Water Filtration and Water Treatment Companies in Maryland
A plain, alphabetical directory of 34 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 Maryland. Every entry was checked on the company's own website. We do not rate or rank anyone.
- Water softeners (32)
- Whole-house filtration (31)
- Water testing (25)
- Water heater/plumbing (24)
- Reverse osmosis (21)
- Well water treatment (19)
- UV disinfection (16)
- Iron and sulfur removal (10)
- Commercial water treatment (8)
- Drinking water systems (7)
Local water facts
- WSSC Water states that all the water it filters comes from either the Potomac River or the Patuxent River; Patuxent water is drawn from the Triadelphia and T. Howard Duckett (Rocky Gorge) reservoirs.
Source: WSSC Water, Where Does My Water Come From? https://wsscwater.com/mywater - WSSC Water describes its Potomac River water as hard (about 120-130 mg/L of dissolved calcium and magnesium) and its Patuxent water as soft (about 60-65 mg/L); most of Montgomery County and lower Prince George's County receive Potomac water.
Source: WSSC Water, Where Does My Water Come From? https://wsscwater.com/mywater - Baltimore City's drinking water comes from three reservoirs (Liberty, Loch Raven and Prettyboy) holding about 75 billion gallons, and the city may draw from the Susquehanna River during droughts.
Source: Baltimore City Department of Public Works, Water Quality https://www.baltimorecity.gov/publicworks/water-system-in-the-city/water-quality - Maryland Department of the Environment notes that private wells are not regulated by the state or federal government, that homeowners are responsible for testing and maintaining their wells, and advises testing well water at least once a year.
Source: Maryland Department of the Environment, PFAS Private Well Factsheet (March 2023) https://mde.State.md.us/PublicHealth/Documents/PFAS%20Private%20Well%20Factsheet_March2023.pdf - For home treatment installs, MDE recommends a licensed plumber or a properly licensed installer, with license numbers beginning WCI, MWD or MSD.
Source: Maryland Department of the Environment, PFAS Private Well Factsheet (March 2023) https://mde.State.md.us/PublicHealth/Documents/PFAS%20Private%20Well%20Factsheet_March2023.pdf - The Frederick County Health Department collects private well samples for coliform bacteria, nitrate and turbidity, and says annual well water testing is generally recommended.
Source: Frederick County Health Department, Well Water Testing https://health.frederickcountymd.gov/340/Well-Water-Testing
All companies, A to Z
Atlantic Blue Water Services
Water treatment, well and plumbing company with offices in Westminster, Frederick, Gaithersburg, Severna Park and Forest Hill. It installs softeners, whole-house filters, reverse osmosis and UV systems, services wells, and offers water testing for homes and businesses.
Boothe's Heating, Air, Plumbing, Drains & Electrical
Southern Maryland home services company that consults on, installs, calibrates and repairs salt-based, salt-free and hybrid water softeners, and offers a water quality test.
BPM Heating, Cooling & Plumbing
Frederick HVAC and plumbing contractor that installs water softeners, whole-house carbon and sediment filtration, combined softener-filter systems and point-of-use filters.
Brian B. Quick Plumbing
Plumbing company with offices in Beltsville and Reisterstown that installs water softeners and whole-home filtration after assessing a home's water.
Carroll Water Systems
Authorized EcoWater dealer providing softeners, filtration, reverse osmosis, water testing and well services including drilling and pumps, for homes and businesses. Also has offices in Virginia and Pennsylvania.
Crystal Water Plumbing
Hagerstown plumbing company that installs water softeners and water purification systems and handles well pump installation.
Culligan of Annapolis (Elkridge), MD
Local Culligan dealer offering water softening, reverse osmosis, whole-house filtration, home and well water testing, and salt delivery and repairs.
Culligan of Hagerstown, MD
Local Culligan dealer in Hagerstown providing water softening, reverse osmosis and whole-house filtration, home and well water testing, and well water solutions across Washington and Frederick counties.
D & D Advanced Water Technologies, LLC
Southern Maryland well service company that repairs well pumps and tanks and installs softeners, carbon and sediment filters, whole-house filters, chlorinators and UV lights.
Douglas & Son Services
Boyds-based service company that installs water softeners and water filtration systems for homes in upper Montgomery County.
First Class Mechanical
Westminster plumbing, HVAC and well pump contractor that installs softeners, sediment and backwashing filters, reverse osmosis units, UV systems and acid neutralizers, with free drinking water testing.
