State Hub
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
101–125 of 184Mount Saint Marys University
MD0100019 · 1,900 served
Town of Greensboro
MD0050003 · 1,878 served
Town of Oakland
MD0110008 · 1,850 served
Potomac Heights
MD0080038 · 1,800 served
Town of Rock Hall
MD0140006 · 1,750 served
Town of New Windsor
MD0060008 · 1,732 served
Town of Ridgely
MD0050006 · 1,600 served
Lakeside Village
MD0210215 · 1,575 served
Knolls of Windsor
MD0100041 · 1,553 served
Town of Myersville
MD0100020 · 1,516 served
Waterside
MD0100029 · 1,509 served
Springfield Hospital Distribution
MD0060010 · 1,500 served
Town of Pittsville
MD0220009 · 1,500 served
Scientists Cliffs
MD0040014 · 1,425 served
Town of Sharpsburg
MD0210017 · 1,360 served
Crownsville Hospital Center
MD0020009 · 1,348 served
Boones Mobile Estates
MD0020231 · 1,315 served
Town of Funkstown Distribution System
MD0210008 · 1,300 served
Wicomico Shores
MD0180018 · 1,262 served
Fairland Crossing Apartments
MD0150102 · 1,248 served
Town of Trappe
MD0200007 · 1,200 served
Sherwood Forest Water Company
MD0020035 · 1,200 served
Chesapeake Heights (bayside Forest)
MD0040018 · 1,190 served
Greenbrier
MD0180045 · 1,161 served
Highfield
MD0210001 · 1,141 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