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.
State average grade
C
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.
Grade distribution
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 | GLEN BURNIE-BROADNECK | MILLERSVILLE | 290,606 | 94 | A |
| #2 | CROFTON-ODENTON | MILLERSVILLE | 62,986 | 92 | A |
| #3 | FORT GEORGE G. MEADE | FORT MEADE | 62,234 | 88 | A |
| #4 | HOWARD COUNTY D.P.W. DISTRIBUTION | COLUMBIA | 286,158 | 86 | A |
| #5 | CITY OF HAGERSTOWN | HAGERSTOWN | 92,200 | 82 | B |
| #6 | CITY OF FREDERICK | FREDERICK | 54,000 | 78 | B |
| #7 | HARFORD COUNTY D.P.W. | ABINGDON | 104,567 | 74 | C |
| #8 | WASHINGTON SUBURBAN SANITARY COMMISSION | LAUREL | 1,900,000 | 73 | C |
| #9 | WALDORF - CHARLES COUNTY DPW | LA PLATA | 84,296 | 72 | C |
| #10 | NEW DESIGN - FREDERICK COUNTY | FREDERICK | 74,911 | 70 | C |
| #11 | CITY OF BALTIMORE | BALTIMORE | 1,600,000 | 67 | C |
| #12 | Baltimore Water Utilities | Baltimore | 593,000 | 64 | D |