COWAY USA RENTAL · MARYLAND
Coway Water & Air Purifier Rental in Maryland
An essential choice for those who want to protect a healthy home from an unclean environment—discover Coway products, always backed by Coway’s experience and technology.
Air on the mend, aging water mains not yet. That's Maryland.
Maryland's particle pollution has improved enough to pass, but ozone around Baltimore still earns an F. And in 2022, E. coli in Baltimore's tap water led to a boil water advisory. Here is the picture, based on public data.
Updated September 2026 · Sources listed belowMaryland by the numbers
From Baltimore City DPW, the American Lung Association, University of Maryland research and local reporting
- How it was foundRoutine water testing
- Advisory lengthAbout 4 days
- Precautionary advisory extended toParts of Baltimore County
- Asked to check with their utilityParts of Howard County
After the advisory lifted, the city told residents to flush their pipes and throw out ice made during the advisory.
Prince George's also moved from F to D. Progress is real, but Baltimore County still gets an F.
Particle pollution grades in the Washington-Baltimore metro now pass, but ozone keeps failing. About 570,000 Maryland children live with unhealthy air.
Winter road salt is among the causes. The trend applies to areas drawing on the Potomac, such as Montgomery and Prince George's counties (per University of Maryland research coverage).
Where you live changes what matters
The Baltimore side deals with smog and aging water mains; the D.C. side with winter road salt.
Howard CountyEllicott City, Columbia, Clarksville
Parts of the county were asked to check with their utility during Baltimore’s 2022 E. coli advisory.
Baltimore City & CountyBaltimore, Towson, Catonsville
Baltimore County has the state’s worst ozone (F). Calls to upgrade aging water infrastructure keep coming.
Montgomery · Prince George’sRockville, Germantown, Silver Spring, Bowie
Part of the region where sodium in Potomac source water is trending up. Prince George’s ozone improved from F to D in 2026.
Anne ArundelAnnapolis, Glen Burnie, Severn
Ozone improved from F to C in the 2026 report. An air purifier here is mainly for pollen and smoke days.
A year in Maryland
Spring pollen, summer smog and smoke, winter road salt.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tree pollen | ||||||||||||
| Ragweed | ||||||||||||
| Ozone (smog) | ||||||||||||
| Canadian wildfire smoke | ||||||||||||
| Road salt runoff |
Typical patterns only; they vary year to year. Canadian wildfire smoke in 2023 was cited as a reason Maryland’s air grades slipped.
Clean at the plant. Still clean at your tap?
Maryland tap water meets standards. WSSC Water, serving Montgomery and Prince George's counties, reports PFAS below federal limits and low lead in home testing. But some things are beyond a treatment plant's reach: dissolved salt, the pipes leading to your home, and water main failures.
Water that leaves the plant clean still takes a different path to every tap. Reverse osmosis (RO) reduces sodium that treatment plants don't remove, and a lead-certified purifier lets you manage lead at the one tap you drink from. Check each model's certifications on its product page.
During a boil water advisory, boil your purifier's water too or use bottled water. Once it lifts, flush your lines and check your filter; rental customers get this covered with regular filter service. For the air side: Maryland's particle levels pass and ozone is what's left. HEPA filters capture particles, but ozone is a gas and HEPA filters don't remove it.
Check your own water in 3 minutes
Find the right purifier for your home’s water system.
- Baltimore City DPW, Required boil water advisory (September 2022)
- Inside Climate News, West Baltimore after the E. coli advisory
- AP, Baltimore lifts boil water advisory
- American Lung Association, State of the Air 2026 Maryland release
- Hoodline, Maryland county grades in 2026
- University of Maryland / Washington Post, salt in D.C.-region water sources
- WSSC Water, PFAS test results · WSSC Water, annual water quality report · Summary of WSSC report (salt, lead) · EPA Lead and Copper Rule Improvements (2024)
Coway focuses on your home well-being
Coway is committed to your home’s well-being through premium products and services, modern design, and cutting-edge technology. Experience our solutions for a healthier lifestyle, including water purifiers, air purifiers, bidets, water softeners, and massage chairs.
Premium Air Purifier
Have you ever thought about the quality of the air in your home—the air you live with 24 hours a day, from morning to night? Coway air purifiers keep your indoor air clean by removing ultra-fine dust as well as odors. We provide the best products and services through regular filter maintenance visits every six months or convenient self-care with filter delivery.
Premium RO-Membrain Water Purifier
Start your day with a refreshing glass of clean water from Coway. Our RO filtration system, verified by certified institutions, delivers trusted performance. It removes harmful substances such as viruses and heavy metals, while the Inno Filter enhances the taste, making your water richer and more enjoyable.
Free Delivery and Installation! Heart Service
From friendly consultation to ongoing care, experience Coway’s dedicated service focused on your complete satisfaction. Enjoy free delivery and installation, warranty coverage throughout your contract period, and most importantly, regular maintenance such as complimentary filter replacements and cleaning—so you can count on Coway’s clean and reliable service every step of the way.
Business Office, Restaurant and Home
Coway products help keep every space in your daily life clean and healthy. From workplaces where you spend most of your time to homes where children stay throughout the day, Coway solutions are designed to provide cleaner, healthier environments wherever you are.
Backed by facts, not fiction
Coway operates one of the largest R&D centers in the industry, ensuring that its water filters, air filters, and home wellness appliances are developed based on scientific evidence—not assumptions. With a leading research team and rigorous testing processes, Coway puts your family’s health and well-being first.
Coway Maryland
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Coway Maryland Service Areas
Water purifiers, air purifiers, bidets, and water softeners — all available
| Region | Cities |
|---|---|
| Howard County | Ellicott City / Columbia / Clarksville / Elkridge |
| Montgomery County | Rockville / Gaithersburg / Germantown / Bethesda / Silver Spring / Potomac |
| Baltimore & Nearby | Baltimore / Towson / Owings Mills |
| Anne Arundel County | Annapolis / Glen Burnie |
Don't see your city? Many surrounding areas are also covered. Call or message us to confirm.
* Service availability may change depending on local Coway branch coverage.
