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WaterSafeCheck
Official EPA SDWIS Statewide AnalysisState Water Quality & Testing Directory

Maryland Drinking Water Quality & Testing Directory

Comprehensive EPA compliance records, water testing guidelines, and city rankings covering all 615 ZIP codes across Maryland

Quick Summary: Is Tap Water Safe in Maryland?

Drinking water in Maryland receives an average composite safety score of 60.7/100 based on EPA Safe Drinking Water Act records. Approximately 6% of monitored ZIP codes earn an "A" grade. Water sources are 50.9% surface water and 49.1% groundwater, resulting in Hard to Very Hard mineral hardness across the state.

Total ZIP Codes

615

Health Violations (5yr)

229

Statewide Avg Score

60.7/100

High Lead Risk Areas

47.6%

Overview: Drinking Water in Maryland

Drinking water quality in Maryland averages a composite safety score of 60.7/100 across its 615 monitored ZIP codes. Approximately 6% of ZIP codes in the state receive an "A" grade, while 1% receive an "F" grade. Environmental standards are enforced by Maryland Department of the Environment.

Surface Water

50.9%

of ZIP codes

Total Violations

1,135

5-year record

Grade A ZIPs

36

6% of state

Grade F ZIPs

4

1% of state

Water Quality Grade Distribution in Maryland

How do Maryland's 615 ZIP codes stack up by water quality grade?

A
36 ZIP codes6%
B
93 ZIP codes15%
C
271 ZIP codes44%
D
211 ZIP codes34%
F
4 ZIP codes1%

Popular Cities in Maryland

Click any city to view ZIP code-level water quality reports

Baltimore

50 ZIPs

C

Silver Spring

16 ZIPs

C

Bethesda

11 ZIPs

C

Gaithersburg

9 ZIPs

D

Rockville

8 ZIPs

D

Annapolis

8 ZIPs

B

Laurel

7 ZIPs

B

Bowie

7 ZIPs

B

Hyattsville

7 ZIPs

D

Hagerstown

7 ZIPs

C

Frederick

6 ZIPs

C

Capitol Heights

5 ZIPs

C

Upper Marlboro

5 ZIPs

D

Cumberland

5 ZIPs

B

Waldorf

4 ZIPs

B

Ridgely

4 ZIPs

A

Salisbury

4 ZIPs

C

College Park

3 ZIPs

D

Greenbelt

3 ZIPs

D

Germantown

3 ZIPs

D

Ellicott City

3 ZIPs

C

Columbia

3 ZIPs

C

Glen Burnie

3 ZIPs

D

Towson

3 ZIPs

C

Southern Md Facility

2 ZIPs

D

Lanham

2 ZIPs

D

Beltsville

2 ZIPs

D

Riverdale

2 ZIPs

D

Fort Washington

2 ZIPs

D

Oxon Hill

2 ZIPs

D

Suitland

2 ZIPs

D

District Heights

2 ZIPs

D

Temple Hills

2 ZIPs

D

Chevy Chase

2 ZIPs

D

Olney

2 ZIPs

D

Potomac

2 ZIPs

F

Takoma Park

2 ZIPs

D

Bel Air

2 ZIPs

C

Kensington

2 ZIPs

D

Hunt Valley

2 ZIPs

D

City A-Z Directory — Maryland

Browse water quality reports for every town and city in Maryland.

