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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
176–184 of 184Waysons Mobile Court
MD0020223 · 540 served
Town of Secretary
MD0090007 · 535 served
Persimmon Hills
MD0180046 · 514 served
Wilderness Run
MD0180036 · 511 served
Nantucket Point(distribution-delaware)
MD0230020 · 500 served
Crystal Beach Manor/t&c Utility
MD0070008 · 500 served
Swan Harbour Dell Mobile Home Park
MD0120215 · 500 served
Epping Forest
MD0020011 · 500 served
Riddle Farm
MD0230019 · 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
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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