Maryland Water Systems

Compiled by PlainEnviro · August 25, 2026

481 community water systems in Maryland, ranked by violation count. Data from EPA Safe Drinking Water Information System (SDWIS).

Water Systems

481

Health-Based Violation Records

556

Health Violations

187 systems

Population Served

5,529,391

Maryland community water systems are regulated by the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act; each utility files compliance results with the state's primacy agency and, for federally listed contaminants, with the U.S. Environmental Protection Agency directly. PlainEnviro's health-based SDWIS extract above counts health-based exceedances only -- monitoring and reporting violations are not present in these figures.

Violation counts reflect both infrastructure realities and reporting diligence, a state with more small rural systems will accumulate more monitoring-type violations without necessarily delivering worse water. Health-based violations are the stronger safety signal. A past violation does not itself indicate current unsafe water; utilities must notify customers, remediate, and publish an annual Consumer Confidence Report. All numbers below draw directly from the federal SDWIS record.

Which water systems have violations? (187)

#	System Name	City	Source	Violations	Pop. Served	Health
1	ECHO VALLEY MHP North East	North East	Groundwater	41	60	Yes
2	TOWN OF NORTH EAST North East	North East	Surface Water	26	8,600	Yes
3	SPRINGFIELD HOSPITAL DISTRIBUTION Sykesville	Sykesville	Surface Water	22	1,500	Yes
4	GOLDEN KAY APARTMENTS Elkton	Elkton	Groundwater	21	148	Yes
5	TOWN OF PERRYVILLE Perryville	Perryville	Surface Water	16	4,413	Yes
6	PHELPS MOBILE HOME VILLA Gaithersburg	Gaithersburg	Groundwater	14	98	Yes
7	CITY OF HAVRE DE GRACE Havre De Grace	Havre De Grace	Surface Water	10	14,000	Yes
8	CITY OF POCOMOKE CITY Pocomoke City	Pocomoke City	Groundwater	9	4,100	Yes
9	TOWN OF ST. MICHAELS St Michaels	St Michaels	Groundwater	8	2,650	Yes
10	TOWN OF SNOW HILL Snow Hill	Snow Hill	Groundwater	8	2,409	Yes
11	PERRY POINT V.A. MEDICAL CENTER Perry Point	Perry Point	Surface Water	8	2,000	Yes
12	GLEN MEADOWS RETIREMENT COMMUNITY Glen Arm	Glen Arm	Surface Water	8	468	Yes
13	CEDAR MOBILE HOME PARK Columbia	Columbia	Groundwater	8	300	Yes
14	RIDGEVIEW MHP Rising Sun	Rising Sun	Groundwater	8	55	Yes
15	FREEDOM DISTRICT Westminster	Westminster	Surface Water	7	24,867	Yes
16	IRISH CREEK MHP Ellicott City	Ellicott City	Groundwater	7	90	Yes
17	TEBBSTON ON MAGOTHY Westminster	Westminster	Groundwater	7	52	Yes
18	TOWN OF BETTERTON Betterton	Betterton	Groundwater	6	481	Yes
19	FORT DETRICK Frederick	Frederick	Surface Water	5	7,900	Yes
20	MIDLAND-LONACONING Lonaconing	Lonaconing	Surface Water	5	5,000	Yes
21	RELIANCE MOBILE HOME PARK	-	Groundwater	5	200	Yes
22	NAYLOR MILL VILLAGE MOBILE HOME PARK Fruitland	Fruitland	Groundwater	5	180	Yes
