COWAY MARYLAND
Water Purifiers & Air Purifiers Rental
Rent or buy Coway water purifiers, air purifiers, bidets, water softeners, and massage chairs in Howard County — including Ellicott City, Columbia, and Clarksville — as well as Gaithersburg, Rockville, Bethesda, and Baltimore. Installation and maintenance every 6 months are handled through Coway's official branch network.
- 13States Served
- 6In-home visits every 6 months
- FREEFree new installation
- 1:11:1 consultation in Korean
Maryland Service Areas
Select a region to see the cities where installation is available. Don't see your city? Send us your address and we'll check for you.
Howard County
Maryland's Korean-American hub, including Ellicott City and Columbia
- 엘리콧시티
- 컬럼비아
- 클락스빌
Montgomery County
Suburbs north of Washington, DC
- 게이더스버그
- 락빌
- 포토맥
- 베데스다
- 실버스프링
Baltimore
Baltimore City and nearby areas
- 볼티모어
Anne Arundel County
South of Baltimore
- 글렌버니
- 패서디나
Frederick County
Western Maryland
- 프레드릭
Carroll County
Northwest of Baltimore
- 린우드
Installation may be difficult in areas more than 70 miles from a Coway branch or authorized dealer.
Maryland Tap Water: It Depends on Which River
Montgomery County mainly uses Potomac River water, the Laurel area uses the Patuxent River, and Baltimore uses reservoir water. Agency reports show tap water meets federal and state standards, though hardness nearly doubles depending on the source.
U.S. Geological Survey (USGS) scale: 0–60 soft, 61–120 moderate, 121–180 hard, 181+ very hard. WSSC figures reflect its published average range; Howard County is the 2025 average.
Montgomery · Prince George's
108 years
Without a drinking water quality violation
- Serves about 1.9M from the Potomac and Patuxent Rivers
- 500,000 lab tests per year
- Lead 90th percentile below 2.0 ppb; 0 of 69 sites over the action level
- Removed all known lead service lines from the distribution system in the early 2000s
Howard County
70
mg/L average hardness (WSSC supply) · range 58–86 · moderate
- West of I-95 supplied by Baltimore City; east purchases water from WSSC
- Lead 90th percentile 4 ppb; 0 of 58 sites over the action level
- Maryland banned lead service line installation in 1972
- No 2025 violations
Baltimore
2.74
ppb lead 90th percentile · action level 15 ppb
- Serves about 1.8M from 3 reservoirs: Liberty, Prettyboy, and Loch Raven
- 100,000+ water analyses per year
- All PFOA/PFOS measurements below the federal 4 ppt standard
- Zero sites over the action level in lead testing
Watch for Scale in Montgomery
WSSC lists Potomac River water hardness at 120–130 mg/L on average — about double the Patuxent's. If scale on kettles or shower enclosures bothers you, consider adding a softener.
Chlorine Taste and Odor
WSSC, Howard County, and the City of Baltimore all use chlorine-based disinfectants. They stay within safety standards, but some households are sensitive to the taste and odor.
Different Water in the Same County
Howard County's water provider changes at I-95. Send us your address and we'll recommend products based on your actual provider.
These figures are system-wide data published by the agencies; actual water quality at your home may vary by water provider, season, and building plumbing. Check your local water provider's annual quality report for precise figures.
Popular with Maryland Households
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5 Steps to Installation
- 1ConsultKakaoTalk or phone
- 2Place your orderProduct and address confirmed
- 3AgreementIdentity and autopay details
- 4SchedulingConfirmed by phone or email
- 5Installation6-month maintenance begins
Do you install in Ellicott City or Columbia too?
Yes — installation is available across Howard County, including Ellicott City and Columbia, and Montgomery County, including Gaithersburg. For Baltimore and Frederick, send us your address and we'll confirm availability.
Is Maryland tap water safe to drink as is?
According to 2025 reports from WSSC Water, Howard County, and the City of Baltimore, tap water meets federal and state standards. Households usually choose a purifier for chlorine taste, water taste, or mineral content concerns.
Is Montgomery County water on the hard side?
WSSC lists the Potomac River water used by most of Montgomery County at 120–130 mg/L on average. Use a purifier for drinking water; if scale on showers and household water bothers you, consider adding a softener.
Can I install in a townhouse or apartment?
Most homes can be fitted, but renters should check with their landlord or management office first. We'll recommend the right model for your home — countertop or undersink — during your consultation.
How are filters maintained after installation?
During your rental, a Coway specialist visits every 6 months to replace filters and inspect your products. Maintenance is included in your rental fee.
Maryland Installation Consultation
Consultations are free — send us your address and we'll confirm installation availability right away.