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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
76–100 of 184Town of North Beach
MD0040030 · 3,000 served
Town of Mountain Lake Park
MD0110007 · 3,000 served
City of Crisfield
MD0190001 · 2,976 served
Town of Emmitsburg
MD0100010 · 2,921 served
Cedar Cove
MD0180002 · 2,728 served
Town of St. Michaels
MD0200006 · 2,650 served
Bel Air - Pinto Distribution System
MD0010003 · 2,614 served
Fountaindale South
MD0100013 · 2,610 served
Town of Smithsburg Distribution System
MD0210018 · 2,500 served
Town of Federalsburg
MD0050002 · 2,450 served
Wakefield Valley
MD0060017 · 2,436 served
Town of Snow Hill
MD0230007 · 2,409 served
Town of Williamsport Distribution System
MD0210021 · 2,400 served
Lake Village Townhomes
MD0020019 · 2,400 served
Greenridge Subdivision
MD0120011 · 2,271 served
Herald Harbor
MD0020044 · 2,241 served
Saint Marys College
MD0180013 · 2,200 served
Town of Rising Sun
MD0070021 · 2,200 served
Town of Westernport
MD0010033 · 2,200 served
Mountain Hill Water Company
MD0070034 · 2,154 served
Town of Hurlock
MD0090005 · 2,150 served
Johns Hopkins University
MD0300007 · 2,058 served
Beaches Water Co-operative
MD0040009 · 2,000 served
Perry Point V.a. Medical Center
MD0070017 · 2,000 served
Town of Hancock
MD0210012 · 1,921 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