23	CHRISTMAS TREE FARM TRAILER PARK Leonardtown	Leonardtown	Groundwater	5	100	Yes
24	LIBERTY MOBILE HOME PARK Federalsburg	Federalsburg	Groundwater	5	40	Yes
25	COUNTRY VILLAGE MOBILE HOME PARK Clarksburg	Clarksburg	Groundwater	5	38	Yes
26	WHITE OAK MOBILE HOME PARK Swanton	Swanton	Groundwater	5	32	Yes
27	HYDETOWN PARK EAST White Hall	White Hall	Groundwater	5	29	Yes
28	CITY OF BALTIMORE Baltimore	Baltimore	Surface Water	4	1,600,000	Yes
29	CITY OF WESTMINSTER Westminster	Westminster	Surface Water	4	35,256	Yes
30	TOWN OF CECILTON Cecilton	Cecilton	Groundwater	4	477	Yes
31	THE OAKS OF THONOTOSASSA MHP Potomac	Potomac	Groundwater	4	330	Yes
32	BAY COUNTRY ESTATES MOBILE HOME PARK Rising Sun	Rising Sun	Groundwater	4	276	Yes
33	CEDARHURST MOBILE HOME PARK Salisbury	Salisbury	Groundwater	4	220	Yes
34	VILLAGE GREEN MOBILE HOME PARK Crofton	Crofton	Surface Water	4	188	Yes
35	BROOK LANE HEALTH SERVICES	-	Groundwater	4	175	Yes
36	REGENCY PARK ASSISTED LIVING RESIDENCE Gambrills	Gambrills	Groundwater	4	85	Yes
37	GILBERTS MOBILE HOME PARK Middletown	Middletown	Groundwater	4	75	Yes
38	HOLLY COVE HARBOR MOBILE HOME PARK Federalsburg	Federalsburg	Groundwater	4	45	Yes
39	PINEY CREEK CORPORATION Chester	Chester	Groundwater	4	31	Yes
40	LAVALE SANITARY COMMISSION Lavale	Lavale	Surface Water	3	5,500	Yes
41	TOWN OF WESTERNPORT Westernport	Westernport	Surface Water	3	2,200	Yes
42	TOWN & COUNTRY MOBILE HOME PARK North East	North East	Groundwater	3	950	Yes
43	CLOVERHILL 3 - CONSECUTIVE TO MD0100015 Frederick	Frederick	Surface Water	3	888	Yes
44	TOWN OF PRESTON Preston	Preston	Groundwater	3	750	Yes
45	TOWN OF SHARPTOWN Sharptown	Sharptown	Groundwater	3	625	Yes
46	THE CALVERTON SCHOOL Huntingtown	Huntingtown	Groundwater	3	461	Yes
47	WEST NOTTINGHAM ACADEMY Colora	Colora	Groundwater	3	250	Yes
48	SAINT JAMES SCHOOL Hagerstown	Hagerstown	Surface Water	3	200	Yes
49	WOODBINE VILLAGE MOBILE HOME PARK Potomac	Potomac	Groundwater	3	150	Yes
50	ROCKBROOK VILLAGE MOBILE HOME PARK Ellicott City	Ellicott City	Groundwater	3	150	Yes
51	BEAN CREEK RESORT Gaithersburg	Gaithersburg	Groundwater	3	112	Yes
52	INDEPENDENCE VILLAGE Charlotte Hall	Charlotte Hall	Groundwater	3	88	Yes
53	BOH-NAK MOBILE HOME PARK Fruitland	Fruitland	Groundwater	3	85	Yes
54	SULLIVANS MOBILE HOME PARK COMMUNITY Ellicott City	Ellicott City	Groundwater	3	70	Yes
55	PLEASANT HILL MOBILE HOME PARK Childs	Childs	Groundwater	3	64	Yes
56	BENNETT MOBILE HOME PARK Delmar	Delmar	Groundwater	3	60	Yes
57	CITY OF BOWIE Bowie	Bowie	Groundwater	2	25,000	Yes
58	TOWN OF ELKTON Elkton	Elkton	Surface Water	2	15,625	Yes
59	TOWN OF LEONARDTOWN Leonardtown	Leonardtown	Groundwater	2	5,000	Yes
60	TOWN OF MIDDLETOWN Middletown	Middletown	Groundwater	2	4,288	Yes
61	TOWN OF CHARLESTOWN Willards	Willards	Groundwater	2	3,791	Yes
62	TOWN OF CENTREVILLE Centreville	Centreville	Groundwater	2	3,322	Yes
63	TOWN OF NORTH BEACH North Beach	North Beach	Groundwater	2	3,000	Yes
