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WaterSafeCheck
Official EPA SDWIS Statewide AnalysisState Water Quality & Testing Directory

Connecticut Drinking Water Quality & Testing Directory

Comprehensive EPA compliance records, water testing guidelines, and city rankings covering all 433 ZIP codes across Connecticut

Quick Summary: Is Tap Water Safe in Connecticut?

Drinking water in Connecticut receives an average composite safety score of 64.9/100 based on EPA Safe Drinking Water Act records. Approximately 13% of monitored ZIP codes earn an "A" grade. Water sources are 61.7% surface water and 38.3% groundwater, resulting in Moderately Soft to Moderate mineral hardness across the state.

Total ZIP Codes

433

Health Violations (5yr)

343

Statewide Avg Score

64.9/100

High Lead Risk Areas

56.6%

Overview: Drinking Water in Connecticut

Drinking water quality in Connecticut averages a composite safety score of 64.9/100 across its 433 monitored ZIP codes. Approximately 13% of ZIP codes in the state receive an "A" grade, while 2% receive an "F" grade. Environmental standards are enforced by Connecticut Department of Public Health.

Surface Water

61.7%

of ZIP codes

Total Violations

3,061

5-year record

Grade A ZIPs

57

13% of state

Grade F ZIPs

9

2% of state

Water Quality Grade Distribution in Connecticut

How do Connecticut's 433 ZIP codes stack up by water quality grade?

A
57 ZIP codes13%
B
73 ZIP codes17%
C
187 ZIP codes43%
D
107 ZIP codes25%
F
9 ZIP codes2%

