Maryland Water Quality Ratings

TapWaterSafety has rated 12 public water systems in Maryland, serving a combined 5,204,958 residents. The statewide average grade is C.

Data sources: EPA SDWIS EPA ECHO EWG Tap Water Database Utility CCRs ⓘ How did we get these ratings?
State average grade
C
70/100
Total utilities rated 12
Population served 5,204,958
Most recent test 2024
🇪🇺 Would fail EU standards 1 of 12

Top water quality concerns in Maryland

  • Haloacetic acids (HAA9) significantly above health guideline
  • Total trihalomethanes (TTHMs) significantly above health guideline
  • Haloacetic acids (HAA5) significantly above health guideline
  • Radium, combined (-226 and -228) significantly above health guideline
  • Arsenic detected

Cities in Maryland

Browse tap water quality reports by city. Click any city to see its grade, what's in the water, and recommended filters.

ABINGDON
D 104,567
BALTIMORE
D 1,600,000
Baltimore
F 593,000
COLUMBIA
C 286,158
FORT MEADE
C 62,234
FREDERICK
D 128,911
HAGERSTOWN
D 92,200
LA PLATA
D 84,296
LAUREL
D 1,900,000
MILLERSVILLE
A 353,592

Grade distribution

A
2 (17%)
B
2 (17%)
C
4 (33%)
D
3 (25%)
F
1 (8%)

All rated utilities in Maryland

Sorted by score, highest first. Click any utility to see the full grade card.

Rank Utility City Population Score Grade
#1 CROFTON-ODENTON MILLERSVILLE 62,986 90 A
#2 GLEN BURNIE-BROADNECK MILLERSVILLE 290,606 89 A
#3 FORT GEORGE G. MEADE FORT MEADE 62,234 79 B
#4 HOWARD COUNTY D.P.W. DISTRIBUTION COLUMBIA 286,158 78 B
#5 CITY OF HAGERSTOWN HAGERSTOWN 92,200 68 C
#6 WALDORF - CHARLES COUNTY DPW LA PLATA 84,296 67 C
#7 HARFORD COUNTY D.P.W. ABINGDON 104,567 67 C
#8 NEW DESIGN - FREDERICK COUNTY FREDERICK 74,911 65 C
#9 CITY OF FREDERICK FREDERICK 54,000 63 D
#10 WASHINGTON SUBURBAN SANITARY COMMISSION LAUREL 1,900,000 63 D
#11 CITY OF BALTIMORE BALTIMORE 1,600,000 63 D
#12 Baltimore Water Utilities Baltimore 593,000 50 F