64	TOWN OF MOUNTAIN LAKE PARK Oakland	Oakland	Groundwater	2	3,000	Yes
65	TOWN OF EMMITSBURG Emmitsburg	Emmitsburg	Surface Water	2	2,921	Yes
66	TOWN OF HURLOCK Hurlock	Hurlock	Groundwater	2	2,150	Yes
67	TOWN OF FRIENDSVILLE Oakland	Oakland	Surface Water	2	622	Yes
68	KESWICK MULTI-CARE CENTER Baltimore	Baltimore	Surface Water	2	575	Yes
69	TOWN OF GALENA Chestertown	Chestertown	Groundwater	2	560	Yes
70	CRYSTAL BEACH MANOR/T&C UTILITY Timonium	Timonium	Groundwater	2	500	Yes
71	TOWN OF CLEAR SPRING Williamsport	Williamsport	Surface Water	2	455	Yes
72	BONNIE BROOK Cambridge	Cambridge	Groundwater	2	390	Yes
73	BENEDICTINE SCHOOL Ridgely	Ridgely	Groundwater	2	300	Yes
74	SHERWOOD FOREST/FOREST VIEW VILLAGE MHP Elkton	Elkton	Groundwater	2	293	Yes
75	TOWN OF DEER PARK Oakland	Oakland	Groundwater	2	272	Yes
76	FAIRGROVE MHP Bethesda	Bethesda	Groundwater	2	244	Yes
77	MEADOW BROOK M H P Perryville	Perryville	Groundwater	2	224	Yes
78	MAPLE HILL MOBILE ESTATES Port Deposit	Port Deposit	Groundwater	2	180	Yes
79	LANGLEY MOBILE HOME PARK Linthicum Heights	Linthicum Heights	Groundwater	2	175	Yes
80	VILLAS AT CATTAIL CREEK Reistertown	Reistertown	Groundwater	2	170	Yes
81	TURKEY HILL WATER COMPANY La Plata	La Plata	Groundwater	2	150	Yes
82	MOUNT PLEASANT WATER CO., INC. Waldorf	Waldorf	Groundwater	2	150	Yes
83	BARRELVILLE Mt. Savage	Mt. Savage	Groundwater	2	130	Yes
84	CHAPEL HILL NURSING CENTER Randalstown	Randalstown	Groundwater	2	125	Yes
85	TRANQUILITY AT FREDERICKTOWNE Frederick	Frederick	Surface Water	2	105	Yes
86	R & R ESTATES Darlington	Darlington	Groundwater	2	96	Yes
87	HARBOUR LIGHT ESTATES COMMUNITY Salisbury	Salisbury	Groundwater	2	95	Yes
88	PINE TREE MOBILE HOME PARK Parsonsburg	Parsonsburg	Groundwater	2	91	Yes
89	LAKEVIEW MHP LLC Ellicott City	Ellicott City	Groundwater	2	76	Yes
90	DEEP ROOTS INC. Earleville	Earleville	Groundwater	2	60	Yes
91	THUNDERBIRD MOTEL Newburg	Newburg	Groundwater	2	60	Yes
92	CLAIBORNE Claiborne	Claiborne	Groundwater	2	60	Yes
93	MAYO CENTER AND APARTMENTS Annapolis	Annapolis	Groundwater	2	60	Yes
94	OAK LANE MOBILE HOME PARK Port Deposit	Port Deposit	Groundwater	2	55	Yes
95	WOODLAWN MOBILE HOME PARK - OLD Port Deposit	Port Deposit	Groundwater	2	50	Yes
96	LAUREL WATER SUPPLY	-	Groundwater	2	50	Yes
97	GOLDEN ACRES MOBILE HOME PARK Landover	Landover	Groundwater	2	48	Yes
98	CEDAR RIDGE CHILDREN'S HOME & SCHOOL Williamsport	Williamsport	Surface Water	2	45	Yes
99	THUNDERBIRD APARTMENTS Waldorf	Waldorf	Groundwater	2	40	Yes
100	NIELSEN MOBILE HOME PARK [MARSH CREEK] Easton	Easton	Groundwater	2	35	Yes
101	CHESTNUT POINT ESTATES DISTRIBUTION SYS. Perryville	Perryville	Groundwater	2	32	Yes
102	WOODLAND BEACH COMMUNITY ASSOC. Severn	Severn	Groundwater	2	26	Yes
103	FOUR SEASONS PARK INC. Ocean City	Ocean City	Groundwater	2	25	Yes
104	GLEN BURNIE-BROADNECK Millersville	Millersville	Groundwater	1	290,606	Yes
105	CITY OF HAGERSTOWN Hagerstown	Hagerstown	Surface Water	1	92,200	Yes
