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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
151–175 of 184Cliffton on the Potomac
MD0080009 · 744 served
Town of Oxford
MD0200005 · 726 served
Port Deposit
MD0070020 · 725 served
Fairlee
MD0140003 · 725 served
Hunting Quarters
MD0180038 · 715 served
Town of Queenstown
MD0170003 · 705 served
Rolling Acres
MD0180017 · 699 served
Mount Aetna
MD0210015 · 688 served
Martingham Utilities Cooperative
MD0200004 · 675 served
Town of Chesapeake City [formerly South]
MD0070006 · 673 served
Piney Point
MD0180034 · 672 served
Town of Sharptown
MD0220005 · 625 served
Town of Millington
MD0140010 · 625 served
Town of Friendsville
MD0110004 · 622 served
St. Clements Shores
MD0180012 · 620 served
Charlotte Hall
MD1180005 · 615 served
Hunters Brooke/falcon Ridge Subd
MD0080083 · 614 served
Bridge Pointe-kent Island Village
MD0170017 · 600 served
Grasonville
MD0170020 · 600 served
Oyster Cove
MD0170011 · 600 served
Forrest Farm Subdivision
MD0180054 · 577 served
Keswick Multi-care Center
MD0300005 · 575 served
Town of Galena
MD0140004 · 560 served
Laurel Ridge
MD0180037 · 560 served
Charles County Gardens Water
MD0080008 · 551 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