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Maryland Water Quality
3,215 public water systems serving 6,070,211 people.
Water Systems
3,215
Total Violations
60,496
Violation Rate
79.9%
PFAS Detection
60.2%
50 of 83 tested
Largest Water Systems
WASHINGTON SUBURBAN SANITARY COMMISSION
LAUREL, MD · 1,900,000 served
CITY OF BALTIMORE
BALTIMORE, MD · 1,600,000 served
GLEN BURNIE-BROADNECK
MILLERSVILLE, MD · 290,606 served
HOWARD COUNTY D.P.W. DISTRIBUTION
COLUMBIA, MD · 286,158 served
HARFORD COUNTY D.P.W.
ABINGDON, MD · 104,567 served
CITY OF HAGERSTOWN
HAGERSTOWN, MD · 92,200 served
WALDORF - CHARLES COUNTY DPW
LA PLATA, MD · 84,296 served
NEW DESIGN - FREDERICK COUNTY
FREDERICK, MD · 74,911 served
CROFTON-ODENTON
MILLERSVILLE, MD · 62,986 served
FORT GEORGE G. MEADE
FORT MEADE, MD · 62,234 served
CITY OF FREDERICK
FREDERICK, MD · 54,000 served
CITY OF ROCKVILLE
MD · 52,000 served
LEXINGTON PARK
CALIFORNIA, MD · 43,030 served
CITY OF WESTMINSTER
WESTMINSTER, MD · 35,256 served
CITY OF ANNAPOLIS
ANNAPOLIS, MD · 35,000 served
CITY OF SALISBURY
SALISBURY, MD · 30,343 served
TOWN OF OCEAN CITY
OCEAN CITY, MD · 30,000 served
CITY OF CUMBERLAND
CUMBERLAND, MD · 27,039 served
CITY OF BOWIE
BOWIE, MD · 25,000 served
FREEDOM DISTRICT
WESTMINSTER, MD · 24,867 served
Most Violations
#1 RECKLEY SPRING COMMUNITY WATER EAST GREENVILLE
555 #2 EWELL WATERWORKS COOPERATIVE TYLERTON
495 #3 GOLDEN KAY APARTMENTS ELKTON
490 #4 TYLERTON WATERWORK COOPERATIVE TYLERTON
460 #5 HILL WATERWORKS COOPERATIVE TYLERTON
459 #6 MIDTOWN WATERWORKS COOPERATIVE TYLERTON
455 #7 RHODES POINT SOUTH WATERWORKS TYLERTON
444 #8 CEDAR MOBILE HOME PARK COLUMBIA
348 #9 BB APARTMENTS (PREV WOC VILLAGE APTS) OCEAN CITY
308 #10 TOWN OF PRINCESS ANNE PRINCESS ANNE
305 #11 BARRELVILLE MT. SAVAGE
301 #12 THUNDERBIRD MOTEL NEWBURG
301 #13 SWANN HAVEN MOBILE HOME PARK CHESTER
280 #14 RELIANCE MOBILE HOME PARK
265 #15 AMELANO MANOR FREDERICK
265 Counties in Maryland
Montgomery
56 systems · 1,971,831 served
· 1,796 violations
Baltimore city
13 systems · 1,608,056 served
· 122 violations
Anne Arundel
425 systems · 567,204 served
· 5,956 violations
Howard
88 systems · 309,588 served
· 985 violations
Harford
238 systems · 217,578 served
· 3,670 violations
Frederick
220 systems · 215,362 served
· 3,555 violations
Charles
171 systems · 143,656 served
· 3,860 violations
Carroll
224 systems · 132,585 served
· 3,560 violations
Washington
89 systems · 127,174 served
· 1,539 violations
St. Mary's
200 systems · 125,614 served
· 2,495 violations
Worcester
139 systems · 95,000 served
· 2,846 violations
Calvert
226 systems · 83,754 served
· 3,228 violations
Cecil
197 systems · 70,068 served
· 6,007 violations
Allegany
59 systems · 68,967 served
· 1,901 violations
Wicomico
98 systems · 58,618 served
· 2,635 violations
Prince George's
38 systems · 56,734 served
· 1,362 violations
Baltimore
276 systems · 46,635 served
· 3,504 violations
Queen Anne's
100 systems · 31,903 served
· 1,478 violations
Talbot
41 systems · 30,121 served
· 1,179 violations
Dorchester
75 systems · 25,599 served
· 1,468 violations
Garrett
80 systems · 25,122 served
· 943 violations
Kent
58 systems · 20,499 served
· 1,297 violations
Caroline
64 systems · 19,836 served
· 2,080 violations
Somerset
37 systems · 18,632 served
· 3,029 violations