Maryland Drinking Water Compliance Records
464 water systems serving 5,529,590 people. 428 historical EPA violation records in the Q2 2026 snapshot.
TapScore Compliance-History Grades
A
464
100%
B
0
0%
C
0
0%
D
0
0%
F
0
0%
464
Water Systems
5,529,590
Population Served
428
Historical Records
79
Health-Based (All Years)
Systems With the Most Recent EPA Records
TOWN OF SECRETARY
535 served1 historical record
A
HIGHFIELD
1,141 served1 historical record
A
NIELSEN MOBILE HOME PARK [MARSH CREEK]
35 served0 historical records
A
FAHRNEY-KEEDY SENIOR LIVING COMMUNITY
250 served0 historical records
A
WHITE PLAINS 2 MHP/JACK BLAIR
70 served1 historical record
A
WHITE PLAINS 1 MHP/SMITTYS
100 served1 historical record
A
PARIS OAKS / DAYS END
251 served0 historical records
A
SHORES OF CALVERT
361 served1 historical record
A
REGENCY PARK ASSISTED LIVING RESIDENCE
85 served2 historical records
A
BELLEWOOD WATER ASSOCIATION
75 served1 historical record
A
Large Systems With No Recent Records
WASHINGTON SUBURBAN SANITARY COMMISSION
1,900,000 served0 historical records
A
CITY OF BALTIMORE
1,600,000 served2 historical records
A
GLEN BURNIE-BROADNECK
290,606 served2 historical records
A
HOWARD COUNTY D.P.W. DISTRIBUTION
286,158 served2 historical records
A
HARFORD COUNTY D.P.W.
104,567 served1 historical record
A
CITY OF HAGERSTOWN
92,200 served1 historical record
A
WALDORF - CHARLES COUNTY DPW
84,296 served1 historical record
A
NEW DESIGN - FREDERICK COUNTY
74,911 served1 historical record
A
CROFTON-ODENTON
62,986 served0 historical records
A
FORT GEORGE G. MEADE
62,234 served1 historical record
A
Largest Water Systems in Maryland
| Water System | Grade | Population | Historical Records |
|---|---|---|---|
| WASHINGTON SUBURBAN SANITARY COMMISSION | A | 1,900,000 | 0 |
| CITY OF BALTIMORE | A | 1,600,000 | 2 |
| GLEN BURNIE-BROADNECK | A | 290,606 | 2 |
| HOWARD COUNTY D.P.W. DISTRIBUTION | A | 286,158 | 2 |
| HARFORD COUNTY D.P.W. | A | 104,567 | 1 |
| CITY OF HAGERSTOWN | A | 92,200 | 1 |
| WALDORF - CHARLES COUNTY DPW | A | 84,296 | 1 |
| NEW DESIGN - FREDERICK COUNTY | A | 74,911 | 1 |
| CROFTON-ODENTON | A | 62,986 | 0 |
| FORT GEORGE G. MEADE | A | 62,234 | 1 |
| CITY OF FREDERICK | A | 54,000 | 2 |
| CITY OF ROCKVILLE | A | 52,000 | 1 |
| LEXINGTON PARK | A | 43,030 | 0 |
| CITY OF WESTMINSTER | A | 35,256 | 2 |
| CITY OF ANNAPOLIS | A | 35,000 | 0 |
| CITY OF SALISBURY | A | 30,343 | 1 |
| TOWN OF OCEAN CITY | A | 30,000 | 1 |
| CITY OF CUMBERLAND | A | 27,039 | 2 |
| BROAD CREEK | A | 26,033 | 0 |
| CITY OF BOWIE | A | 25,000 | 0 |
Contaminants in Maryland
Lead in MarylandArsenic in MarylandNitrate in MarylandFluoride in MarylandPFOS in MarylandPFOA in MarylandTHMs in MarylandHAA5 in Maryland
Cities in Maryland
LAUREL(1)BALTIMORE(8)MILLERSVILLE(8)COLUMBIA(2)FREDERICK(19)ABINGDON(1)HAGERSTOWN(6)WESTMINSTER(6)FORT MEADE(1)CALIFORNIA(28)ANNAPOLIS(4)CUMBERLAND(5)ABERDEEN(2)SALISBURY(8)OCEAN CITY(4)BOWIE(1)BERLIN(10)PATUXENT RIVER(1)ELKTON(6)BEL AIR(2)EASTON(2)CAMBRIDGE(3)HAVRE DE GRACE(3)PRINCE FREDERICK(17)STEVENSVILLE(9)LA PLATA(8)FROSTBURG(1)MOUNT AIRY(3)NORTH EAST(3)LUSBY(2)INDIAN HEAD(4)DUNKIRK(5)NEWARK(9)CHESTERTOWN(7)WALKERSVILLE(1)BRUNSWICK(1)TANEYTOWN(1)HAMPSTEAD(1)FRUITLAND(5)OAKLAND(7)THURMONT(1)POOLESVILLE(1)LAVALE(1)LEONARDTOWN(2)LONACONING(2)DELMAR(5)CHESAPEAKE BEACH(1)MANCHESTER(1)EMMITSBURG(2)DENTON(3)BOONSBORO(3)PERRYVILLE(3)MIDDLETOWN(2)WILLIAMSPORT(4)POCOMOKE CITY(1)PRINCESS ANNE(2)WILLARDS(1)SMITHSBURG(2)LOTHIAN(5)WALDORF(18)CENTREVILLE(1)NORTH BEACH(1)CHRISFIELD(1)ST MICHAELS(1)FEDERALSBURG(3)SEVERN(2)SNOW HILL(1)WESTERNPORT(1)HURLOCK(1)PERRY POINT(1)ST. LEONARD(1)SYKESVILLE(2)HANCOCK(1)GREENSBORO(2)RIDGELY(2)ROCK HALL(1)NEW WINDSOR(1)MYERSVILLE(1)PITTSVILLE(1)PORT REPUBLIC(1)TIMONIUM(2)FUNKSTOWN(1)SHERWOOD FOREST(1)PORT DEPOSIT(7)JESSUP(3)HEBRON(1)UNION BRIDGE(1)FARMINGTON HILLS(3)LEXINGTON PARK(1)GRANTSVILLE(1)WOODSBORO(1)TYSONS(2)GLEN ARM(2)OXFORD(2)BRANDYWINE(1)PRESTON(1)QUEENSTOWN(1)ST. MICHAELS(1)CHESAPEAKE CITY(1)ELLICOTT CITY(5)