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Verified Reviews for Water Softener Service pros in Derwood, MD
*The Angi rating for Water Softener Service companies in Derwood, MD 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 Derwood, MD 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 16, 2025
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Tankless Concepts
Tankless Concepts
We specialize in the installation and servicing of Rinnai and Navien tankless water heaters and boilers. We are proud to be recognized by Rinnai as the Top Dealer/Installer in Maryland, Virginia and Washington DC. We have earned Rinnai's "Advanced Comfort Expert (ACE)" status. We are also proud to be an authorized dealer / service provider for Navien. We are a nine-time recipient of the Angie's List esteemed Super Service Award and have been featured in their Super Service Spotlight and in Advice from Angie's List by Angie Hicks. We have over 25 years of gas experience and have been installing and servicing tankless water heaters since September of 2004. We offer in-home consultations and provide professional estimates within 24-48 hours of consultation. We stand behind our installations with a two-year (2-year) warranty on workmanship and materials and we provide maintenance and repair service for every appliance that we install.
"So glad we found this company! We had a few estimates and Tankless Concepts was by far the most knowledgeable and professional with reasonable prices. They were able to explain every aspect of the job to get the correct system and installation for our home. When it came time to install the team was super friendly and helpful and they were able to make on-site adjustments to help us get everything just right. We are very happy with how things turned out and would absolutely recommend for anyone considering having a tankless water heater."
Andy T on June 2024
We specialize in the installation and servicing of Rinnai and Navien tankless water heaters and boilers. We are proud to be recognized by Rinnai as the Top Dealer/Installer in Maryland, Virginia and Washington DC. We have earned Rinnai's "Advanced Comfort Expert (ACE)" status. We are also proud to be an authorized dealer / service provider for Navien. We are a nine-time recipient of the Angie's List esteemed Super Service Award and have been featured in their Super Service Spotlight and in Advice from Angie's List by Angie Hicks. We have over 25 years of gas experience and have been installing and servicing tankless water heaters since September of 2004. We offer in-home consultations and provide professional estimates within 24-48 hours of consultation. We stand behind our installations with a two-year (2-year) warranty on workmanship and materials and we provide maintenance and repair service for every appliance that we install.
"So glad we found this company! We had a few estimates and Tankless Concepts was by far the most knowledgeable and professional with reasonable prices. They were able to explain every aspect of the job to get the correct system and installation for our home. When it came time to install the team was super friendly and helpful and they were able to make on-site adjustments to help us get everything just right. We are very happy with how things turned out and would absolutely recommend for anyone considering having a tankless water heater."
Andy T on June 2024

