his recommendation for replacing my furnace and hot water heater with a new, energy efficient furnace/hot water heater. Brenda, as always, was a pleasure to deal with. Answered all my emails and calls promptly and gave me all the information I needed in a timely manner. She even went out of her way to register my new furnace and provide me with all the information I needed to apply for my rebate! Nick and Marcus did a great job installing my new furnace/hot water heater. Both were very friendly and professional. Nick answered all my questions, gave me a “tutorial” on the emergency shut off procedure for my new furnace, and did a fantastic job re-plumbing all the lines needed for the install. I highly recommend Main Stream Mechanical for all your HVAC needs."
NormaJean F on July 2024

Artisan Plumbing & Heating
Artisan Plumbing & Heating
Keep your home running smoothly with top-quality heating and plumbing repair services from our master plumbing contractor in Merrimack,New Hampshire. Artisan Plumbing & Heating is the only name you need to know for expert plumbing and heating repair services at affordable prices. We do everything from installing and repairing water and gas pipes to repairing furnaces and maintaining heating systems. Since 1997 serving southern NH. licensed plumbing, heating, well water pump technician. 24 hour emergency service for our customers. We can try to schedule around hours that are the best for you. Emergency service for our customers is available.
"Job went as expected and they were able to do the job a day sooner than first communicated which was greatly appreciated."
Tom J on June 2020
Keep your home running smoothly with top-quality heating and plumbing repair services from our master plumbing contractor in Merrimack,New Hampshire. Artisan Plumbing & Heating is the only name you need to know for expert plumbing and heating repair services at affordable prices. We do everything from installing and repairing water and gas pipes to repairing furnaces and maintaining heating systems. Since 1997 serving southern NH. licensed plumbing, heating, well water pump technician. 24 hour emergency service for our customers. We can try to schedule around hours that are the best for you. Emergency service for our customers is available.
"Job went as expected and they were able to do the job a day sooner than first communicated which was greatly appreciated."
Tom J on June 2020

JMS Plumbing And Heating LLC
JMS Plumbing And Heating LLC
With jms plumbing and heating, you have over 20+ years of plumbing and heating experience that works to your advantage – quick, reliable and efficient service. This experience includes treating you and your home with respect, which is what we pride ourselves on. Many of our customers look to us as their preferred residential plumbing service provider. We enjoy our work and it shows! We look forward to welcoming you as a customer and being your preferred plumber in the future. licenses nh master plumber: 4923 ma journeyman plumber: 30110 nh gas fitter: gfe0804753.
"Great !!! He shows up when he says. Returns calls. Knows what he is doing. Polite & clean. Does great work at a fair cost."
Carl M on January 2021
With jms plumbing and heating, you have over 20+ years of plumbing and heating experience that works to your advantage – quick, reliable and efficient service. This experience includes treating you and your home with respect, which is what we pride ourselves on. Many of our customers look to us as their preferred residential plumbing service provider. We enjoy our work and it shows! We look forward to welcoming you as a customer and being your preferred plumber in the future. licenses nh master plumber: 4923 ma journeyman plumber: 30110 nh gas fitter: gfe0804753.
"Great !!! He shows up when he says. Returns calls. Knows what he is doing. Polite & clean. Does great work at a fair cost."
Carl M on January 2021

Paradigm Plumbing Heating & Air Conditioning Inc
Paradigm Plumbing Heating & Air Conditioning Inc
Paradigm Plumbing Heating & Air Conditioning, Inc. has over two decades of experience, offering a full array of services. We are independently owned. Our business is built on developing long-term relationships. We want to earn your business. We are the proud recipients the 2011 Hooksett Kiwanis Small Business of the year award, BBB 2009 Marketplace Ethics award and a long standing commitment to community involvement.
"Went great highly recommend this company"
Kenny K on February 2020
Paradigm Plumbing Heating & Air Conditioning, Inc. has over two decades of experience, offering a full array of services. We are independently owned. Our business is built on developing long-term relationships. We want to earn your business. We are the proud recipients the 2011 Hooksett Kiwanis Small Business of the year award, BBB 2009 Marketplace Ethics award and a long standing commitment to community involvement.
"Went great highly recommend this company"
Kenny K on February 2020

