Logo for National Water Service with a large blue N stylized to include a water droplet and circular design, followed by the words ational water service in dark blue text.
301-854-1333
Schedule Free Water Test

#1 Rated in Northern Virginia

Water Treatment Experts

  • 47+ Years of Experience
  • Precision Workmanship
  • Emergency Services
  • Innovative Solutions
  • Family Atmosphere
  • Upfront & Competitive Pricing
  • Trusted Customer Service

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Green graphic with white text reading Winner of and a circular badge that says 2024 Neighborhood Faves nextdoor, featuring a trophy icon above—celebrating National Water Service for top-notch plumbing and well pump expertise.
A digital badge from Expertise.com reads Best Plumbers in Washington DC 2021 with a laurel wreath and geometric logo on a black background.
A dark blue circular badge with gold laurel leaves around the edge, a white star symbol at the top, and the text LOC8NEARME RECOMMENDS National Water Service above gold stars at the bottom.
Logo featuring MEMBER Water Quality Association in blue text with gold wave-like shapes and a gold star, highlighting BUSINESS EXCELLENCE below—ideal for businesses in well pump, plumbing, or water treatment industries.
Logo for the Eastern Water Quality Association. The text reads “Member EWQA” with a blue wave graphic under the large “A” and “Eastern Water Quality Association” below, representing excellence in Plumbing and Well Pump services.
A graphic with the text 5 Star Google Reviews Company featuring five gold stars above the Google logo, highlighting National Water Service as a highly rated well pump and water treatment company. The background is dark blue and white.

Maryland, DC & Northern VA

Water
treatment

A diagram showing red circles passing through a barrier with three yellow arrows, becoming blue circles on the other side, representing a water filtration or transformation process in Maryland Water Treatment.

Water Filtration

Two laboratory beakers filled with yellow and blue liquids, with a magnifying glass showing a blue water drop above them and two curved arrows indicating Maryland water testing or analysis.

Water Testing

Illustration of a water filtration system with three vertical filter cartridges connected by pipes and a faucet on the right side, showcasing advanced water treatment technology for purifying water in Maryland homes.

Reverse Osmosis System

A blue water cooler bottle with a water droplet symbol on the front, outlined in black—perfect for showcasing water filtration or treatment solutions.

Water Softener

A cartoon-style chemistry flask filled with blue liquid, bubbles rising above its neck, and small black dots inside—evoking a bubbling chemical reaction inspired by water testing or filtration in Maryland.

Acid Neutralizer

Illustration of two large, cylindrical, blue storage tanks with pipes connecting them at the top and sides, likely used for storing liquids in an industrial setting such as a Maryland Water Treatment or water testing facility.

Storage Tanks

A square pink icon displays the chemical symbol Rn for Radon, with the atomic number 86 above and "Radon" below, resembling a periodic table tile—ideal for Maryland Water Treatment or water testing visuals.

Radon Removal

A laboratory beaker filled with blue liquid, marked with measurement lines, containing bubbles and a black stirring rod or sensor inside—perfect for testing water softener efficiency or Maryland Water Treatment solutions.

Chemical Feeder

A blue and white graphic icon of a water filter cartridge with cracked lines inside, representing a worn or broken water filtration filter.

Sediment Filtration

Illustration of a blue water pump with a black curved pipe on top, red buttons on the side, and a striped blue handle on the left—ideal for Maryland water testing or water filtration setups.

Booster Pumps

A circular icon in shades of blue, inspired by water testing and treatment in Maryland, features the letters UV and two diagonal lines symbolizing ultraviolet light. The circle is divided into darker and lighter blue halves.

UV Disinfection

Blue outlined illustration of an industrial tank or storage container, often used in Maryland Water Treatment systems, with a rounded top, central hatch, and a vertical pipe extending from the top right side.

Carbon Tanks

Illustration of a house with a large water pipe and faucet in front, from which a blue water droplet is falling, symbolizing home plumbing or water supply—ideal for highlighting Maryland Water Treatment or water testing services.

Whole House Water Filtration System

And More!

Coupons

An older man in military uniform salutes while facing a large American flag, blurred in the background—honoring service much like the dedication seen at the National Water Service.

$ 25 OFF

Installation and Service

For Active Duty Military, Veterans Or First Responders

A home water filtration and softener system is mounted on a wooden wall, featuring pipes, filters, a large white tank, two tall black and grey cylinders, control panels, and various components for water treatment.

$ 75 OFF

New Water Treatment

For New Customers Getting New Water Treatment Installs Only

A white PVC well pipe with a capped top stands upright in a grassy yard with scattered leaves, in front of suburban homes and a street.

$ 100 OFF

New Well Pumps Installation

For New Customers Getting New Well Pump Installs Only

Two men work together on a well pump, using tools and examining its components on a table. Manuals, papers, and drink tumblers are beside them as they focus on the task—showcasing their expertise in plumbing for National Water Service.

$ 25 OFF

Customer First Service Call

For New Customers Getting First Service Call

A plumber kneels on a cloth in a kitchen, working under the sink cabinet. Tools and cleaning supplies are on the counter, with a red plumbing machine in the foreground. The kitchen features wooden floors and dark wood cabinets.

$ 40 off

Any Plumbers Service Call

For use only one time per customer

Service Area

Counties:

Fairfax County, Virginia and Loudoun County

Areas and cities:
Reston, Centreville, Lorton, Mount Vernon, Newington, Seven Corners, West Falls Church, Lake Barcroft; Herndon, Springfield, Oakton, Franconia, Bailey’s Crossroads, Rose Hill, Mantua, Huntington, Vienna, Annandale, Fairfax Station, Dunn Loring, Wolf Trap, Fort Hunt, Hybla Valley, Kings Park West, McLean, Tysons, Great Falls, Clifton, Lincolnia, Pimmit Hills, Idylwood, McNair, Chantilly, Burke, Merrifield, West Springfield, North Springfield, Belle Haven, Mason Neck, and Crosspointe

visit nationalwaterservice!
Logo for National Water Service. The letter N is stylized with a blue water droplet below it, and the words “ational water service” appear to the right of the droplet design.