4 Service Pros
4 Service Pros
4 Service Pros has 4 separate divisions. Each Professional we employ only works in the trade they are licensed in. Electrical, Plumbing, HVAC and Remodeling services... Based in Northern Virginia & serving customers throughout the metro area. We do everything from new installations and repairs to preventative maintenance. Our company welcomes jobs of all sizes. We have extensive experience working with countless residential and commercial customers in Northern Virginia and surrounding areas. Whether you need a leak fixed or complete rewiring, we have the pros that will get the job done quickly, efficiently, and at the right price. We guarantee 100% customer satisfaction on every project or task we perform. We don't use outside labor and are proud to be one of the highest rated contractors on Angie's List. Give us a call today 703-444-0000. Additional email - [email protected]. Phone - (703) 444-0000
"I claimed one of the “2 Toilet Tune-Up” Angi’s special with 4 Service Pros (Snell). When I contacted Snell I talked with a very nice lady who scheduled me to get 2 plumbers to come out the next day from Noon - 4pm. I was told they would call 20 minutes to 30 minutes before hand to let me know they were coming. I waited from Noon to 4:05pm, never received a phone call, and so I called Snell to find out if my plumbers were still coming. I was told that there was an emergency situation in Chantilly, VA, that required my 2 plumbers to go to Chantilly instead of my place that morning. I understand emergencies do happen, but Snell knew that my plumbers were needed for that major Chantilly, VA, leak from the morning. They should have called me once they found out that my assigned plumbers would not be able to come out to my place within my scheduled time appointment. I should not have had to wait from noon to 4pm and then have to call them to find out that they were not coming. I rescheduled with them, and set another appointment for the next day The next day Brandon Thomas came out, and he was outstanding. He is very friendly, professional, knowledgeable, efficient, and a very good plumber. My problems turned out to be quite different than I originally had thought and he explained my options. I went with the option that he recommended and am very happy with the results. He also gave me discounts to help make-up for my inconvenience for having to re-schedule the appointment. I definitely recommend Snell (4 Service Pros) to all my friends and family."
Janice M on September 2024
4 Service Pros has 4 separate divisions. Each Professional we employ only works in the trade they are licensed in. Electrical, Plumbing, HVAC and Remodeling services... Based in Northern Virginia & serving customers throughout the metro area. We do everything from new installations and repairs to preventative maintenance. Our company welcomes jobs of all sizes. We have extensive experience working with countless residential and commercial customers in Northern Virginia and surrounding areas. Whether you need a leak fixed or complete rewiring, we have the pros that will get the job done quickly, efficiently, and at the right price. We guarantee 100% customer satisfaction on every project or task we perform. We don't use outside labor and are proud to be one of the highest rated contractors on Angie's List. Give us a call today 703-444-0000. Additional email - [email protected]. Phone - (703) 444-0000
"I claimed one of the “2 Toilet Tune-Up” Angi’s special with 4 Service Pros (Snell). When I contacted Snell I talked with a very nice lady who scheduled me to get 2 plumbers to come out the next day from Noon - 4pm. I was told they would call 20 minutes to 30 minutes before hand to let me know they were coming. I waited from Noon to 4:05pm, never received a phone call, and so I called Snell to find out if my plumbers were still coming. I was told that there was an emergency situation in Chantilly, VA, that required my 2 plumbers to go to Chantilly instead of my place that morning. I understand emergencies do happen, but Snell knew that my plumbers were needed for that major Chantilly, VA, leak from the morning. They should have called me once they found out that my assigned plumbers would not be able to come out to my place within my scheduled time appointment. I should not have had to wait from noon to 4pm and then have to call them to find out that they were not coming. I rescheduled with them, and set another appointment for the next day The next day Brandon Thomas came out, and he was outstanding. He is very friendly, professional, knowledgeable, efficient, and a very good plumber. My problems turned out to be quite different than I originally had thought and he explained my options. I went with the option that he recommended and am very happy with the results. He also gave me discounts to help make-up for my inconvenience for having to re-schedule the appointment. I definitely recommend Snell (4 Service Pros) to all my friends and family."
Janice M on September 2024

W H Winegar & Son Plumbing and Heating
W H Winegar & Son Plumbing and Heating
Award winning, family owned & operated. For over 40 years, W.H. Winegar & Son Plumbing and Heating has served the Burtonsville, MD, and surrounding areas with a commitment to service and value. We appreciate your interest and look forward to earning your business. Additional Phone - (301) 907-4650; Payment also accepted by cash.
"Awesome. Two separate jobs. Both went well."
Benjamin S on November 2021
Award winning, family owned & operated. For over 40 years, W.H. Winegar & Son Plumbing and Heating has served the Burtonsville, MD, and surrounding areas with a commitment to service and value. We appreciate your interest and look forward to earning your business. Additional Phone - (301) 907-4650; Payment also accepted by cash.
"Awesome. Two separate jobs. Both went well."
Benjamin S on November 2021

Solutions in Aqua Services/American Water Pro
Solutions in Aqua Services/American Water Pro
Expert water specialists that will solve your problem 100% guaranteed, making Solutions In Aqua the leader in water treatment, water softeners, filtration and purification, water testing and diagnostics, whether city or well water. We also specialize in pressure issues, pressure tanks, well line repair, well pumps, since 1984 in the MD, VA, WV areas. #1 in customer satisfaction, we offer an unparalled level of knowledge and professionalism. The best warranties, low price guarantee and 100% satisfaction are just a few reasons why we have such a loyal customer base. We work with you to support your equipment with our Service Reminder Program and are happy to support the do it yourselfer. We offer in house financing with no interest payments and accept on line payments as well as all major credit cards. Referrals are our only business, no paid advertisements or sales commissions, resulting in quality, not quantity.
"I have used these guys for a few years now for all of my water needs. They have replaced piping, replaced a busted valve, installed a water softener system, and completed water testing for the sale of my house. I have NEVER been disappointed. Denise has been my go to person and I honestly don’t know what I would have done without her. These guys come into my house by themselves and I never have to worry. Completely top notch quality work from people that are honest and trustworthy! I thank them for all they have done... and I am sure they will continue to do for me in the future."
William R on September 2018
Expert water specialists that will solve your problem 100% guaranteed, making Solutions In Aqua the leader in water treatment, water softeners, filtration and purification, water testing and diagnostics, whether city or well water. We also specialize in pressure issues, pressure tanks, well line repair, well pumps, since 1984 in the MD, VA, WV areas. #1 in customer satisfaction, we offer an unparalled level of knowledge and professionalism. The best warranties, low price guarantee and 100% satisfaction are just a few reasons why we have such a loyal customer base. We work with you to support your equipment with our Service Reminder Program and are happy to support the do it yourselfer. We offer in house financing with no interest payments and accept on line payments as well as all major credit cards. Referrals are our only business, no paid advertisements or sales commissions, resulting in quality, not quantity.
"I have used these guys for a few years now for all of my water needs. They have replaced piping, replaced a busted valve, installed a water softener system, and completed water testing for the sale of my house. I have NEVER been disappointed. Denise has been my go to person and I honestly don’t know what I would have done without her. These guys come into my house by themselves and I never have to worry. Completely top notch quality work from people that are honest and trustworthy! I thank them for all they have done... and I am sure they will continue to do for me in the future."
William R on September 2018

