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Maryland Water Quality
184
Utilities in database
5.5M
Residents served
25%
On private wells
2
Key contaminants tracked
Drinking Water in Maryland
Maryland has 184 community water systems serving approximately 5.5 million residents. Primary water sources include groundwater. The most commonly reported contaminants include disinfection byproducts, lead. 25% of Maryland residents rely on private wells. MDE holds primary enforcement authority under the Safe Drinking Water Act.
Utilities in Maryland
26–50 of 184City of Cambridge Water
MD0090002 · 15,000 served
Chapel Hill - Aberdeen Proving Grounds
MD0120002 · 15,000 served
City of Havre De Grace
MD0120012 · 14,000 served
Maryland American Water Company
MD0120003 · 13,200 served
Ocean Pines
MD0230005 · 11,890 served
Town of La Plata
MD0080025 · 11,535 served
City of Frostburg
MD0010011 · 11,000 served
Town of Mount Airy
MD0060007 · 9,890 served
Chesapeake Ranch Estates
MD0040004 · 9,500 served
Stevensville
MD0170019 · 9,155 served
U.s. Naval Academy
MD0020042 · 8,700 served
Town of North East
MD0070016 · 8,600 served
Town of Walkersville
MD0100025 · 8,440 served
Fort Detrick
MD0100011 · 7,900 served
City of Brunswick
MD0100005 · 7,312 served
City of Taneytown
MD0060012 · 6,750 served
Town of Hampstead
MD0060003 · 6,600 served
Bryans Road
MD0080033 · 6,260 served
Town of Thurmont
MD0100023 · 6,200 served
Town of Poolesville
MD0150002 · 6,005 served
Mystic Harbour
MD0230011 · 5,945 served
City of Fruitland
MD0220008 · 5,907 served
Eastern Region Allegany Distrib. System
MD0010005 · 5,703 served
Deep Creek Lake Water Service Area
MD1111096 · 5,502 served
Lavale Sanitary Commission
MD0010016 · 5,500 served
Key Contaminant Concerns in Maryland
Lead
Lead is a naturally occurring heavy metal that was widely used in plumbing infrastructure until it was banned for new installations in 1986. An estimated 9.2 million lead service lines still connect homes to public water mains across the United States, along with millions of homes with lead solder in their internal plumbing.
DBPs
When utilities add chlorine to water to kill pathogens, it reacts with dissolved organic matter — leaves, algae, soil — to produce disinfection byproducts (DBPs). Over 600 DBPs have been identified. The EPA regulates two groups: total trihalomethanes (TTHMs, including chloroform) and haloacetic acids (HAA5). DBP levels tend to be highest in surface water systems and in warm months when organic matter is elevated.
Maryland Water FAQs
Quick Links
Data source: Utility data from EPA SDWIS. 184 active community water systems ingested. CCR contaminant data ingestion in progress.
Last updated: 2026-04-19