Coletta Radon Systems
Coletta Radon Systems
Coletta Radon Systems was founded by Robert Coletta in March of 2007. Our main goal is to protect you and your family from the harmful effects that radon exposure can have on the respiratory system. Coletta Radon Systems can improve your indoor air quality and guarantee to reduce the radon levels in your home. Coletta Radon Systems installs energy star radon fans, water treatment systems and high efficiency heating and cooling systems. Coletta Radon Systems uses the most current products to say up-to-date and maximize your energy savings. We offer AARST/NRPP certified technicians, guaranteed results, quality workmanship and reasonable rates. Coletta Radon Systems is fully licensed and insured. Coletta Radon Systems strives to ensure that radon levels are low and customers are happy. Call us today to schedule your appointment - (603) 401-3563 or visit us at www.colettaradonsystems.com
"Rob was easy to communicate with and we were satisfied with their work. Our radon levels plummeted as a result of the system installed."
Bonnie S on March 2019
Coletta Radon Systems was founded by Robert Coletta in March of 2007. Our main goal is to protect you and your family from the harmful effects that radon exposure can have on the respiratory system. Coletta Radon Systems can improve your indoor air quality and guarantee to reduce the radon levels in your home. Coletta Radon Systems installs energy star radon fans, water treatment systems and high efficiency heating and cooling systems. Coletta Radon Systems uses the most current products to say up-to-date and maximize your energy savings. We offer AARST/NRPP certified technicians, guaranteed results, quality workmanship and reasonable rates. Coletta Radon Systems is fully licensed and insured. Coletta Radon Systems strives to ensure that radon levels are low and customers are happy. Call us today to schedule your appointment - (603) 401-3563 or visit us at www.colettaradonsystems.com
"Rob was easy to communicate with and we were satisfied with their work. Our radon levels plummeted as a result of the system installed."
Bonnie S on March 2019

Advanced Radon Mitigation & Water Treatment
Advanced Radon Mitigation & Water Treatment
New Hampshire's Radon Removal and Water Treatment Specialists! Radon in your homes' Air or Water can have serious health implications. It is the number 1 cause of lung cancer in non-smoking adults. Radon is odorless and tasteless. The only way to know if it is there, and how much, is to test for it. Aside from solving the radon problem in your air and water, we can also design and install a water treatment system to remove a host of minerals and impurities from your drinking water. We have the right water filtration systems to remove iron and hydrogen sulfide gas before it enters your home for domestic use. We install State of the Art Water Softeners that will remove soluble metals and reduce the hardness in your water, which will make your water appliances perform better and last longer.
"Although my relationship with ARM started a bit rocky, in the end I was very happy with the service provided. After a ARM technician replaced a fan, the noise level in the surrounding rooms increased to a point where I wondered if I could sell the house. I got the impression from the technician who installed the fan and was told by another company's technician there probably wasn't anything I could do. But, Mike G, from ARM, was able to lower the noise to a tolerable level by reducing the vibration from the attached pipe by making small adjustments including re-positioning the fan, removing old clamps and adding foam. He patiently answered all my questions and explained what he was doing throughout the diagnostic. Although the noise problem was resolved, the radon level was still 10.8 pCi/L so ARM returned (with the original technician and Keith to add a second suction point. . I was very happy with their work. The pipes were placed in a way that is an unobtrusive as possible, are securely fastened and as I learned, have the right pitch. Before the installation, Keith explained what they did to determine where they thought the suction point should be, and after must have been a long day for them, made me feel it was important that all my questions were answered. My radon level is now .6 pCi/L! My only complaint is that it takes a long time to get appointments and for two of the visits they were a few hours late.. The cost of service is for the 3 visits which were 11/9/18, 12/26/18, and 1/30/19 and includes the cost of the fan."
Jill H on February 2019
New Hampshire's Radon Removal and Water Treatment Specialists! Radon in your homes' Air or Water can have serious health implications. It is the number 1 cause of lung cancer in non-smoking adults. Radon is odorless and tasteless. The only way to know if it is there, and how much, is to test for it. Aside from solving the radon problem in your air and water, we can also design and install a water treatment system to remove a host of minerals and impurities from your drinking water. We have the right water filtration systems to remove iron and hydrogen sulfide gas before it enters your home for domestic use. We install State of the Art Water Softeners that will remove soluble metals and reduce the hardness in your water, which will make your water appliances perform better and last longer.
"Although my relationship with ARM started a bit rocky, in the end I was very happy with the service provided. After a ARM technician replaced a fan, the noise level in the surrounding rooms increased to a point where I wondered if I could sell the house. I got the impression from the technician who installed the fan and was told by another company's technician there probably wasn't anything I could do. But, Mike G, from ARM, was able to lower the noise to a tolerable level by reducing the vibration from the attached pipe by making small adjustments including re-positioning the fan, removing old clamps and adding foam. He patiently answered all my questions and explained what he was doing throughout the diagnostic. Although the noise problem was resolved, the radon level was still 10.8 pCi/L so ARM returned (with the original technician and Keith to add a second suction point. . I was very happy with their work. The pipes were placed in a way that is an unobtrusive as possible, are securely fastened and as I learned, have the right pitch. Before the installation, Keith explained what they did to determine where they thought the suction point should be, and after must have been a long day for them, made me feel it was important that all my questions were answered. My radon level is now .6 pCi/L! My only complaint is that it takes a long time to get appointments and for two of the visits they were a few hours late.. The cost of service is for the 3 visits which were 11/9/18, 12/26/18, and 1/30/19 and includes the cost of the fan."
Jill H on February 2019

