Maryland County Water Quality Reports

Allegany County, MD: 7 Health Violations — 66/100 (2026)

2026 report: Allegany County, MD scores 66/100 (Grade C). 24 ZIP codes analyzed. 15 EPA violations found. Free report with contaminant data and filter p...

Anne Arundel County, MD: 7 Health Violations — 60/100 (2026)

2026 report: Anne Arundel County, MD scores 60/100 (Grade C). 80 ZIP codes analyzed. 35 EPA violations found. Free report with contaminant data and filt...

Baltimore County, MD: 99 Health Violations — 58/100 (2026)

2026 report: Baltimore County, MD scores 58/100 (Grade C). 73 ZIP codes analyzed. 534 EPA violations found. Free report with contaminant data and filter...

Calvert County, MD: 5 Health Violations — 47/100 (2026)

2026 report: Calvert County, MD scores 47/100 (Grade D). 26 ZIP codes analyzed. 21 EPA violations found. Free report with contaminant data and filter pi...

Caroline County, MD: 5 Health Violations — 82/100 (2026)

2026 report: Caroline County, MD scores 82/100 (Grade B). 14 ZIP codes analyzed. 59 EPA violations found. Free report with contaminant data and filter p...

Carroll County, MD: 7 Health Violations — 52/100 (2026)

2026 report: Carroll County, MD scores 52/100 (Grade D). 34 ZIP codes analyzed. 18 EPA violations found. Free report with contaminant data and filter pi...

Cecil County, MD: Lead Above EPA Limits — 63/100 (2026)

2026 report: Cecil County, MD scores 63/100 (Grade C). 26 ZIP codes analyzed. 70 EPA violations found. Lead above EPA limits. Free report with contamina...

Charles County, MD: 3 Health Violations — 66/100 (2026)

2026 report: Charles County, MD scores 66/100 (Grade C). 19 ZIP codes analyzed. 47 EPA violations found. Free report with contaminant data and filter pi...

Dorchester County, MD: 2 Health Violations — 74/100 (2026)

2026 report: Dorchester County, MD scores 74/100 (Grade B). 13 ZIP codes analyzed. 5 EPA violations found. Free report with contaminant data and filter ...

Frederick County, MD: 8 Health Violations — 53/100 (2026)

2026 report: Frederick County, MD scores 53/100 (Grade D). 35 ZIP codes analyzed. 42 EPA violations found. Free report with contaminant data and filter ...

Garrett County, MD: 1 Health Violation — 69/100 (2026)

2026 report: Garrett County, MD scores 69/100 (Grade C). 8 ZIP codes analyzed. 4 EPA violations found. Free report with contaminant data and filter picks.

Harford County, MD: 4 Health Violations — 49/100 (2026)

2026 report: Harford County, MD scores 49/100 (Grade D). 15 ZIP codes analyzed. 19 EPA violations found. Free report with contaminant data and filter pi...

Howard County, MD: 6 Health Violations — 62/100 (2026)

2026 report: Howard County, MD scores 62/100 (Grade C). 9 ZIP codes analyzed. 50 EPA violations found. Free report with contaminant data and filter picks.

Kent County, MD: 2 Health Violations — 77/100 (2026)

2026 report: Kent County, MD scores 77/100 (Grade B). 9 ZIP codes analyzed. 4 EPA violations found. Free report with contaminant data and filter picks.

Montgomery County, MD: Lead Above EPA Limits — 52/100 (2026)

2026 report: Montgomery County, MD scores 52/100 (Grade D). 65 ZIP codes analyzed. 9 EPA violations found. Lead above EPA limits. Free report with conta...

Prince George's County, MD: 7 Health Violations — 62/100

2026 report: Prince George's County, MD scores 62/100 (Grade C). 46 ZIP codes analyzed. 14 EPA violations found. Free report with contaminant data and f...

Queen Anne's County, MD: 7 Health Violations — 80/100

2026 report: Queen Anne's County, MD scores 80/100 (Grade B). 15 ZIP codes analyzed. 37 EPA violations found. Free report with contaminant data and filt...

Somerset County, MD: 3 Health Violations — 57/100 (2026)

2026 report: Somerset County, MD scores 57/100 (Grade C). 14 ZIP codes analyzed. 18 EPA violations found. Free report with contaminant data and filter p...

St. Mary's County, MD: 4 Health Violations — 60/100

2026 report: St. Mary's County, MD scores 60/100 (Grade C). 26 ZIP codes analyzed. 19 EPA violations found. Free report with contaminant data and filter...

Talbot County, MD: Lead Above EPA Limits — 76/100 (2026)

2026 report: Talbot County, MD scores 76/100 (Grade B). 12 ZIP codes analyzed. 28 EPA violations found. Lead above EPA limits. Free report with contamin...

Washington County, MD: Lead Above EPA Limits — 57/100 (2026)

2026 report: Washington County, MD scores 57/100 (Grade C). 20 ZIP codes analyzed. 23 EPA violations found. Lead above EPA limits. Free report with cont...

Wicomico County, MD: Lead Above EPA Limits — 77/100 (2026)

2026 report: Wicomico County, MD scores 77/100 (Grade B). 20 ZIP codes analyzed. 27 EPA violations found. Lead above EPA limits. Free report with contam...

Worcester County, MD: 9 Health Violations — 78/100 (2026)

2026 report: Worcester County, MD scores 78/100 (Grade B). 12 ZIP codes analyzed. 37 EPA violations found. Free report with contaminant data and filter ...