State Hub
Maryland Water Quality
184
Utilities in database
5.5M
Residents served
0
With open violations
74
PFAS monitored
Quick Answer
Maryland public drinking water is served by 184 EPA-tracked water systems, providing service to approximately 5.5 million residents through public utilities. No open health-based violations are currently recorded across tracked systems in the EPA federal database. 74 systems have official PFAS monitoring records from the EPA UCMR 5 program (2023–2025). About 25% of MD residents use private wells, which fall outside federal utility compliance monitoring.
No open health-based violations are currently recorded in the EPA SDWIS database for Maryland's tracked water systems. Always verify with your utility's Consumer Confidence Report for annual test results.
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.
Safest Large Utilities
Maryland systems with no open health violations serving 10,000+ residents.
Utilities in Maryland
1–25 of 184Washington Suburban Sanitary Commission
MD0150005 · 1,900,000 served
City of Baltimore
MD0300002 · 1,600,000 served
Glen Burnie-broadneck
MD0020017 · 290,606 served
Howard County D.p.w. Distribution
MD0130002 · 286,158 served
Harford County D.p.w.
MD0120016 · 104,567 served
City of Hagerstown
MD0210010 · 92,200 served
Waldorf - Charles County Dpw
MD0080049 · 84,296 served
New Design - Frederick County
MD0100030 · 74,911 served
Crofton-odenton
MD0020008 · 62,986 served
Fort George G. Meade
MD0020012 · 62,234 served
City of Frederick
MD0100015 · 54,000 served
City of Rockville
MD0150003 · 52,000 served
Lexington Park
MD0180007 · 43,030 served
City of Westminster
MD0060015 · 35,256 served
City of Annapolis
MD0020001 · 35,000 served
City of Salisbury
MD0220004 · 30,343 served
Town of Ocean City
MD0230003 · 30,000 served
City of Cumberland
MD0010008 · 27,039 served
Broad Creek
MD0020004 · 26,033 served
City of Bowie
MD0160002 · 25,000 served
Freedom District
MD0060002 · 24,867 served
Patuxent Naval Air Station (navfac-wash)
MD0180022 · 22,000 served
City of Aberdeen
MD0120001 · 18,006 served
Easton Utilities
MD0200003 · 17,357 served
Town of Elkton
MD0070011 · 15,625 served
Key Contaminant Concerns in Maryland
These contaminants appear most frequently in Maryland utility records or pose elevated risk in this region based on EPA data.
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. Critically, a utility's water quality report can show zero detected lead at the treatment plant while your specific tap still delivers elevated lead — because the contamination happens inside the distribution system and your home's plumbing, not at the source.
EPA limit: 15 ppb (action level)
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.
EPA limit: 80 µg/L (TTHMs) / 60 µg/L (HAA5)
City Water Reports in Maryland
Tap water quality pages for Maryland cities — violations, PFAS records, utility profiles, and official source links.
Maryland PFAS Watchlist — all utilities with official recordsIndependent Water Testing
Find a certified lab in Maryland
Utility compliance records show what water systems report to the EPA. An independent test from a certified laboratory confirms what's actually in your tap water. Maryland labs can test for PFAS, lead, nitrates, bacteria, and dozens of other contaminants.
Explore Water Quality in Maryland
Washington Suburban Sanitary Commission
Violation history, PFAS records, and official source links
City of Baltimore
Violation history, PFAS records, and official source links
Glen Burnie-broadneck
Violation history, PFAS records, and official source links
PFAS monitoring records — Maryland
74 water systems in Maryland with EPA UCMR 5 records
Lead in Maryland drinking water
State-specific lead data, violation utilities, and testing guidance
PFAS in Maryland drinking water
State-specific PFAS data, MCL context, and treatment options
Certified water testing labs in Maryland
Labs certified for PFAS (EPA 533/537.1), lead, and bacteria testing
Water treatment options
Reverse osmosis, activated carbon, and filtration guides with cost ranges
Data sources and methodology
How WaterUtilityReport.com sources and validates official EPA data
Common Questions About Maryland Drinking Water
Does Maryland drinking water have PFAS?
74 Maryland water systems have EPA UCMR 5 PFAS monitoring records (2023–2025)
Which Maryland water utilities have open violations?
Browse Maryland utility compliance records and violation history
How do I test my water in Maryland?
State-certified labs for PFAS (EPA 533/537.1), lead, nitrate, and bacteria testing
What treatment removes PFAS from MD tap water?
Reverse osmosis removes PFAS, lead, arsenic, and nitrates — cost, maintenance, and NSF certification explained
What do Maryland PFAS records tell me about my water?
EPA limits, health context, and what UCMR 5 detection above MRL means for your water
How is Maryland water quality data sourced here?
EPA SDWIS violations, UCMR 5 PFAS records, and CCR data — sources, accuracy notes, and limitations
Maryland Water FAQs
Data sources: Utility compliance and violation data from EPA SDWIS (Safe Drinking Water Information System). PFAS monitoring records from EPA UCMR 5 (Unregulated Contaminant Monitoring Rule 5, 2023–2025). Contaminant data from EPA and ATSDR public references. This page summarizes public records — it is not a compliance determination. Methodology →
Last updated: 2026-04-19