Water Treatment & Filtration Company in Rockville, MD

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

Under the sink home water serviceThe most important part of a healthy life is water, whether you own a home or supply water for a business. Having served Rockville and surrounding areas for the last 40 years, we have earned our client’s dedication and proven our workmanship to be one of the best. 


It is important to National Water Service that the customers we service receive the best water treatment, testing, and well services available. That’s why we provide unmatched quality you can stand behind.


Our team is composed of water specialists and a master plumber, because we want to make sure you only need to contact one business to have all your water needs covered. It is about reducing hassle and cutting out stress to make every project a breeze. 


With us at your service, you can get back to focusing on the other aspects of your home and business. Our team provides free consults, discounts for new customers, and ensures our customer satisfaction is a five star rating, every time. 

Your Home’s Water Filtration System Comes First

Home water service

Home ownership is all about water care, from filtration to treatment. Luckily for you, National Water Service manages every need you have, from the smallest replacement to the largest repair. 


Because we service just about every water task you may come across, you know you have dependability and the highest guarantee possible. A few of the things we can do for you and your family’s home includes:



Country water, city water, well water, and county supplied water all need to be tested and treated with the same, excellent care. Treating lead and radon, and softening up hard water levels are available to you as part of our services, so you can trust the water coming from your pipes, wherever you may live. 


Our master plumber is also on hand for bathroom or kitchen remodels, granting you the space you want within budget, all bases covered. 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

Nothing is more satisfying than owning your own business, and you should feel proud every time you serve your clients and employees. Now you can give them more of the best by trusting us with your water system needs.


All around Rockville and surrounding areas we have been trusted by non-government and government owned companies alike for their water systems. National Water Service works alongside local construction firms, builders, and architects to create custom applications for water purifications and treatments, which supplies our clients with the best they can get. 


Hospitals, shopping centers, restaurants, and local offices have all trusted us to treat water and provide water storage and flood prevention systems in their buildings. It is about 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 needs.


Because your business is important to you, let us be apart of the satisifaction. 

We Provide Rockville the Highest Customer Satisfaction

Water service employee managing a wellCustomer expectations exceeded are always our top goal with every install and repair we complete. We employ teams of professionally trained specialists in both water treatment and purification, and well pump services in order to get you where your home or business needs to be. 


For decades National Water Service has held an unblemished record, and that allows us create repeat clients we enjoy assisting no matter where life leads them. Offering reasonable, competitive rates, we stay within your budget without sacrificing quality.


All achievements by our team allows us to invest in job training, classrooms, and proper equipment so we stay ahead of the game. The tools we use include underground line finders, pump hoists, and well cameras to fit all water servicing needs. 


Our employees and business practices adhere to all guidelines, provide tidy system installs, and we follow-up with inspections 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 disasters serviced. 


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