Five Star Plumbing Services
Plumbing company serving Harford and Baltimore counties that installs softeners, drinking water reverse osmosis, carbon and UV filters, iron removal and acid neutralizers, with free well water testing.
Hague Quality Water of Maryland
Family-owned company founded in 1993 that provides water softeners, filtration and water testing, plus well pump, pressure tank and water heater service, from offices in Annapolis and Ocean City.
Heidler Plumbing
Annapolis plumbing contractor that installs softeners, whole-home and point-of-use filtration and kitchen reverse osmosis for well and county water, including iron and manganese removal, with water testing.
HydroWells
Well drilling and service company based in Poolesville and Dickerson that installs and repairs softeners, sediment filtration, iron and manganese removal, UV and acid neutralizers, and arranges certified lab water testing.
Larry & Sons Plumbing, Heating, Cooling, & Electrical
Home services company with Hagerstown and Frederick locations offering point-of-use and point-of-entry filtration, softeners, reverse osmosis including whole-house units, water testing and treatment repair.
Lifewell Water Solutions LLC
Master plumber-led company that installs, services and maintains water softeners and treatment systems and provides water testing on the Eastern Shore and in Anne Arundel County.
Logan Mechanical, LLC
Clinton mechanical and plumbing contractor that installs, replaces and services water softeners and water filtration systems across Prince George's, Charles and nearby counties.
Mallick Plumbing & Heating, Inc.
Plumbing and heating company with offices in Gaithersburg, Frederick and Woodbine that installs whole-home filtration, softeners and under-sink reverse osmosis, with on-site or lab water testing.
Master Plumbing
Gaithersburg plumbing contractor that installs water treatment systems including Aquasana filters and services existing systems of other brands.
Mid-Atlantic Water Services
Annapolis water treatment and plumbing company installing softeners, whole-home filtration, reverse osmosis and UV or ozone systems, treating well water for iron, sulfur and bacteria, with free in-home testing.
Mike's Plumbing & Heating Service, Inc.
Essex plumbing and heating company that installs whole-house and under-sink water filters and maintains and repairs residential water quality systems of all makes.
Mr. Water LLC
Hagerstown water treatment company, also known as Mr. Water Professional Water Treatment of Maryland, installing softeners, sediment filters, reverse osmosis, iron and sulfur removal, acid neutralizers and UV for homes and businesses, with in-home water analysis.
National Water Service
Woodbine company providing well pump service, plumbing and water treatment, including softeners, carbon and sediment filtration, reverse osmosis, iron and sulfur systems, UV and radon removal, for homes and commercial sites.
Northern Maryland Water Specialists, Inc.
Authorized RainSoft dealer that sells, installs and maintains softeners, reverse osmosis, carbon and whole-house treatment and acid water systems, with free water testing.
R&G Water Systems, Inc.
Family-run Carroll County company that services well pumps and tanks and installs water softeners, whole-house and carbon filters, reverse osmosis units and UV systems. It offers a free basic water analysis.
Saffer Total Home
Baltimore plumbing, heating and electrical company that installs whole-house filtration, softeners, point-of-use and whole-house reverse osmosis, UV and iron and sediment filters, and tests hardness, pH and well water.
Sterling Quality Water
Pentair dealer in Westminster listed for whole-house filtration, water softening, under-sink filtration and water testing with system recommendations.
Supreme Service Today
Plumbing, HVAC and electrical company that installs and repairs water softeners, whole-house filtration and reverse osmosis systems, with testing and setup for home water purification.
Sykes Services
Waldorf plumbing company offering water filtration, softeners and conditioners, reverse osmosis drinking water systems and UV purification, with free on-site water testing.
Tri-County Pump Service, Inc.
Well pump, water treatment and septic company with offices in Boonsboro and Frederick. It installs softeners, iron filters, reverse osmosis, sulfur aeration, UV and PFAS treatment, with free water analysis.
TriState Home Services
Frederick home services company that installs carbon, reverse osmosis and UV filtration, whole-home filtration and purification, and repairs and installs water softeners.
VITO Services
Rockville home services company offering whole-home carbon filtration, point-of-use reverse osmosis, anti-scale equipment and chlorine feed pumps for private water systems, with testing before equipment is chosen.
Water Doctor
Water treatment and well company that installs softeners, home filtration, reverse osmosis, UV sterilizers and iron and acid water treatment, and provides residential, commercial and lab-certified water testing plus well pump service.
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See Featured listingsHow 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.