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WaterSafeCheck
Official EPA SDWIS Statewide AnalysisState Water Quality & Testing Directory

Delaware Drinking Water Quality & Testing Directory

Comprehensive EPA compliance records, water testing guidelines, and city rankings covering all 97 ZIP codes across Delaware

Quick Summary: Is Tap Water Safe in Delaware?

Drinking water in Delaware receives an average composite safety score of 80.6/100 based on EPA Safe Drinking Water Act records. Approximately 31% of monitored ZIP codes earn an "A" grade. Water sources are 47.4% surface water and 52.6% groundwater, resulting in Hard to Very Hard mineral hardness across the state.

Total ZIP Codes

97

Health Violations (5yr)

14

Statewide Avg Score

80.6/100

High Lead Risk Areas

24.7%

Overview: Drinking Water in Delaware

Drinking water quality in Delaware averages a composite safety score of 80.6/100 across its 97 monitored ZIP codes. Approximately 31% of ZIP codes in the state receive an "A" grade, while 0% receive an "F" grade. Environmental standards are enforced by Delaware Division of Public Health.

Surface Water

47.4%

of ZIP codes

Total Violations

155

5-year record

Grade A ZIPs

30

31% of state

Grade F ZIPs

0

0% of state

Water Quality Grade Distribution in Delaware

How do Delaware's 97 ZIP codes stack up by water quality grade?

A
30 ZIP codes31%
B
56 ZIP codes58%
C
9 ZIP codes9%
D
2 ZIP codes2%
F
0 ZIP codes0%

Popular Cities in Delaware

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

Wilmington

26 ZIPs

B

Newark

11 ZIPs

B

Dover

5 ZIPs

A

New Castle

2 ZIPs

B

Bear

1 ZIP

B

Claymont

1 ZIP

C

Delaware City

1 ZIP

B

Hockessin

1 ZIP

B

Kirkwood

1 ZIP

D

Middletown

1 ZIP

B

Montchanin

1 ZIP

B

Odessa

1 ZIP

B

Port Penn

1 ZIP

B

Rockland

1 ZIP

C

Saint Georges

1 ZIP

D

Townsend

1 ZIP

B

Winterthur

1 ZIP

C

Yorklyn

1 ZIP

C

Dover Afb

1 ZIP

A

Bethany Beach

1 ZIP

B

Bethel

1 ZIP

B

Bridgeville

1 ZIP

A

Camden Wyoming

1 ZIP

B

Cheswold

1 ZIP

A

Clayton

1 ZIP

A

Dagsboro

1 ZIP

B

Delmar

1 ZIP

A

Ellendale

1 ZIP

A

Felton

1 ZIP

A

Fenwick Island

1 ZIP

B

Frankford

1 ZIP

A

Frederica

1 ZIP

A

Georgetown

1 ZIP

A

Greenwood

1 ZIP

A

Harbeson

1 ZIP

A

Harrington

1 ZIP

A

Hartly

1 ZIP

A

Houston

1 ZIP

C

Kenton

1 ZIP

A

Laurel

1 ZIP

A

City A-Z Directory — Delaware

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

B
BearBethany BeachBethelBridgeville
C
Camden WyomingCheswoldClaymontClayton
D
DagsboroDelaware CityDelmarDoverDover Afb
E
Ellendale
F
FeltonFenwick IslandFrankfordFrederica
G
GeorgetownGreenwood
H
HarbesonHarringtonHartlyHockessinHouston
K
KentonKirkwood
L
LaurelLewesLincolnLittle Creek
M
MagnoliaMarydelMiddletownMilfordMillsboroMillvilleMiltonMontchanin
N
NassauNew CastleNewark
O
Ocean ViewOdessa
P
Port Penn
R
Rehoboth BchRockland
S
Saint GeorgesSeafordSelbyvilleSmyrna
T
Townsend
V
Viola
W
WilmingtonWinterthurWoodside
Y
Yorklyn

🏆 Highest Rated ZIP Codes in Delaware

19902Dover Afb
99/100
A
19955Kenton
98/100
A
19979Viola
97/100
A
19933Bridgeville
95/100
A
19940Delmar
95/100
A

⚠ Lowest Rated ZIP Codes in Delaware

19708Kirkwood
53/100
D
19733Saint Georges
53/100
D
19703Claymont
55/100
C
19732Rockland
55/100
C
19736Yorklyn
55/100
C

Common Drinking Water Contaminants in Delaware

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

Consumer Confidence Report RuleContaminant 1032Lead

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 — Delaware Drinking Water

Is tap water generally safe to drink in Delaware?+
Yes, for the majority of residents, tap water in Delaware is treated and regulated. However, compliance varies by city. State-wide, 30 ZIP codes receive an "A" grade, while 0 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 Delaware?+
Residents in Delaware can test their tap or well water by contacting laboratories certified by Delaware Division 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 Delaware?+
The primary issues include managing 14 health-based violations state-wide and resolving infrastructure age. 24.7% 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 Delaware?+
Drinking water in Delaware is regulated by Delaware Division of Public Health under a primacy agreement with the U.S. EPA.
Where does Delaware get its drinking water?+
Approximately 47.4% of monitored areas in Delaware 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 Delaware?+
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 97 ZIP Codes in Delaware

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

19701197021970319706197071970819709197101971119712197131971419715197161971719718197201972119725197261973019731197321973319734197351973619801198021980319804198051980619807198081980919810198501988019884198851988619887198901989119892198931989419895198961989719898198991990119902199031990419905199061993019931199331993419936199381993919940199411994319944199451994619947199501995119952199531995419955199561995819960199611996219963199641996619967199681996919970199711997319975199771997919980

All 97 ZIP codes in Delaware are actively monitored under the EPA Safe Drinking Water Act.