Water Filtration and Water Treatment Companies in Northern Virginia

A plain, alphabetical directory of 41 companies that install or service whole-house water filtration, water softeners, reverse osmosis and well-water treatment, or test water, for homes and businesses in Northern Virginia. Every entry was checked on the company's own website. We do not rate or rank anyone.

• Water testing (38)
• Water softeners (35)
• Whole-house filtration (30)
• Reverse osmosis (28)
• Well water treatment (24)
• Water heater/plumbing (24)
• UV disinfection (17)
• Iron and sulfur removal (15)
• Drinking water systems (14)
• Commercial water treatment (9)

Local water facts

• Fairfax Water draws raw water from two primary sources, the Potomac River and the Occoquan Reservoir, and serves nearly two million people in Northern Virginia communities including Fairfax, Loudoun and Prince William.
  Source: Fairfax Water, About Us - https://www.fairfaxwater.org/about-us
• Loudoun Water's Central System drinking water comes from the Potomac River and Goose Creek (fed by Beaverdam Creek Reservoir and Goose Creek Reservoir); Potomac water is treated by Loudoun Water and/or its wholesaler, Fairfax Water.
  Source: Loudoun Water, Your Drinking Water Quality - https://www.loudounwater.org/residential-customers/your-drinking-water-quality
• About 20% of Loudoun County residents, mostly in the western and northern parts of the county, rely on groundwater from wells; the county estimates roughly 15,000 domestic wells serve individual households.
  Source: Loudoun County, Groundwater - https://www.loudoun.gov/1372/Groundwater
• The Virginia Department of Health recommends testing private wells for bacteria and nitrate every year; new wells must pass a bacteria test before use, but later testing is left to the well owner.
  Source: Virginia Department of Health, Guidance on Testing Your Private Well Water - https://www.vdh.virginia.gov/environmental-health/onsite-sewage-water-services-updated/organizations/private-well-water-information/guidance-on-testing-your-private-well-water/
• Loudoun County advises well owners to have their well checked once a year, including a bacteria test, and to retest whenever taste, smell or color changes or the system is serviced.
  Source: Loudoun County, Wells & Onsite Septic Systems - https://www.loudoun.gov/5744/Wells-Onsite-Septic-Systems
• The Virginia Household Water Quality Program (Virginia Tech / Virginia Cooperative Extension) runs drinking water clinics in around 70 Virginia counties each year, testing private water for 28 chemical and bacterial constituents for $70 per kit.
  Source: Virginia Household Water Quality Program, Virginia Tech - https://www.wellwater.bse.vt.edu/vahwqp.php

All companies, A to Z

How to choose a water treatment company

• Test first. A certified lab test (on a well) or your utility's annual water quality report plus a hardness test (on public water) tells you what needs treating.
• Match the treatment to the problem. Hardness needs a softener, chlorine taste needs carbon, and iron, sulfur, acidity and bacteria each need their own stage.
• Check the license. Ask for the company's state contractor or plumbing license number and confirm it with the state.
• Get it in writing. Ask for the equipment model, what is included in installation, the warranty and the yearly maintenance cost.