106	FORT GEORGE G. MEADE Fort Meade	Fort Meade	Groundwater	1	62,234	Yes
107	CITY OF FREDERICK Frederick	Frederick	Surface Water	1	54,000	Yes
108	TOWN OF OCEAN CITY Ocean City	Ocean City	Groundwater	1	30,000	Yes
109	CITY OF BRUNSWICK Brunswick	Brunswick	Surface Water	1	7,312	Yes
110	TOWN OF THURMONT Thurmont	Thurmont	Surface Water	1	6,200	Yes
111	TOWN OF CHESTERTOWN Chestertown	Chestertown	Groundwater	1	5,400	Yes
112	EASTERN CORRECTIONAL INSTITUTE	-	Groundwater	1	3,500	Yes
113	TOWN OF PRINCESS ANNE Princess Anne	Princess Anne	Groundwater	1	3,300	Yes
114	WAKEFIELD VALLEY Westminster	Westminster	Surface Water	1	2,436	Yes
115	TOWN OF RISING SUN Elkton	Elkton	Surface Water	1	2,200	Yes
116	SAINT MARYS COLLEGE Millersville	Millersville	Groundwater	1	2,200	Yes
117	TOWN OF PITTSVILLE Pittsville	Pittsville	Groundwater	1	1,500	Yes
118	TOWN OF UNION BRIDGE Union Bridge	Union Bridge	Surface Water	1	997	Yes
119	HOLIDAY MOBILE ESTATES, INC. Jessup	Jessup	Groundwater	1	900	Yes
120	LORD CALVERT TRAILER PARK Lexington Park	Lexington Park	Groundwater	1	892	Yes
121	BEACH HARBOR Grasonville	Grasonville	Groundwater	1	481	Yes
122	GAITHER MANOR APARTMENTS Sykesville	Sykesville	Groundwater	1	450	Yes
123	STONEY CHASE/ ROCK CREEK M.H.P.S Elkton	Elkton	Groundwater	1	396	Yes
124	SUMMERHILL MOBILE HOME PARK Glen Arm	Glen Arm	Groundwater	1	350	Yes
125	CHELTENHAM BOYS VILLAGE	-	Groundwater	1	330	Yes
126	LUTHERAN VILLAGE AT MILLER'S GRANT Ellicott City	Ellicott City	Surface Water	1	315	Yes
127	MIDLOTHIAN WATER COMPANY Midlothian	Midlothian	Groundwater	1	300	Yes
128	PHEASANT RIDGE ESTATES Mount Airy	Mount Airy	Groundwater	1	300	Yes
129	LODGECLIFFE DISTRIBUTION SYSTEM Cambridge	Cambridge	Groundwater	1	300	Yes
130	AUTUMN LAKE HEALTHCARE Rising Sun	Rising Sun	Groundwater	1	290	Yes
131	CHARLOTTE HALL VA HOME	-	Groundwater	1	270	Yes
132	FAHRNEY-KEEDY SENIOR LIVING COMMUNITY Boonsboro	Boonsboro	Surface Water	1	250	Yes
133	REX HILL ESTATES, LLC Crofton	Crofton	Groundwater	1	246	Yes
134	CRELLIN Oakland	Oakland	Groundwater	1	230	Yes
135	REGENCY MANOR MOBILE HOME PARK Lothian	Lothian	Groundwater	1	224	Yes
136	WALSTONS MOBILE HOME PARK Salisbury	Salisbury	Groundwater	1	165	Yes
137	THE NEIGHBORHOODS AT ST. ELIZABETH Baltimore	Baltimore	Surface Water	1	162	Yes
138	PINE SPRINGS MHP	-	Groundwater	1	160	Yes
139	LONDONDERRY COURT MHP North East	North East	Surface Water	1	160	Yes
140	RIO VISTA PLAZA MOBILE HOME PARK Baltimore	Baltimore	Groundwater	1	150	Yes
141	PLEASANT VALLEY Westminster	Westminster	Groundwater	1	150	Yes
142	DU MAR ESTATES WATER COMPANY Marbury	Marbury	Groundwater	1	150	Yes
143	POMFRET ESTATES - UTILCO, INC. Waldorf	Waldorf	Groundwater	1	150	Yes
144	CONCORD ESTATES MOBILE HOME PARK Hagerstown	Hagerstown	Groundwater	1	150	Yes
145	ST. MARTINS BY THE BAY Berlin	Berlin	Groundwater	1	120	Yes
146	PLEASANT VIEW NURSING HOME Mount Airy	Mount Airy	Groundwater	1	104	Yes