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

Quality Air & Heating Inc
Quality Air & Heating Inc
Let us take care for your furnace, central air, ductwork, and any part of your heating or air conditioning systems. Your new energy efficient system could save you as much as 30%. We also provide plumbing, whole house duct cleaning and indoor air quality. Call Quality Air & Heating Inc. for any plumbing, heating, or cooling emergency issues. With our 24-hour emergency services, we have got you covered any time there's a problem in your home.
"Mr. David Hung and his Team did an Excellent Job in the Installation of Tankless water Heater. They tested the access to hot water in three floor Levels. I am getting hot water rapidly. I am waiting for the final phase of Installation of the Split-level gas meter upgrade. I shall make the final part of total Payment after this installation. David is honest in professional matters. I wish him and Quality Air well in these novel installations in WDC Area."
Mrinal D on February 2023
Let us take care for your furnace, central air, ductwork, and any part of your heating or air conditioning systems. Your new energy efficient system could save you as much as 30%. We also provide plumbing, whole house duct cleaning and indoor air quality. Call Quality Air & Heating Inc. for any plumbing, heating, or cooling emergency issues. With our 24-hour emergency services, we have got you covered any time there's a problem in your home.
"Mr. David Hung and his Team did an Excellent Job in the Installation of Tankless water Heater. They tested the access to hot water in three floor Levels. I am getting hot water rapidly. I am waiting for the final phase of Installation of the Split-level gas meter upgrade. I shall make the final part of total Payment after this installation. David is honest in professional matters. I wish him and Quality Air well in these novel installations in WDC Area."
Mrinal D on February 2023

Mallick Plumbing & Heating
Mallick Plumbing & Heating
Mallick Plumbing & Heating provides any and all types of plumbing services to residential and commercial clients throughout the entire Washington Metropolitan Area and Silver Spring, Maryland. We currently have a fleet of over twenty full-time service technicians and twelve apprentices, which are led by Vice President Ken Howes and Residential Service Manager Jeff Fletcher. Mallick conducts pre-employment screenings on each candidate after making a contingent offer of employment. State judiciary and national case searches are completed, as well as state and national sex offender searches. In addition to extensive background checks, substance abuse tests are administered. Mallick is a drug-free workplace and we strive to ensure the environment remains safe for our employees and our customers. Our team has over 30 years of experience in the plumbing industry and is dedicated to providing quality workmanship and the highest customer satisfaction. Our family approach to business has allowed us to build strong long-lasting relationships with contractors, owners, suppliers, subcontractors and employees, and we look forward to the opportunity to provide honest plumbing services for you and your family. 9X Super Service Award Winner from 2012-2022 and voted best Gaithersburg Plumber 2020, 2021, 2022 & 2023
"Mallick technicians Billy and Bryce fixed a bathroom leak and did a thorough inspection of our bathrooms and discovered plumbing issues that if not fixed could have caused a major issue in our 30 year old bathroom renovation. They were efficient, professional and personable. Would highly recommend."
Liz C on April 2025
Mallick Plumbing & Heating provides any and all types of plumbing services to residential and commercial clients throughout the entire Washington Metropolitan Area and Silver Spring, Maryland. We currently have a fleet of over twenty full-time service technicians and twelve apprentices, which are led by Vice President Ken Howes and Residential Service Manager Jeff Fletcher. Mallick conducts pre-employment screenings on each candidate after making a contingent offer of employment. State judiciary and national case searches are completed, as well as state and national sex offender searches. In addition to extensive background checks, substance abuse tests are administered. Mallick is a drug-free workplace and we strive to ensure the environment remains safe for our employees and our customers. Our team has over 30 years of experience in the plumbing industry and is dedicated to providing quality workmanship and the highest customer satisfaction. Our family approach to business has allowed us to build strong long-lasting relationships with contractors, owners, suppliers, subcontractors and employees, and we look forward to the opportunity to provide honest plumbing services for you and your family. 9X Super Service Award Winner from 2012-2022 and voted best Gaithersburg Plumber 2020, 2021, 2022 & 2023
"Mallick technicians Billy and Bryce fixed a bathroom leak and did a thorough inspection of our bathrooms and discovered plumbing issues that if not fixed could have caused a major issue in our 30 year old bathroom renovation. They were efficient, professional and personable. Would highly recommend."
Liz C on April 2025
Plumbing