A
AbellAberdeenAberdeen Proving GroundAbingdonAccidentAccokeekAdamstownAllenAndrews Air Force BaseAnnapolisAnnapolis JunctionAquascoArnoldAshtonAvenue
B
BaldwinBaltimoreBarclayBarnesvilleBarstowBartonBeallsvilleBel AirBel AltonBelcampBeltsvilleBenedictBensonBerlinBethesdaBethlehemBettertonBig PoolBishopvilleBittingerBivalveBladensburgBloomingtonBoonsboroBoringBowieBoydsBozmanBraddock HeightsBrandywineBrentwoodBrinklowBrookevilleBrooklandvilleBrooklynBroomes IslandBrownsvilleBrunswickBryans RoadBryantownBuckeystownBurkittsvilleBurtonsvilleBushwoodButler
C
Cabin JohnCaliforniaCallawayCambridgeCapitol HeightsCascadeCatonsvilleCavetownCeciltonCentrevilleChapticoCharlestownCharlotte HallChaseCheltenhamChesapeake BeachChesapeake CityChesterChestertownChevy ChaseChewsvilleChildsChurch CreekChurch HillChurchtonChurchvilleClaiborneClarksburgClarksvilleClear SpringClementsClintonCobb IslandCockeysvilleCollege ParkColoraColtons PointColumbiaComptonConowingoCooksvilleCordovaCorriganvilleCrapoCrisfieldCrocheronCroftonCrownsvilleCrumptonCumberlandCurtis Bay
D
DamascusDameronDarlingtonDavidsonvilleDaytonDeal IslandDealeDelmarDentonDerwoodDhsDickersonDistrict HeightsDowellDraydenDundalkDunkirk
E
EarlevilleEast New MarketEastonEckhart MinesEdenEdgewaterEdgewoodElk MillsElkridgeElktonEllerslieEllicott CityEmmitsburgEssexEwell
F
FairplayFallstonFaulknerFederalsburgFinksburgFishing CreekFlintstoneForest HillForkFort George G MeadeFort HowardFort WashingtonFrederickFreelandFriendshipFriendsvilleFrostburgFruitlandFultonFunkstown
G
GaithersburgGalenaGalesvilleGambrillsGarrett ParkGeorgetownGermantownGibson IslandGirdletreeGlen ArmGlen BurnieGlen EchoGlenelgGlenn DaleGlenwoodGlyndonGoldsboroGrantsvilleGrasonvilleGreat MillsGreenbeltGreensboroGunpowderGwynn Oak
H
HagerstownHalethorpeHampsteadHancockHanoverHarmansHarwoodHavre De GraceHebronHelenHendersonHighlandHillsboroHollywoodHughesvilleHunt ValleyHuntingtownHurlockHyattsvilleHydes
I
IjamsvilleIndian HeadInglesideIronsidesIssue
J
JarrettsvilleJeffersonJessupJoppa
K
KeedysvilleKennedyvilleKensingtonKeymarKingsvilleKitzmillerKnoxville
L
La PlataLadiesburgLanhamLaurelLeonardtownLexington ParkLibertytownLineboroLinkwoodLinthicum HeightsLisbonLittle OrleansLonaconingLong GreenLothianLovevilleLukeLusbyLutherville Timonium
M
MadisonManchesterManokinMarburyMardela SpringsMarion StationMarriottsvilleMarydelMaryland LineMasseyMaugansvilleMayoMc HenryMcdanielMechanicsvilleMiddle RiverMiddletownMidlandMidlothianMillersvilleMillingtonMonktonMonroviaMontgomery VillageMorganzaMount AiryMount RainierMount SavageMount VictoriaMyersville
N
NanjemoyNanticokeNeavittNew MarketNew MidwayNew WindsorNewarkNewburgNewcombNorth BeachNorth EastNottingham
O
OaklandOcean CityOdentonOldtownOlneyOwingsOwings MillsOxfordOxon Hill
P
Park HallParktonParkvilleParsonsburgPasadenaPatuxent RiverPerry HallPerry PointPerrymanPerryvillePhoenixPikesvillePiney PointPintoPittsvillePocomoke CityPoint Of RocksPomfretPoolesvillePort DepositPort RepublicPort TobaccoPotomacPowellvillePrestonPricePrince FrederickPrincess AnnePylesville
Q
QuanticoQueen AnneQueenstown
R
RandallstownRawlingsRehobethReisterstownRhodesdaleRiderwoodRidgeRidgelyRising SunRivaRiverdaleRock HallRock PointRockvilleRocky RidgeRohrersvilleRosedaleRoyal Oak
S
SabillasvilleSaint InigoesSaint JamesSaint LeonardSaint Marys CitySaint MichaelsSalisburySandy SpringSavageScotlandSecretarySevernSeverna ParkShady SideSharpsburgSharptownSherwoodShowellSilver SpringSimpsonvilleSmithsburgSnow HillSolomonsSouthern Md FacilitySparks GlencoeSparrows PointSpencervilleSpring GapStevensonStevensvilleStill PondStocktonStreetSuburb Maryland FacSudlersvilleSuitlandSunderlandSwantonSykesville
T
Takoma ParkTall TimbersTaneytownTaylors IslandTemple HillsTemplevilleThurmontTilghmanToddvilleTowsonTracys LandingTrappeTuscaroraTyaskinTylerton
U
Union BridgeUnionvilleUpper FairmountUpper FallsUpper MarlboroUpperco
V
Valley LeeVienna
W
WaldorfWalkersvilleWarwickWashington GroveWelcomeWest FriendshipWest RiverWesternportWestminsterWestoverWhaleyvilleWhite HallWhite MarshWhite PlainsWhitefordWillardsWilliamsportWindsor MillWingateWittmanWoodbineWoodsboroWoodstockWoolfordWortonWye Mills

