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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
126–150 of 184Summit/highlands
MD0040026 · 1,108 served
Sam Hill Estates
MD0100040 · 1,036 served
Bayside-queenslanding
MD0170007 · 1,030 served
Town of Hebron
MD0220002 · 1,022 served
Town of Willards
MD0220007 · 1,021 served
Breton Bay
MD0180001 · 1,012 served
Town of Union Bridge
MD0060013 · 997 served
Worton
MD0140007 · 955 served
Cambridge Farms
MD0100033 · 953 served
Pine Hills
MD0070019 · 953 served
Town & Country Mobile Home Park
MD0070235 · 950 served
Swan Point
MD0080046 · 945 served
Prospect Bay
MD0170009 · 913 served
Holiday Mobile Estates, Inc.
MD0020211 · 900 served
Lord Calvert Trailer Park
MD0180213 · 892 served
Cloverhill 3 - Consecutive to Md0100015
MD0100031 · 888 served
Town of Grantsville
MD0110005 · 885 served
Stella Maris
MD0030212 · 873 served
Southern Region Allegany Distrib. System
MD0010045 · 865 served
Town of Woodsboro
MD0100027 · 846 served
Maryland Manor Mobile Home Park
MD0020214 · 810 served
Cedarville Mobile Home Park
MD0160207 · 780 served
Fairmount
MD0190012 · 750 served
Lyons Creek Estates
MD0020213 · 750 served
Town of Preston
MD0050005 · 750 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
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Data source: Utility data from EPA SDWIS. 184 active community water systems ingested. CCR contaminant data ingestion in progress.
Last updated: 2026-04-19