Jim Trombly Plumbing, Heating, & Cooling
Jim Trombly Plumbing, Heating, & Cooling
No matter what your plumbing, heating, or cooling needs, one call to Jim Trombly Plumbing is all it takes. Since 1967, Jim Trombly Plumbing, Heating & Cooling has been the plumbing & heating contractor that customers turn to again & again for top value and high quality plumbing service. With employees whose service spans decades with our company, we offer experience you can trust backed by a commitment to old fashioned service & value. No job – from a leaky toilet to designing & installing commercial plumbing & heating systems to multi-zone air conditioning systems– is out of our league. Our master plumbers are available to answer your questions, diagnose your plumbing problems and offer top quality plumbing & heating services. We also have a staff of carpenters & contractors with the expertise to help manage your construction & remodeling projects from start to finish. DBA: Jim Trombly Plumbing & Heating, Granite State Water Systems.
"Techs on site did a wonderful job. Note: Get a detailed est. in writing. Happy with tech work. Not happy with business practice."
STEVE M on June 2020
No matter what your plumbing, heating, or cooling needs, one call to Jim Trombly Plumbing is all it takes. Since 1967, Jim Trombly Plumbing, Heating & Cooling has been the plumbing & heating contractor that customers turn to again & again for top value and high quality plumbing service. With employees whose service spans decades with our company, we offer experience you can trust backed by a commitment to old fashioned service & value. No job – from a leaky toilet to designing & installing commercial plumbing & heating systems to multi-zone air conditioning systems– is out of our league. Our master plumbers are available to answer your questions, diagnose your plumbing problems and offer top quality plumbing & heating services. We also have a staff of carpenters & contractors with the expertise to help manage your construction & remodeling projects from start to finish. DBA: Jim Trombly Plumbing & Heating, Granite State Water Systems.
"Techs on site did a wonderful job. Note: Get a detailed est. in writing. Happy with tech work. Not happy with business practice."
STEVE M on June 2020
Ferris Plumbing & Heating
Ferris Plumbing & Heating
Ferris Plumbing & Heating serves all of MA + NH. Our core values are based on top notch quality work, reliable and honest service. The Ferris plumbing standard is going above & beyond, making it easier & cheaper the next time servicing needs to be completed. We specialize in Remodels (bathrooms, kitchens, laundry rooms, etc) and are equipped with a dedicated crew that has the ability to complete the entire project, from beginning to end, minimizing the contractors in your home, & reducing the project timeline. We also do ALL plumbing and heating related service & installs. All active military and veterans receive a 10% discount and customers 65+ will also receive a 10% discount. Se habla español. WE SUPPORT BLM! We offer 24/7 emergency service.
"Excellent. I called Ferris Plumbing on a Thursday afternoon and left a message. Matt returned my call the next morning. After I explained the problem, Matt said he would try to get to me that day (Friday), but he may not be able to. Meanwhile, he suggested not using that toilet. He called later that day and said he couldn't make it, but would be able to on Monday. He called me on Monday morning to confirm that he would be coming and gave me a estimated time of arrival. Matt wasn't able to come himself, but two of his plumbers arrived mid-morning. I explain all of this because Matt's communication was OUTSTANDING. I always knew the status and I knew he would be arriving as soon as he could. His two plumbers were also excellent and efficient. They replaced the toilet flange