147	GREEN RIDGE BOYS CAMP Cascade	Cascade	Groundwater	1	100	Yes
148	HILL WATERWORKS COOPERATIVE Tylerton	Tylerton	Groundwater	1	100	Yes
149	RHODES POINT SOUTH WATERWORKS Tylerton	Tylerton	Groundwater	1	100	Yes
150	TYLERTON WATERWORK COOPERATIVE Tylerton	Tylerton	Groundwater	1	100	Yes
151	FOX RUN CONDOMINIUMS, INC. Sunderland	Sunderland	Groundwater	1	85	Yes
152	RESERVOIR TRAILER PARK Finksburg	Finksburg	Groundwater	1	79	Yes
153	BELLEWOOD WATER ASSOCIATION Waldorf	Waldorf	Groundwater	1	75	Yes
154	BAYVIEW AT KENT NARROWS Grasonville	Grasonville	Groundwater	1	75	Yes
155	EWELL WATERWORKS COOPERATIVE Tylerton	Tylerton	Groundwater	1	75	Yes
156	BERKELEY SPRINGS MHC Gaithersburg	Gaithersburg	Groundwater	1	69	Yes
157	BEST RENTAL HOUSING, INC. Ocean Pines	Ocean Pines	Groundwater	1	68	Yes
158	HILLTOP TRAILER PARK Denton	Denton	Groundwater	1	65	Yes
159	B&L MOBILE HOME PARK Huntingtown	Huntingtown	Groundwater	1	65	Yes
160	PINE TRAILER PARK Lusby	Lusby	Groundwater	1	65	Yes
161	MEADOW MOUNTAIN BOYS CAMP	-	Groundwater	1	63	Yes
162	BACKBONE MOUNTAIN BOYS CAMP	-	Groundwater	1	60	Yes
163	QUEENS CASTLE MOBILE HOME PARK Darlington	Darlington	Groundwater	1	60	Yes
164	GARDEN ESTATES CENTRAL WATER La Plata	La Plata	Groundwater	1	55	Yes
165	FOUNTAIN GREEN MOBILE HOME PARK Havre De Grace	Havre De Grace	Groundwater	1	55	Yes
166	TWIN ARCH MOBILE HOME PARK Stevensville	Stevensville	Groundwater	1	50	Yes
167	BAYSIDE VILLAGE Salisbury	Salisbury	Groundwater	1	50	Yes
168	SUNSET LAKES LLC Berlin	Berlin	Groundwater	1	48	Yes
169	GARRETT CHILDREN'S CENTER Lonaconing	Lonaconing	Groundwater	1	45	Yes
170	SWANN HAVEN MOBILE HOME PARK Chester	Chester	Groundwater	1	44	Yes
171	GRAMERCY LLC (AKA KOINONIA PARTNERSHIP ) Stevenson	Stevenson	Groundwater	1	40	Yes
172	TOWER COURT MOBILE HOME PARK Denton	Denton	Groundwater	1	40	Yes
173	NORTHFIELD APARTMENTS Salisbury	Salisbury	Groundwater	1	40	Yes
174	BB APARTMENTS (PREV WOC VILLAGE APTS) Ocean City	Ocean City	Groundwater	1	40	Yes
175	PIN OAK APARTMENTS Berlin	Berlin	Groundwater	1	40	Yes
176	ANGELICA NURSERIES - NURSERY VIEW Kennedyville	Kennedyville	Groundwater	1	38	Yes
177	HART HERITAGE Street	Street	Groundwater	1	37	Yes
178	AMELANO MANOR Frederick	Frederick	Groundwater	1	36	Yes
179	WILLIAMS MOBILE HOME PARK Severna Park	Severna Park	Groundwater	1	35	Yes
180	MIDTOWN WATERWORKS COOPERATIVE Tylerton	Tylerton	Groundwater	1	34	Yes
181	ROCKY GAP MOBILE HOME PARK Rawlings	Rawlings	Groundwater	1	30	Yes
182	OAK TERRACE MOBILE HOME PARK LLC Salisbury	Salisbury	Groundwater	1	30	Yes
183	CLEAR VIEW MOBILE HOME PARK LLC Darlington	Darlington	Groundwater	1	28	Yes
184	TAYLORS MOBILE HOME PARK Greensboro	Greensboro	Groundwater	1	27	Yes
185	GRAYMOUNT APARTMENTS Perryville	Perryville	Groundwater	1	27	Yes
186	HYDETOWN PARK WEST White Hall	White Hall	Groundwater	1	26	Yes
187	CHURCH HILL CONDO, INC. (THE POND) Church Hill	Church Hill	Groundwater	1	25	Yes