Suma Plumbing and Drain Cleaning, LLC
Suma Plumbing and Drain Cleaning, LLC
Finding the right plumbing company can be a struggle sometimes. Suma Plumbing and Drain Cleaning offers quick, reliable service you can trust. We are dedicated to helping you when you need it the most and we leave all of our jobs tidy and clean.
"Very professional and reliable. I had a complicated sump pump issue and he really took his time to get it right which I really appreciate. I'll be calling him the next time I have any plumbing issues in my house."
Morgan M on September 2024
Finding the right plumbing company can be a struggle sometimes. Suma Plumbing and Drain Cleaning offers quick, reliable service you can trust. We are dedicated to helping you when you need it the most and we leave all of our jobs tidy and clean.
"Very professional and reliable. I had a complicated sump pump issue and he really took his time to get it right which I really appreciate. I'll be calling him the next time I have any plumbing issues in my house."
Morgan M on September 2024

Stang Plumbing
Stang Plumbing
10 Employees. No subs. Cost is determined by the job itself. Service Fees Apply for certain equipment. Extra charge applies for after hours and weekend services.
"I contacted Stang Plumbing to give me an estimate on replacing the copper water supply piping (hot and cold) in my house with PEX A. Stang gave me a reasonable estimate right from the start. The two other estimates I requested further confirmed that Stang’s estimate was very reasonable and after they promptly responded to several questions I had concerning their proposal, I chose them to do the work. The workers showed up promptly on the first day to start the work and every day thereafter. The lead plumber, Rob, did a great job of communicating the progress at the end of the day and what he intended to accomplish the next day. Each day Rob made sure that water service was restored through out the house and that there were no leaks from the work that had been performed. The piping replacement was completed on the schedule originally proposed. Rob, and his helper Mark, were very professional and courteous and a pleasure to deal with. I will happily chose Stang Plumbing for any future work and highly recommend them for any plumbing services you may need."
Edward B on September 2023
10 Employees. No subs. Cost is determined by the job itself. Service Fees Apply for certain equipment. Extra charge applies for after hours and weekend services.
"I contacted Stang Plumbing to give me an estimate on replacing the copper water supply piping (hot and cold) in my house with PEX A. Stang gave me a reasonable estimate right from the start. The two other estimates I requested further confirmed that Stang’s estimate was very reasonable and after they promptly responded to several questions I had concerning their proposal, I chose them to do the work. The workers showed up promptly on the first day to start the work and every day thereafter. The lead plumber, Rob, did a great job of communicating the progress at the end of the day and what he intended to accomplish the next day. Each day Rob made sure that water service was restored through out the house and that there were no leaks from the work that had been performed. The piping replacement was completed on the schedule originally proposed. Rob, and his helper Mark, were very professional and courteous and a pleasure to deal with. I will happily chose Stang Plumbing for any future work and highly recommend them for any plumbing services you may need."
Edward B on September 2023
The Derwood, MD homeowners’ guide to water softener services
From average costs to expert advice, get all the answers you need to get your job done.
•Discover how much well water treatment systems cost, including installation, maintenance, and tips to save. Get expert insights to plan your water system project.
•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.

Whether you have a fridge filter, pitcher filter, or end-of-faucet filter, learn how to clean a water filter to ensure pure, fresh water with these steps.

Are water softeners worth it? While they offer benefits to many homeowners, they aren’t always necessary. Learn whether this appliance will pay for itself.

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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