🏆 Highest Rated ZIP Codes in Maryland

21606Easton
99/100
A
21610Betterton
99/100
A
21623Church Hill
98/100
A
21668Sudlersville
98/100
A
21690Chestertown
98/100
A

⚠ Lowest Rated ZIP Codes in Maryland

21719Cascade
32/100
F
20859Potomac
33/100
F
20854Potomac
35/100
F
21122Pasadena
35/100
F
20610Barstow
40/100
D

Common Drinking Water Contaminants in Maryland

The following are common regulated contaminants found in Maryland drinking water based on EPA violation records. Click any contaminant to learn about EPA safety limits and health effects.

Stage 2 DBP RuleConsumer Confidence Report RuleHaloacetic Acids (HAA5)Total Trihalomethanes (TTHM)Stage 1 DBP RuleContaminant 0700ChloriteFecal Coliform

Source: EPA Safe Drinking Water Act Maximum Contaminant Level regulations. For the complete list of regulated contaminants and MCLs, see the Water Quality Safety Guide.

Frequently Asked Questions — Maryland Drinking Water

Is tap water generally safe to drink in Maryland?+
Yes, for the majority of residents, tap water in Maryland is treated and regulated. However, compliance varies by city. State-wide, 36 ZIP codes receive an "A" grade, while 4 receive an "F". Search your specific ZIP code to see your local utility's record.
How do I test water quality or well water in Maryland?+
Residents in Maryland can test their tap or well water by contacting laboratories certified by Maryland Department of the Environment or ordering an EPA-standard laboratory water testing kit. Annual testing is recommended for private wells to test for bacteria, nitrates, and heavy metals.
What are the biggest water quality issues in Maryland?+
The primary issues include managing 229 health-based violations state-wide and resolving infrastructure age. 47.6% of ZIP codes in the state have a high probability of lead exposure risk due to pre-1986 piping.
Who regulates and enforces drinking water standards in Maryland?+
Drinking water in Maryland is regulated by Maryland Department of the Environment under a primacy agreement with the U.S. EPA.
Where does Maryland get its drinking water?+
Approximately 50.9% of monitored areas in Maryland rely on surface water sources (lakes/rivers), while the rest use groundwater aquifers.
How do I find the official water quality report for my home in Maryland?+
Search your ZIP code on our site to view data compiled from EPA records, or contact your local utility for their annual Consumer Confidence Report (CCR).
View All 615 ZIP Codes in Maryland

Browse EPA water quality data for every monitored ZIP code. For faster results, use the search bar above.

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All 615 ZIP codes in Maryland are actively monitored under the EPA Safe Drinking Water Act.