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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
51–75 of 184Maryland American Water--severn System
MD0020027 · 5,447 served
Town of Chestertown
MD0140002 · 5,400 served
Town of Leonardtown
MD0180006 · 5,000 served
Town of Chesapeake Beach
MD0040003 · 5,000 served
Midland-lonaconing
MD0010018 · 5,000 served
Western Region Allegany Distrib. System
MD0010009 · 4,955 served
Town of Manchester
MD0060006 · 4,954 served
Town of Berlin
MD0230001 · 4,500 served
Town of Denton
MD0050001 · 4,500 served
Town of Delmar
MD0220001 · 4,500 served
Town of Perryville
MD0070018 · 4,413 served
Prince Frederick
MD0040011 · 4,371 served
Town of Middletown
MD0100018 · 4,288 served
Boonsboro - Keedysville
MD0210002 · 4,250 served
City of Pocomoke City
MD0230006 · 4,100 served
Town of Indian Head
MD0080020 · 4,100 served
The Provinces
MD0020029 · 3,991 served
Solomons
MD0040027 · 3,811 served
Town of Charlestown
MD0070029 · 3,791 served
Elkton West
MD0070015 · 3,500 served
Eastern Correctional Institute
MD0190013 · 3,500 served
Town of Centreville
MD0170001 · 3,322 served
Naval Support Facility, Indian Head
MD0080058 · 3,321 served
Town of Princess Anne
MD0190002 · 3,300 served
Country Lakes
MD0180023 · 3,016 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