Systems with No Violations (294)

294 water systems in Maryland have zero recorded violations. Showing the 50 largest by population served.

WASHINGTON SUBURBAN SANITARY COMMISSION (1,900,000) HOWARD COUNTY D.P.W. DISTRIBUTION (286,158) HARFORD COUNTY D.P.W. (104,567) WALDORF - CHARLES COUNTY DPW (84,296) NEW DESIGN - FREDERICK COUNTY (74,911) CROFTON-ODENTON (62,986) CITY OF ROCKVILLE (52,000) LEXINGTON PARK (43,030) CITY OF ANNAPOLIS (35,000) CITY OF SALISBURY (30,343) CITY OF CUMBERLAND (27,039) BROAD CREEK (26,033) PATUXENT NAVAL AIR STATION (NAVFAC-WASH) (22,000) CITY OF ABERDEEN (18,006) EASTON UTILITIES (17,357) CITY OF CAMBRIDGE WATER (15,000) CHAPEL HILL - ABERDEEN PROVING GROUNDS (15,000) MARYLAND AMERICAN WATER COMPANY (13,200) OCEAN PINES (11,890) TOWN OF LA PLATA (11,535) CITY OF FROSTBURG (11,000) TOWN OF MOUNT AIRY (9,890) CHESAPEAKE RANCH ESTATES (9,500) STEVENSVILLE (9,155) U.S. NAVAL ACADEMY (8,700) TOWN OF WALKERSVILLE (8,440) CITY OF TANEYTOWN (6,750) TOWN OF HAMPSTEAD (6,600) BRYANS ROAD (6,260) TOWN OF POOLESVILLE (6,005) MYSTIC HARBOUR (5,945) CITY OF FRUITLAND (5,907) EASTERN REGION ALLEGANY DISTRIB. SYSTEM (5,703) DEEP CREEK LAKE WATER SERVICE AREA (5,502) MARYLAND AMERICAN WATER--SEVERN SYSTEM (5,447) TOWN OF CHESAPEAKE BEACH (5,000) WESTERN REGION ALLEGANY DISTRIB. SYSTEM (4,955) TOWN OF MANCHESTER (4,954) TOWN OF DENTON (4,500) TOWN OF DELMAR (4,500) TOWN OF BERLIN (4,500) PRINCE FREDERICK (4,371) BOONSBORO - KEEDYSVILLE (4,250) TOWN OF INDIAN HEAD (4,100) THE PROVINCES (3,991) SOLOMONS (3,811) NAVAL SUPPORT FACILITY, INDIAN HEAD (3,321) COUNTRY LAKES (3,016) CITY OF CRISFIELD (2,976) CEDAR COVE (2,728) +244 more

