Water Testing & Treatment Company in Gaithersburg, MD

For Over 40 Years We’ve Been Trusted with Residential and Commercial Water Filtration


Under the sink home water serviceClean water: it is the first step to healthy living, whether you own a home or own a business. That is why we have been serving Gaithersburg and near-by areas for over 40 years, helping clients get the best water they can. It has earned us repeat customers and client dedication for decades.

We ensure that all our customers receive the best water testing, treatment, and well pump replacements available. From water quality solutions specialists to employing a master plumber, we provide a one-stop-shop business to have all your water needs covered with a single phone call. 


Having our team at your service means you can get back to focusing on the other aspects of life, letting us handle the replacements and repairs. At National Water Service, we provide free consults, discounts for new customers, and ensure customer satisfaction is a five star rating, every time.

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Your Home’s Water Filtration System Comes First


Home water service

Owning a home comes with a lot of water care, and that can seem overwhelming. Luckily for you, our team manages every need you have, regardless of the size of the job, to keep you living stress free.

Contacting National Water Service provides you with dependability, and the highest guarantee possible. Just a few of the things we can do for you and your family’s home includes:


We have experience treating lead and radon, and softening up hard water levels. City water, country water, county supplied and wells all need to be checked and treated with care, and we know how to service each one.

Our plumber is also on hand for bathroom or kitchen remodels, granting you the space you want with the cleanest water on-hand, in budget with competitive rates. A free consult can be scheduled today, reach out to us for details. 



Your Business Has Water Needs, Let Us Serve You

Commercial water service tank and employee

Owning your own business is a satisfying feeling, and you feel proud every time you serve your clients and employees. Give them more of the best by trusting us with your water system needs.

Hospitals, shopping centers, restaurants, and local offices have all trusted us to treat their water and provide water storage and flood prevention systems in their buildings. It’s our trenching, boosts and tanks knowledge, and availability to work with low yielding wells and irrigation systems alike that makes us a top company for commercial water system needs, whatever job you manage.

All around Gaithersburg and the near-by areas we are trusted by government and non-government owned companies for their water systems. We work alongside local construction firms, builders, and architects in order to create custom applications for water purifications and treatments, giving you the best your business can get.

We Provide Gaithersburg the Highest Customer Satisfaction

Water service employee managing a wellClient satisfaction is our top priority with every install and repair we complete. We employ professionally trained specialists in both water treatment and purification, as well as in pump services, in order to meet this goal.

For decades we have held an unblemished record, and it allows us to attain repeat clients whom we enjoy assisting no matter where life takes them. With reasonable, competitive rates, we stay within budget without sacrificing quality, and that’s just one of our many promises.

These achievements allow us to invest in job training, classrooms, and proper equipment so we are always ahead of the game. Our tools include underground line finders, pump hoists, and well cameras to fit a variety of water servicing needs.

We adhere to all guidelines, provide tidy system installations, and always follow-up with an inspection to confirm our services were completed correctly. Additionally, we are around every day of the week for emergency services, so you don’t have to wait till Monday rolls around to get those accidents corrected.

With our highest investment in our customers, why would you go anywhere else?