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WaterSafeCheck
Official EPA SDWIS Statewide AnalysisState Water Quality & Testing Directory

Hawaii Drinking Water Quality & Testing Directory

Comprehensive EPA compliance records, water testing guidelines, and city rankings covering all 137 ZIP codes across Hawaii

Quick Summary: Is Tap Water Safe in Hawaii?

Drinking water in Hawaii receives an average composite safety score of 78.7/100 based on EPA Safe Drinking Water Act records. Approximately 47% of monitored ZIP codes earn an "A" grade. Water sources are 8.8% surface water and 91.2% groundwater, resulting in Hard to Very Hard mineral hardness across the state.

Total ZIP Codes

137

Health Violations (5yr)

1

Statewide Avg Score

78.7/100

High Lead Risk Areas

40.9%

Overview: Drinking Water in Hawaii

Drinking water quality in Hawaii averages a composite safety score of 78.7/100 across its 137 monitored ZIP codes. Approximately 47% of ZIP codes in the state receive an "A" grade, while 0% receive an "F" grade. Environmental standards are enforced by Hawaii Department of Health.

Surface Water

8.8%

of ZIP codes

Total Violations

16

5-year record

Grade A ZIPs

65

47% of state

Grade F ZIPs

0

0% of state

Water Quality Grade Distribution in Hawaii

How do Hawaii's 137 ZIP codes stack up by water quality grade?

A
65 ZIP codes47%
B
41 ZIP codes30%
C
31 ZIP codes23%
D
0 ZIP codes0%
F
0 ZIP codes0%

Popular Cities in Hawaii

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

Honolulu

41 ZIPs

A

Kapolei

2 ZIPs

B

Hilo

2 ZIPs

B

Kahului

2 ZIPs

C

Kailua Kona

2 ZIPs

B

Lahaina

2 ZIPs

A

J B P H H

2 ZIPs

C

Aiea

1 ZIP

B

Anahola

1 ZIP

B

Captain Cook

1 ZIP

B

Eleele

1 ZIP

C

Ewa Beach

1 ZIP

C

Haiku

1 ZIP

B

Hakalau

1 ZIP

C

Haleiwa

1 ZIP

C

Hana

1 ZIP

A

Hanalei

1 ZIP

B

Hanamaulu

1 ZIP

C

Hanapepe

1 ZIP

C

Hauula

1 ZIP

C

Hawaii National Park

1 ZIP

A

Hawi

1 ZIP

C

Princeville

1 ZIP

B

Holualoa

1 ZIP

A

Honaunau

1 ZIP

C

Honokaa

1 ZIP

B

Honomu

1 ZIP

A

Hoolehua

1 ZIP

A

Kaaawa

1 ZIP

C

Kahuku

1 ZIP

A

Kailua

1 ZIP

C

Ocean View

1 ZIP

C

Waikoloa

1 ZIP

A

Keauhou

1 ZIP

C

Kalaheo

1 ZIP

A

Kalaupapa

1 ZIP

A

Kamuela

1 ZIP

B

Kaneohe

1 ZIP

B

Kapaa

1 ZIP

C

Kaumakani

1 ZIP

A

City A-Z Directory — Hawaii

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

A
AieaAnahola
C
Camp H M SmithCaptain Cook
E
EleeleEwa Beach
F
Fort Shafter
H
HaikuHakalauHaleiwaHanaHanaleiHanamauluHanapepeHauulaHawaii National ParkHawiHiloHolualoaHonaunauHonokaaHonoluluHonomuHoolehua
J
J B P H H
K
KaaawaKahukuKahuluiKailuaKailua KonaKalaheoKalaupapaKamuelaKaneoheKapaaKapaauKapoleiKaumakaniKaunakakaiKeaauKealakekuaKealiaKeauhouKekahaKiheiKilaueaKoloaKualapuuKulaKuniaKurtistown
L
LahainaLaieLanai CityLaupahoehoeLawaiLihue
M
M C B H Kaneohe BayMakawaoMakaweliMaunaloaMililaniMountain View
N
NaalehuNinole
O
Ocean ViewOokala
P
PaauiloPahalaPahoaPaiaPapaaloaPapaikouPearl CityPepeekeoPrincevillePukalaniPuunene
S
Schofield Barracks
T
Tripler Army Medical Center
V
Volcano
W
WahiawaWaialuaWaianaeWaikoloaWailukuWaimanaloWaimeaWaipahuWake IslandWheeler Army Airfield

🏆 Highest Rated ZIP Codes in Hawaii

96767Lahaina
95/100
A
96768Makawao
95/100
A
96790Kula
95/100
A
96748Kaunakakai
90/100
A
96728Honomu
88/100
A

⚠ Lowest Rated ZIP Codes in Hawaii

96712Haleiwa
55/100
C
96734Kailua
55/100
C
96746Kapaa
55/100
C
96792Waianae
55/100
C
96706Ewa Beach
60/100
C

Common Drinking Water Contaminants in Hawaii

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

Stage 2 DBP Rule

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 — Hawaii Drinking Water

Is tap water generally safe to drink in Hawaii?+
Yes, for the majority of residents, tap water in Hawaii is treated and regulated. However, compliance varies by city. State-wide, 65 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 Hawaii?+
Residents in Hawaii can test their tap or well water by contacting laboratories certified by Hawaii Department of 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 Hawaii?+
The primary issues include managing 1 health-based violations state-wide and resolving infrastructure age. 40.9% 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 Hawaii?+
Drinking water in Hawaii is regulated by Hawaii Department of Health under a primacy agreement with the U.S. EPA.
Where does Hawaii get its drinking water?+
Approximately 8.8% of monitored areas in Hawaii 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 Hawaii?+
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 137 ZIP Codes in Hawaii

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

9670196703967049670596706967079670896709967109671296713967149671596716967179671896719967209672196722967259672696727967289672996730967319673296733967349673796738967399674096741967429674396744967459674696747967489674996750967519675296753967549675596756967579675996760967619676296763967649676596766967679676896769967709677196772967739677496776967779677896779967809678196782967839678496785967869678896789967909679196792967939679596796967979680196802968039680496805968069680796808968099681096811968129681396814968159681696817968189681996820968219682296823968249682596826968289683096836968379683896839968409684196843968449684696847968489684996850968539685496857968589685996860968619686396898

All 137 ZIP codes in Hawaii are actively monitored under the EPA Safe Drinking Water Act.