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    • Our Locations
      • Darnestown MD
      • Highland MD
  • Home
  • Services

    • Lifetime Warranty Well Pumps
    • Water Treatments
      • Acid Neutralizer
      • Aeration / Radon Removal
      • Birm
      • Chemical/Solution Feeders
      • Ozone Treatment
      • Sediment Filtration
      • Reverse Osmosis
      • UV Disinfection
      • Water Softener
    • Water Treatment Products
      • Carbon Tank
      • IBSB
      • KX Pro
      • Multistage Whole House System
    • Commercial Water Treatments
      • Food Service
      • Office
    • Well System Products
      • Lifetime Warranty Well Pumps
      • Pressure Tanks
    • Water Testing
    • Plumbing Services
    • Water Heaters
      • Water Heater Info
      • Water Heaters for Sale
    • Water Storage
    • Well Enclosure
  • Common Water Issues
    • Acidic Water
    • Arsenic
    • Bacteria
    • Bad Taste and Odor
    • Chloride
    • City Water Contaminants
    • Man Made Contaminants
    • Cloudy Water
    • Hard Water
    • Leaks
    • Low Pressure
    • Radon
    • Sediments
    • Stains
  • About NWS
    • About Us
    • Blog
    • Gallery
    • Testimonials
  • Resources
    • What’s your water issue
    • Water Treatment FAQ
    • Manuals & Brochures
    • How To
    • Water News
  • Contact Us
    • Our Locations

      • Darnestown MD
      • Highland MD

Food Service

Water Quality

Water Quality

Click for water quality solutions.
Well Pumps

Well Pumps

Click for well pump solutions.
Water Testing

Water Testing

Click for water testing solutions.

Water Softeners

Contact Us About Water Softeners

Chlorine Removal

Contact Us About Chlorine Removal

UltraPure Water

Contact Us About Process Water & Reverse Osmosis

Produce Misting

Contact Us About Humidity Cases & Misting

Custom Applications

Contact Us About Custom Applications

For over 40 years, National Water Service has been the leading water company throughout the Mid-Atlantic Region.
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Contact Information
7 Day a Week Emergency Service

Main Office

7249 Mink Hollow Road
Highland, MD 20777
(301) 854-1333
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Our Store

14111 Seneca Road
Darnestown, MD 20874
(410) 379-1993
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Call Us

Maryland: (301) 854-1333
Washington DC: (301) 854-1333
Baltimore: (410) 379-1993
Virginia: (540) 882-4006
Fax: (301) 854-1538
Email:  info@nationalwaterservice.com 
SOME OF OUR SERVICE AREAS

Featured Counties

- Frederick County, Maryland

- Howard County, Maryland

- Montgomery County, Maryland

- Loudoun County, Virginia

- Anne Arundel County, Maryland

- Baltimore County, Maryland

- Carroll County, Maryland

- Prince George's County, Maryland

- Fairfax County, Virginia

- Prince William County, Virginia

- Washington, D.C.


Featured Cities

- Clarksville, Maryland

- Gaithersburg, Maryland

- Germantown, Maryland

- Rockville, Maryland

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