Overview

EWG's drinking water quality report for Maryland shows results of tests conducted by the water utilities in Maryland and provided to EWG by the Maryland Department of the Environment.

LARGE UTILITIES

ALL UTILITIES WITH VIOLATIONS

LARGE UTILITIES WITH VIOLATIONS

Large utilities in Maryland

Below are utilities in Maryland serving over 10,000 people, listed alphabetically.

Utility	Location	People Served

Broad Creek	Millersville, MD	23,179
Chapel Hill - Aberdeen Proving Grounds	Aberdeen, MD	15,000
City of Aberdeen	Aberdeen, MD	16,200
City of Annapolis	Annapolis, MD	35,000
City of Baltimore	Baltimore, MD	1,600,000
City of Bowie	Bowie, MD	25,000
City of Cambridge	Cambridge, MD	15,000
City of Cumberland	, MD	27,039
City of Frederick	Frederick, MD	54,000
City of Frostburg	, MD	11,000
City of Hagerstown	Hagerstown, MD	92,200
City of Havre De Grace	Havre De Grace, MD	14,000
City of Rockville	Rockville, MD	52,000
City of Salisbury	Salisbury, MD	30,343
City of Westminster	Westminster, MD	35,256
Crofton-Odenton	Millersville, MD	62,986
Easton Utilities	Easton, MD	17,357
Freedom District	Westminster, MD	24,867
Glen Burnie-Broadneck	Millersville, MD	290,606
Harford County Department of Public Works	Bel Air, MD	104,567
Howard County Department of Public Works	Columbia, MD	286,158
Lexington Park	California, MD	43,030
Maryland American Water Company	Hopewell, MD	13,200
New Design - Frederick County	Frederick, MD	49,200
Ocean Pines	Berlin, MD	11,890
Patuxent Naval Air Station (NAVFAC-WASH)	Patuxent River, MD	22,000
Town of Elkton	Elkton, MD	15,625
Town of Ocean City	410-723-1832, MD	30,000
Waldorf	La Plata, MD	91,260
Washington Suburban Sanitary Commission	Silver Spring, MD	1,900,000

Utilities that accumulated/accrued the most violation points as of July 2021 to June 2024 in Maryland

The Environmental Protection Agency's Enforcement and Compliance History Online (ECHO) database collects compliance and enforcement-related information for drinking water utilities nationwide. ECHO water quality violation scores take into account federal health-based water quality standards, as well as monitoring, reporting and other drinking water quality requirements. Points are accrued based on specific problems at the utility - violations of health-based drinking water standards receive more points than monitoring and reporting violations - and the length of time until the violations were corrected.

Utility	Location	People Served	Violation Points

Country Village Mobile Home Park	Clarksburg, MD	38	12
Town of North East	North East, MD	8,600	10
Claiborne	Claiborne, MD	60	9
Tebbston On Magothy	Columbia, MD	52	7
Persimmon Hills	California, MD	539	6
Barrelville	Mt. Savage, MD	130	6
King & Kennedy	California, MD	169	6
Town of Chesapeake Beach	Chesapeake Beach, MD	5,000	5
Pleasant View Nursing Home	, MD	104	5
Town of Trappe	Trappe, MD	1,200	5
Deer Lodge Mobile Home Park	Frederick, MD	87	5
Town of Leonardtown	Leonardtown, MD	2,930	5
Maple Hill Mobile Estates	Port Deposit, MD	180	5
Angelica Nurseries - Nursery View	Kennedyville, MD	38	5
Town of Millington	Millington, MD	625	5
Town of Willards	Willards, MD	940	5
City of Havre De Grace	Havre De Grace, MD	14,000	5
Greenridge Subdivision	Dunkirk, MD	2,271	5
Concord Estates Mobile Home Park	Hagerstown, MD	150	5
Taylors Mobile Home Park	Greensboro, MD	27	4
Woodlawn Mobile Home Park - Old	Port Deposit, MD	50	3
The Neighborhoods At St. Elizabeth	Baltimore, MD	162	3
Woodlawn Mobile Home Park - New	Port Deposit, MD	200	2
Regency Manor Mobile Home Park	Lothian, MD	224	1
Chapel Hill Nursing Center	Randalstown, MD	125	1
Pine Trailer Park	Lusby, MD	65	1
Piney Point	California, MD	672	1
Country Lakes	California, MD	3,016	1
B&l Mobile Home Park	Huntingtown, MD	65	1
Fenwick Manor	California, MD	234	1

Large utilities that accumulated/accrued the most violation points as of July 2021 to June 2024 in Maryland

