Water Filtration & Testing Company in Washington, DC

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

Under the sink home water serviceClean water is the first step to healthy living, whether you own a home or manage a business. That is why National Water Service has been providing Washington, D.C. and near-by areas for over 40 years with dependable water services. Our professionals are dedicated to helping clients get the best water they can. We have earned repeat clientele that have called upon us for decades. 


We ensure that all of our customers receive trusted water testing, treatment, water heater services, well pump replacements, and more whenever they need it. From water specialists to master plumbers, our team is comprised of the top professionals so we can provide a one-stop-shop business for all water solutions. 


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

Your Home’s Water Filtration System Comes First

Home water service

Owning a home comes with a lot of water care and servicing water appliances. Luckily for you, our expert team manages every need you have, regardless of the size of the job or room it takes place in, so you can keep living stress free. 


Contact National Water Service so we can provide you with dependable service, guaranteed. Just a few of the things we can do for you and your family’s home include:



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. Don’t keep living with questionable water when you have a company that has a reputation you can trust. 


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 to discuss your residential needs. 

Your Washington, D.C. Business Has Water Needs, So Let Us Serve You

Commercial water service tank and employee

Owning or managing 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, from filtration to water storage.


Hospitals, shopping centers, restaurants, labs, 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.


We complete produce mistings, water coolers, lab water filtration, and more. All of our work is backed by decades of experience, so there is never a risk when you hire us. 


All around Washington, D.C. 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, no hassle. 

We Provide Washington, D.C. the Highest Customer Satisfaction

Water service employee managing a wellClient satisfaction is our top priority with every water replacement, repair, or service we handle. We employ the best professionally trained specialists in both water treatment and purification, as well as in pump services, in order to meet the goal of 5-star service every time. 


For four decades we have held an unblemished record, and it allows us to retain 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. 


National Water Service also supplies 24-7 emergency services. Call on us when your water stops, floods, or something more occurs and you need someone right away who you can trust. 


These achievements allow our team 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. 


National Water Service adheres to all guidelines, provides tidy system installations, and always follows-up with an inspection to confirm our services were completed correctly.


With our highest investment being in our customers, why would you go anywhere else? Contact us to handle the water services you need today.