and gasket, and remounted the toilet without needing to disturb the downstairs ceiling. I should mention that the toilet is the original installation of 48 years ago. The original gasket was completely disintegrated to the point that only few small fragments of it were left. They were also very careful to protect the carpet just outside the bathroom by placing a drop cloth to protect it. Their service and work was EXCELLENT. We are considering remodeling that bathroom and Ferris Plumbing will certainly be our first choice to do the work. I highly recommend (Matt) Ferris Plumbing."
Bruce B on November 2021
Ferris Plumbing & Heating serves all of MA + NH. Our core values are based on top notch quality work, reliable and honest service. The Ferris plumbing standard is going above & beyond, making it easier & cheaper the next time servicing needs to be completed. We specialize in Remodels (bathrooms, kitchens, laundry rooms, etc) and are equipped with a dedicated crew that has the ability to complete the entire project, from beginning to end, minimizing the contractors in your home, & reducing the project timeline. We also do ALL plumbing and heating related service & installs. All active military and veterans receive a 10% discount and customers 65+ will also receive a 10% discount. Se habla español. WE SUPPORT BLM! We offer 24/7 emergency service.
"Excellent. I called Ferris Plumbing on a Thursday afternoon and left a message. Matt returned my call the next morning. After I explained the problem, Matt said he would try to get to me that day (Friday), but he may not be able to. Meanwhile, he suggested not using that toilet. He called later that day and said he couldn't make it, but would be able to on Monday. He called me on Monday morning to confirm that he would be coming and gave me a estimated time of arrival. Matt wasn't able to come himself, but two of his plumbers arrived mid-morning. I explain all of this because Matt's communication was OUTSTANDING. I always knew the status and I knew he would be arriving as soon as he could. His two plumbers were also excellent and efficient. They replaced the toilet flange and gasket, and remounted the toilet without needing to disturb the downstairs ceiling. I should mention that the toilet is the original installation of 48 years ago. The original gasket was completely disintegrated to the point that only few small fragments of it were left. They were also very careful to protect the carpet just outside the bathroom by placing a drop cloth to protect it. Their service and work was EXCELLENT. We are considering remodeling that bathroom and Ferris Plumbing will certainly be our first choice to do the work. I highly recommend (Matt) Ferris Plumbing."
Bruce B on November 2021
The Londonderry, NH homeowners’ guide to water softener services
From average costs to expert advice, get all the answers you need to get your job done.

On average, a reverse osmosis water filter costs around $2,200, but there are a few variables that impact the total price. Learn about them in this guide.
•Wondering about water treatment system costs? Learn average prices, key cost factors, and ways to save on installation and maintenance for your home.

Your cost to install an under-sink water filter will depend on the type and size of system you choose and whether you need professional installation.

Your water softener works overtime to keep your water safe. Use this guide on how to check your water heater for damage or poor performance.

Need help dialing in your water hardness? Use this handy DIY guide on how to set a water softener to save money and get the best results possible.

Is hard water bad for you? Not to drink, but it can dry out your skin and create problems for your household appliances. Here’s what you need to know.
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