Utility	Location	People Served	Violation Points

City of Havre De Grace	Havre De Grace, MD	14,000	5
Ocean Pines	Berlin, MD	11,890	1
Patuxent Naval Air Station (NAVFAC-WASH)	Patuxent River, MD	22,000	1

Contaminants found in Maryland above health guidelines

	Found above health guidelines		Found
Contaminant	# of Utilities	People Served	# of Utilities	People Served

Total trihalomethanes (TTHMs)	314	5,113,230	314	5,113,230
Haloacetic acids (HAA9)	59	5,069,602	59	5,069,602
Haloacetic acids (HAA5)	273	4,998,276	274	5,028,619
Radium, combined (-226 & -228)	232	4,508,430	249	4,564,427
Bromodichloromethane	155	4,418,651	155	4,418,651
Dibromochloromethane	121	4,383,365	121	4,383,365
Chloroform	161	4,360,133	199	4,473,862
Nitrate	170	4,243,535	187	4,305,821
Nitrate & nitrite	142	4,200,728	157	4,330,458
Chromium (hexavalent)	36	2,622,476	50	4,938,722
Bromochloroacetic acid	12	2,048,866	12	2,048,866
Arsenic	92	429,418	92	429,418
Bromochloromethane	28	234,355	28	234,355
Perfluorooctanoic acid (PFOA)	11	144,318	11	144,318
Perfluorooctane sulfonate (PFOS)	10	139,364	10	139,364
Perfluorohexane sulfonate (PFHXS)	12	139,078	12	139,078
Bromoform	15	104,073	24	2,114,995
Radon	14	72,142	14	72,142
Cadmium	3	39,747	3	39,747
Tetrachloroethylene (perchloroethylene)	6	32,200	6	32,200
1,2,3-Trichloropropane	1	30,343	1	30,343
Chlorate	3	28,776	50	4,973,899
Chloromethane	20	15,997	117	2,074,177
Uranium, combined (pCi/L)	5	14,645	5	14,645
Trichloroethylene	1	1,921	5	24,881
Manganese	1	846	80	5,087,595
Antimony	1	699	5	150,717
Dibromoacetic acid	1	625	1	625
Trichloroacetic acid	1	625	1	625
Dichloroacetic acid	1	625	1	625

Contaminants found in Maryland above legal limits

Contaminant	# of Utilities	People Served

Radium, combined (-226 and -228)		1	1,108
Total trihalomethanes (TTHMs)		1	105

view utility

Carbon Filters

Can reduce the levels of many common contaminants.

pros

Lower upfront cost
Reduced maintenance

cons

Does not remove all contaminants

Reverse Osmosis

Most effective at reducing contaminants.

pros

Most effective

cons

Higher upfront cost
Requires more maintenance
Wastes water

Other Considerations

Ion Exchange

Pros: Softens hard water, Reduces some contaminants

Cons: Doesn't remove all contaminants

Whole-House Filters

Pros: Useful for reducing radiologicals and TCE

Cons: Expensive to install and maintain, Risk of bacterial contamination

Distillation

Pros: Removes heavy metals and harmful microbes

Cons: Does not reduce most contaminants

EWG’s Tap
Water Database

Nitrate in
Tap Water

STATE

Maryland

CONTAMINANTS

94

serves

5,431,000

data

2013-2024

UTILITIES

463

Overview

Large utilities in Maryland

Utilities that accumulated/accrued the most violation points as of July 2021 to June 2024 in Maryland

Large utilities that accumulated/accrued the most violation points as of July 2021 to June 2024 in Maryland

Contaminants found in Maryland above health guidelines

Contaminants found in Maryland above legal limits

What filter type is right for you?

Water
Contaminants

Carbon Filters

Reverse Osmosis

Other Considerations

Ion Exchange

Whole-House Filters

Distillation

Take Action

Need help finding a filter?

We’re in this together

Protect your water

EWG’s TapWater Database

STATE

Maryland

CONTAMINANTS

94

serves

5,431,000

data

2013-2024

UTILITIES

463

Overview

Large utilities in Maryland

Utilities that accumulated/accrued the most violation points as of July 2021 to June 2024 in Maryland

Large utilities that accumulated/accrued the most violation points as of July 2021 to June 2024 in Maryland

Contaminants found in Maryland above health guidelines

Contaminants found in Maryland above legal limits

What filter type is right for you?

WaterContaminants

Carbon Filters

Reverse Osmosis

Other Considerations

Ion Exchange

Whole-House Filters

Distillation

Take Action

Need help finding a filter?

We’re in this together

Protect your water

EWG’s Tap
Water Database

Water
Contaminants