Maryland

465 Utilities
Serving: 5,327,000
Data available: 2014-2019
Contaminants Found: 90

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

Below are utilities in Maryland serving over 10,000 people, listed alphabetically. Click the "more" button below to get the full list of utilities serving over 10,000 people.

Large utilities in Maryland

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	Cumberland, MD	27,039
City of Frederick	Frederick, MD	54,000
City of Frostburg	Frostburg, MD	11,000
City of Hagerstown	Hagerstown, MD	88,000
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	16,118
Fort George G. Meade	Fort Meade, MD	62,234
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	247,000
Lexington Park	Hollywood, 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	Ocean City, MD	30,000
Waldorf	La Plata, MD	82,731

Utilities that accumulated/accrued the most violation points as of April 2019 to March 2021 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
Sunset Lakes Mobile Home Park	Berlin, MD	48	9
Chapel Hill Nursing Center	Randallstown, MD	125	7
Town of Cecilton	Cecilton, MD	477	6
Town of Snow Hill	Princess Anne, MD	2,409	5
Reliance Mobile Home Park	Denton, MD	200	5
Fort Detrick	Frederick, MD	7,900	5
Pine Hills	Newark, MD	953	5
Apostolic Towers	Baltimore, MD	200	4
Claiborne	Claiborne, MD	60	3
Hart Heritage	Street, MD	37	3
Perry Point V.a. Medical Center	Perry Point, MD	2,000	2
Taylors Mobile Home Park	Greensboro, MD	27	2
Barrelville	Mt. Savage, MD	130	2
Cook's Trailer Court (aka Garrett Tp)	Hollywood, MD	120	2
Graymount Apartments	Perryville, MD	27	2
The Neighborhoods At St. Elizabeth	Baltimore, MD	162	2
Idlewood Park	Crofton, MD	320	1
Town of Rising Sun	Rising Sun, MD	2,200	1
Swan Point	La Plata, MD	945	1
Town of Middletown	Middletown, MD	4,288	1
New Design - Frederick County	Frederick, MD	49,200	1
Christmas Tree Farm Trailer Park	Leonardtown, MD	100	1
Sandy Hook	Williamsport, MD	220	1
Town of Delmar	Delmar, MD	4,500	1
Phoenix	Baltimore, MD	31	1
Tebbston On Magothy	Columbia, MD	52	1
Lyons Creek Estates	Crofton, MD	750	1
Maryland Manor Mobile Home Park	Bethesda, MD	810	1
Patuxent Mobile Estates	Lothian, MD	450	1
Summerhill Mobile Home Park	Crownsville, MD	350	1

Large utilities that accumulated/accrued the most violation points as of April 2019 to March 2021 in Maryland

Utility	Location	People Served	Violation Points
New Design - Frederick County	Frederick, MD	49,200	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)		379	5,314,686			379	5,314,686
Haloacetic acids (HAA5)		283	5,240,720			284	5,275,720
Chromium (hexavalent)		50	4,813,437			53	4,853,964
Haloacetic acids (HAA9)		48	4,802,477			61	4,985,854
Nitrate		181	4,457,648			200	4,794,833
Nitrate and nitrite		115	4,343,149			117	4,343,440
Chloroform		213	2,749,310			216	2,765,114
Radium, combined (-226 & -228)		167	2,721,021			168	2,721,065
Bromodichloromethane		177	2,711,428			177	2,711,428
Dibromochloromethane		162	2,644,344			162	2,644,344
Cadmium		9	334,927			9	334,927
Chlorate		12	245,001			53	4,891,260
Arsenic		95	204,873			95	204,873
Uranium		8	158,273			8	158,273
Perfluorooctanoic acid (PFOA)		4	116,538			4	116,538
Radon		27	102,223			27	102,223
Dichloroacetic acid		14	53,577			14	53,577
Trichloroacetic acid		14	53,577			14	53,577
Bromoform		36	52,608			57	254,454
Tetrachloroethylene (perchloroethylene)		6	43,890			6	43,890
Benzo[a]pyrene		6	36,733			6	36,733
1,2,3-Trichloropropane		2	30,843			2	30,843
Chloromethane		24	17,622			70	1,808,908
Thallium		2	12,390			2	12,390
Dibromoacetic acid		5	9,868			6	25,493
1,2-Dibromo-3-chloropropane (DBCP)		2	7,936			3	38,279
Atrazine		1	6,200			19	2,364,591
Bromochloroacetic acid		1	3,500			1	3,500
Perfluorononanoic acid (PFNA)		1	3,500			1	3,500
Perfluoroheptanoic acid (PFHPA)		1	3,500			1	3,500
Trichloroethylene		1	1,921			3	8,621
Antimony		1	945			3	1,697
Endrin		1	672			1	672
Carbon tetrachloride		1	600			1	600
Heptachlor epoxide		1	600			1	600
Di(2-ethylhexyl) phthalate		1	100			8	11,964

Contaminants found in Maryland above legal limits

Contaminant	People Served
Endrin	1	672
Total trihalomethanes (TTHMs)	1	492
Radium, combined (-226 & -228)	1	26

Maryland

465 Utilities

Serving: 5,327,000

Data available: 2014-2019

Contaminants Found: 90

Large utilities in Maryland

Utilities that accumulated/accrued the most violation points as of April 2019 to March 2021 in Maryland

Large utilities that accumulated/accrued the most violation points as of April 2019 to March 2021 in Maryland

Contaminants found in Maryland above health guidelines

Contaminants found in Maryland above legal limits