Maryland Tap Water Quality

Explore tap water quality data for counties across Maryland. View water system reports, track violations, monitor drinking water safety, and check fluoridation status in your community.

Counties

25

With water systems

Population

5,491,506

Served by water systems

Water Systems

463

Total water systems

Violators

3

Systems with serious violations

Searching by your address yields the most accurate results. Searching by town or water system may not show all systems due to how the EPA categorizes data. Some towns may be listed under counties, and water system boundaries don't always align with town boundaries.

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Maryland Counties

Serious Violator

Allegany

Population: 65,734

Water Systems: 17

Anne Arundel

Population: 505,165

Water Systems: 27

Baltimore

Population: 2,724

Water Systems: 8

Baltimore City

Population: 1,601,151

Water Systems: 4

Calvert

Population: 35,025

Water Systems: 30

Serious Violator

Caroline

Population: 12,871

Water Systems: 19

Carroll

Population: 97,151

Water Systems: 24

Cecil

Population: 53,286

Water Systems: 48

Charles

Population: 119,104

Water Systems: 50

Dorchester

Population: 20,208

Water Systems: 12

Frederick

Population: 154,703

Water Systems: 32

Garrett

Population: 13,781

Water Systems: 16

Harford

Population: 168,713

Water Systems: 17

Howard

Population: 286,643

Water Systems: 3

Kent

Population: 11,390

Water Systems: 11

Montgomery

Population: 1,958,904

Water Systems: 5

Prince Georges

Population: 26,410

Water Systems: 4

Queen Annes

Population: 16,709

Water Systems: 14

Saint Marys

Population: 89,092

Water Systems: 38

Somerset

Population: 11,185

Water Systems: 10

Stevensville

Population: 1,630

Water Systems: 2

Serious Violator

Talbot

Population: 22,760

Water Systems: 8

Washington

Population: 111,038

Water Systems: 20

Serious Violator

Wicomico

Population: 47,236

Water Systems: 25

Worcester

Population: 58,893

Water Systems: 19