State rankings

Maryland water-system rankings

Community water systems in Maryland ranked by PurityRadar safety score — from EPA violations, enforcement, and PFAS data.

Lowest-scoring systems in Maryland

Ranked lowest score first. Population shown for context.

1 TOWN OF THURMONT THURMONT, MD · ~6,200 served 34 2 CITY OF ABERDEEN ABERDEEN, MD · ~18,006 served 37 3 TOWN OF ELKTON ELKTON, MD · ~15,625 served 40 4 CITY OF WESTMINSTER WESTMINSTER, MD · ~35,256 served 44 5 CITY OF SALISBURY SALISBURY, MD · ~30,343 served 45 6 TOWN OF HAMPSTEAD HAMPSTEAD, MD · ~6,600 served 49 7 CITY OF TANEYTOWN TANEYTOWN, MD · ~6,750 served 58 8 TOWN OF POOLESVILLE POOLESVILLE, MD · ~6,005 served 60 9 MARYLAND AMERICAN WATER COMPANY BEL AIR, MD · ~13,200 served 63 10 TOWN OF MOUNT AIRY MOUNT AIRY, MD · ~9,890 served 69 11 TOWN OF MIDDLETOWN MIDDLETOWN, MD · ~4,288 served 70 12 BOONSBORO - KEEDYSVILLE BOONSBORO, MD · ~4,250 served 75 13 CITY OF FRUITLAND FRUITLAND, MD · ~5,907 served 91 14 TOWN OF MANCHESTER MANCHESTER, MD · ~4,954 served 91 15 WASHINGTON SUBURBAN SANITARY COMMISSION LAUREL, MD · ~1,900,000 served 100 16 CITY OF BALTIMORE BALTIMORE, MD · ~1,600,000 served 100 17 GLEN BURNIE-BROADNECK MILLERSVILLE, MD · ~290,606 served 100 18 HOWARD COUNTY D.P.W. DISTRIBUTION COLUMBIA, MD · ~286,158 served 100 19 HARFORD COUNTY D.P.W. ABINGDON, MD · ~104,567 served 100 20 CITY OF HAGERSTOWN HAGERSTOWN, MD · ~92,200 served 100 21 WALDORF - CHARLES COUNTY DPW LA PLATA, MD · ~84,296 served 100 22 NEW DESIGN - FREDERICK COUNTY FREDERICK, MD · ~74,911 served 100 23 CROFTON-ODENTON MILLERSVILLE, MD · ~62,986 served 100 24 FORT GEORGE G. MEADE FORT MEADE, MD · ~62,234 served 100 25 CITY OF FREDERICK FREDERICK, MD · ~54,000 served 100

Highest-scoring large systems in Maryland

Systems serving 10,000+ people with the best scores.

1 WASHINGTON SUBURBAN SANITARY COMMISSION LAUREL, MD · ~1,900,000 served 100 2 CITY OF BALTIMORE BALTIMORE, MD · ~1,600,000 served 100 3 GLEN BURNIE-BROADNECK MILLERSVILLE, MD · ~290,606 served 100 4 HOWARD COUNTY D.P.W. DISTRIBUTION COLUMBIA, MD · ~286,158 served 100 5 HARFORD COUNTY D.P.W. ABINGDON, MD · ~104,567 served 100 6 CITY OF HAGERSTOWN HAGERSTOWN, MD · ~92,200 served 100 7 WALDORF - CHARLES COUNTY DPW LA PLATA, MD · ~84,296 served 100 8 NEW DESIGN - FREDERICK COUNTY FREDERICK, MD · ~74,911 served 100

Maryland directory → All states

Scores reflect EPA public records (violations, enforcement, PFAS), are system-level, and can’t account for your home’s plumbing. See the methodology.