National Water Service, Water Treatment and Purification

At National Water Service, we set the standard for home water treatment, purification, as well as a complete line of well pumps, boosters, etc. If you need it, we have it! In addition to offering outstanding service and workmanship, our staff is friendly and eager to answer any of your questions at 301-854-1333.

National Water Service

Commercial services run far and wide with too many scenarios to list. Call or e-mail us for help on any commercial products & services. Famous in the mid-atlantic for fast contractor response times and reasonable pricing. Homebuilders, Architects, Kitchen Remodelers, or any related trade who deals with water is welcome. Thousands of items from o-rings, filters, tanks, completed systems, to commercial pumps. If we don't have it, we will get it!

National Water Service is a 3M Authorized Dealer


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For over 30 years, National Water Service has been serving the entire Mid Atlantic region with Quality products and Exceptional Service!

Proudly Serving Clients for Over 30 years in:

  • Howard County
  • Montgomery County
  • Frederick County
  • Anne Arundel County
  • Carroll County
  • Baltimore County
  • Prince George's County
  • Harford County
  • Washington DC
  • Baltimore City
  • Loudoun County
  • Fairfax County