All Water Systems in Maryland (481)

Page 2 of 10, ordered by population served.

System	Population Served	Violations
MARYLAND AMERICAN WATER--SEVERN SYSTEM	5,447	0
TOWN OF CHESTERTOWN	5,400	1
MIDLAND-LONACONING	5,000	5
TOWN OF CHESAPEAKE BEACH	5,000	0
TOWN OF LEONARDTOWN	5,000	2
WESTERN REGION ALLEGANY DISTRIB. SYSTEM	4,955	0
TOWN OF MANCHESTER	4,954	0
TOWN OF DENTON	4,500	0
TOWN OF DELMAR	4,500	0
TOWN OF BERLIN	4,500	0
TOWN OF PERRYVILLE	4,413	16
PRINCE FREDERICK	4,371	0
TOWN OF MIDDLETOWN	4,288	2
BOONSBORO - KEEDYSVILLE	4,250	0
TOWN OF INDIAN HEAD	4,100	0
CITY OF POCOMOKE CITY	4,100	9
THE PROVINCES	3,991	0
SOLOMONS	3,811	0
TOWN OF CHARLESTOWN	3,791	2
EASTERN CORRECTIONAL INSTITUTE	3,500	1
TOWN OF CENTREVILLE	3,322	2
NAVAL SUPPORT FACILITY, INDIAN HEAD	3,321	0
TOWN OF PRINCESS ANNE	3,300	1
COUNTRY LAKES	3,016	0
TOWN OF NORTH BEACH	3,000	2
TOWN OF MOUNTAIN LAKE PARK	3,000	2
CITY OF CRISFIELD	2,976	0
TOWN OF EMMITSBURG	2,921	2
CEDAR COVE	2,728	0
TOWN OF ST. MICHAELS	2,650	8
BEL AIR - PINTO DISTRIBUTION SYSTEM	2,614	0
FOUNTAINDALE SOUTH	2,610	0
TOWN OF SMITHSBURG DISTRIBUTION SYSTEM	2,500	0
TOWN OF FEDERALSBURG	2,450	0
WAKEFIELD VALLEY	2,436	1
TOWN OF SNOW HILL	2,409	8
LAKE VILLAGE TOWNHOMES	2,400	0
TOWN OF WILLIAMSPORT DISTRIBUTION SYSTEM	2,400	0
GREENRIDGE SUBDIVISION	2,271	0
HERALD HARBOR	2,241	0
TOWN OF WESTERNPORT	2,200	3
TOWN OF RISING SUN	2,200	1
SAINT MARYS COLLEGE	2,200	1
TOWN OF HURLOCK	2,150	2
JOHNS HOPKINS UNIVERSITY	2,058	0
DELMAR UTILITY COMM (TN OF DELMAR)	2,027	0
BEACHES WATER CO-OPERATIVE	2,000	0
PERRY POINT V.A. MEDICAL CENTER	2,000	8
TOWN OF HANCOCK	1,921	0
MOUNT SAINT MARYS UNIVERSITY	1,900	0

← Previous Page 2 of 10 Next →

Frequently Asked Questions

How many water systems are in Maryland?

Maryland has 481 community water systems tracked by the EPA, serving a combined population of 5,529,391 people.

How many water systems in Maryland have health violations?

187 water systems in Maryland have health-based violations, which include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations. These represent 39% of all systems in the state.

How many health-based violation records are in this extract for Maryland?

PlainEnviro's health-based EPA SDWIS extract contains 556 records joined to 481 active community water systems in Maryland. Monitoring and reporting records are not included.

Explore More

Maryland Water Quality → Maryland Environmental Overview → All States →

Other States

AL AK AS AZ AR CA CO CT DE DC FL GA GU HI ID IL IN IA KS KY LA ME MA MI MN MS MO MT NE NV NH NJ NM NY NC ND MP OH OK OR PA PR RI SC SD TN TX VI UT VT VA WA WV WI WY

About This Data

Water system data is from the EPA Safe Drinking Water Information System (SDWIS). Health-based violations include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations that may pose a direct risk to public health. Only community water systems (CWS) are included.

Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services

Read our methodology - how this data is sourced, computed, and verified.

Browse all → | Rankings →