Popular Cities in Connecticut

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

Hartford

36 ZIPs

A

New Haven

26 ZIPs

C

Stamford

19 ZIPs

C

Waterbury

16 ZIPs

C

Norwalk

11 ZIPs

C

Bridgeport

10 ZIPs

D

West Hartford

7 ZIPs

C

Danbury

6 ZIPs

C

Manchester

4 ZIPs

A

New Britain

4 ZIPs

A

East Hartford

4 ZIPs

C

Wallingford

4 ZIPs

C

Westport

4 ZIPs

D

Farmington

3 ZIPs

A

Cheshire

3 ZIPs

D

Meriden

3 ZIPs

C

Hamden

3 ZIPs

D

Fairfield

3 ZIPs

D

Greenwich

3 ZIPs

C

Windsor

2 ZIPs

C

Bristol

2 ZIPs

B

Wethersfield

2 ZIPs

A

Newington

2 ZIPs

A

Suffield

2 ZIPs

A

Enfield

2 ZIPs

A

Unionville

2 ZIPs

C

Storrs Mansfield

2 ZIPs

C

Groton

2 ZIPs

D

Middletown

2 ZIPs

C

Milford

2 ZIPs

D

Stratford

2 ZIPs

F

Torrington

2 ZIPs

B

Ridgefield

2 ZIPs

C

Avon

1 ZIP

B

Bloomfield

1 ZIP

C

Burlington

1 ZIP

A

Broad Brook

1 ZIP

A

Canaan

1 ZIP

B

Canton

1 ZIP

A

Canton Center

1 ZIP

B

City A-Z Directory — Connecticut

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

A
AbingtonAmstonAndoverAnsoniaAshfordAvon
B
BallouvilleBalticBantamBarkhamstedBeacon FallsBerlinBethanyBethelBethlehemBloomfieldBoltonBotsfordBozrahBranfordBridgeportBridgewaterBristolBroad BrookBrookfieldBrooklynBurlington
C
CanaanCanterburyCantonCanton CenterCenterbrookCentral VillageChaplinCheshireChesterClintonCobaltColchesterColebrookCollinsvilleColumbiaCornwallCornwall BridgeCos CobCoventryCromwell
D
DanburyDanielsonDarienDayvilleDeep RiverDerbyDurham
E
East BerlinEast CanaanEast GlastonburyEast GranbyEast HaddamEast HamptonEast HartfordEast HartlandEast HavenEast KillinglyEast LymeEast WindsorEast Windsor HillEast WoodstockEastfordEastonEllingtonEnfieldEssex
F
FabyanFairfieldFalls VillageFarmington
G
Gales FerryGaylordsvilleGeorgetownGilmanGlastonburyGoshenGranbyGreens FarmsGreenwichGrosvenor DaleGrotonGuilford
H
HaddamHadlymeHamdenHamptonHanoverHartfordHarwintonHawleyvilleHebronHigganum
I
Ivoryton
J
Jewett City
K
KentKillingworth
L
LakesideLakevilleLebanonLedyardLitchfield
M
MadisonManchesterMansfield CenterMansfield DepotMarionMarlboroughMashantucketMeridenMiddle HaddamMiddleburyMiddlefieldMiddletownMilfordMilldaleMonroeMontvilleMoodusMoosupMorrisMystic
N
NaugatuckNew BritainNew CanaanNew FairfieldNew HartfordNew HavenNew LondonNew MilfordNew Preston Marble DaleNewingtonNewtownNianticNorfolkNorth BranfordNorth CantonNorth FranklinNorth GranbyNorth GrosvenordaleNorth HavenNorth StoningtonNorth WestchesterNorth WindhamNorthfieldNorthfordNorwalkNorwich
O
OakdaleOakvilleOld GreenwichOld LymeOld MysticOld SaybrookOnecoOrangeOxford
P
PawcatuckPequabuckPine MeadowPlainfieldPlainvillePlantsvillePlymouthPomfretPomfret CenterPoquonockPortlandPrestonProspectPutnam
Q
Quaker HillQuinebaug
R
ReddingRedding CenterRedding RidgeRidgefieldRiversideRivertonRockfallRocky HillRogersRoxbury
S
SalemSalisburySandy HookScotlandSeymourSharonSheltonShermanSimsburySomersSomersvilleSouth BritainSouth GlastonburySouth KentSouth LymeSouth WillingtonSouth WindhamSouth WindsorSouth WoodstockSouthburySouthingtonSouthportStaffordStafford SpringsStaffordvilleStamfordSterlingStevensonStoningtonStorrs MansfieldStratfordSuffield
T
TaconicTaftvilleTariffvilleTerryvilleThomastonThompsonTollandTorringtonTrumbull
U
UncasvilleUnionville
V
Vernon RockvilleVersaillesVoluntown
W
WallingfordWashingtonWashington DepotWaterburyWaterfordWatertownWaureganWeatogueWest CornwallWest GranbyWest HartfordWest HartlandWest HavenWest MysticWest SimsburyWest SuffieldWestbrookWestonWestportWethersfieldWillimanticWillingtonWiltonWinchester CenterWindhamWindsorWindsor LocksWinstedWolcottWoodbridgeWoodburyWoodstockWoodstock Valley
Y
Yantic

🏆 Highest Rated ZIP Codes in Connecticut

06050New Britain
99/100
A
06080Suffield
99/100
A
06081Tariffville
98/100
A
06129Wethersfield
98/100
A
06131Newington
97/100
A

⚠ Lowest Rated ZIP Codes in Connecticut

06512East Haven
30/100
F
06475Old Saybrook
35/100
F
06518Hamden
35/100
F
06604Bridgeport
35/100
F
06605Bridgeport
35/100
F

Common Drinking Water Contaminants in Connecticut

The following are common regulated contaminants found in Connecticut 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 RuleContaminant 0700BariumFecal ColiformStage 1 DBP RuleHaloacetic Acids (HAA5)Combined Radium

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 — Connecticut Drinking Water

Is tap water generally safe to drink in Connecticut?+
Yes, for the majority of residents, tap water in Connecticut is treated and regulated. However, compliance varies by city. State-wide, 57 ZIP codes receive an "A" grade, while 9 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 Connecticut?+
Residents in Connecticut can test their tap or well water by contacting laboratories certified by Connecticut Department of Public Health 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 Connecticut?+
The primary issues include managing 343 health-based violations state-wide and resolving infrastructure age. 56.6% 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 Connecticut?+
Drinking water in Connecticut is regulated by Connecticut Department of Public Health under a primacy agreement with the U.S. EPA.
Where does Connecticut get its drinking water?+
Approximately 61.7% of monitored areas in Connecticut 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 Connecticut?+
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 433 ZIP Codes in Connecticut

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

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All 433 ZIP codes in Connecticut are actively monitored under the EPA Safe Drinking Water Act.