Water Treatment & Filtration Company in Fairfax County VA

Providing Water Heater Services, Sump Pump Replacements and Water Filtration Systems for Over 40 Years

pump truck

Water quality is never something you will need to worry about when you hire National Water Service to manage your water filtration, water testing, or other water service needs for your home or business. 


From kitchen taps to laundry machines, the water that flows through your house will be trusted, safe, and clean with our professional services. We have been around for four decades and have become a leader in water quality. We aim for affordable, trusted water testing for every home and family, whether you are in a city or using well water in the country. 


Our loyal clients rely on us for well pump replacementswater heater installations, water filtration systems, plumbing services, and more. Our commercial services include everything from office water coolers to produce misting and even water storage solutions. 


We are your reliable one-stop for all water quality needs.  Contact us about our free consultation that tests your water’s current quality — from there we will offer solutions and work together for any water needs you have. 


Live the National Water Service way, with safer, cleaner water. We use low maintenance systems that are simple to service, so cleaner water is a quick fix away. 

Residential Water Testing for Odors, Contaminants, and More

running waterSome people may suggest your water quality is better in the city versus the country, or your well water surpasses county water systems. The truth is, though, water quality varies from neighborhood to neighborhood, and all water sources are at risk of odors, contaminants, and more. The only way to ensure safe water is with water testing. 


Contact us so we can provide you with a free basic analysis, and offer you reasonable rates on water solutions you may need as indicated by the results of your water test. It’s not just about clean water, it’s about safe drinking water for you and your family, no matter where you live. 


We’re available to provide solutions if you are suffering from:



Our professionals also offer pressure tanks for well, flood prevention, provide water storage solutions for a variety of systems, and service your well.


All our work is left neat and tidy, so any small tasks you want to handle can be done with ease, and follow-up services are no-hassle. With National Water Service, your water system works for you, no issues. 

Commercial Water Services from Restaurants to Offices

Reverse Osmosis and a pressure tankTrust us as your commercial water service company  — we handle offices, doctor and science labs, office kitchens, food industries, and more. From simple water filtration to water storage, we have the solution you need. 


The commercial water services we offer include:


Our reputation has proven reliable, trustworthy, and exceedingly excellent in all water projects we are hired for on a commercial basis. When you own a business, there is enough for you to handle without being concerned about your water systems, so let us take care of that so you can get back to business. 


Don’t let another day pass with questionable water quality or water filtration systems, contact National Water Service to talk to us about obtainable, functioning commercial water filtration systems, storage systems, and more. 


Emergency Water Services in Fairfax County When You Need It the Most

pump crew toolsCustomer satisfaction is what we pride ourselves on, which is why we listen to what you are looking for: emergency seven-day-a-week services, a plumber on staff, non-proprietary systems, and the top tools in the industry. We exceed expectations by going above and beyond what you expect for a water service company. 


National Water Service is available to redo your kitchen or bathroom with our master plumber and crew on staff. We also provide gas lines for generators and grills, and service your water heater, making the work done on your home consistent and unbeatable. Don’t hire several different companies when we can give you the dependability you’ve been searching for. 


We have been a leader in the water service industry for over forty years because we are committed to the quality of our work and always want to be a neighbor t0 our clients — it’s not just about water service but reliable, proven solutions that work for you. 


Talk to us about any questions, concerns, or to schedule a service. We have special offers for new clients to get you started. We will put your mind at ease and get you back to enjoying your home and business. 

We Service Your City! 













Fairfax Station

Great Falls


Mount Vernon


Dunn Loring


West Springfield


Bailey’s Crossroads

Wolf Trap


North Springfield

Seven Corners

Rose Hill

Fort Hunt

Pimmit Hills

Belle Haven

West Falls Church


Hybla Valley


Mason Neck

Lake Barcroft


Kings Park West