STATE REPORT HI 1 HEALTH VIOLATIONS

Hawaii Water Quality: 16 Violations in 137 ZIP Codes

137 ZIP codes · 89 water systems · UPC plumbing code · Updated 2026-07-19

Data: EPA SDWIS, NWS, State plumbing boards, Rewiring America Last verified: 2026-07-19

ZipCheckup tracks drinking-water and home-safety data for 137 ZIP codes across Hawaii, covering 89 public water systems that serve about 1,274,618 people. 9 ZIP codes carry at least one EPA violation on record.

137
ZIP Codes
89
Water Systems
9
ZIPs with Violations
UPC
Plumbing Code
B · 79
Avg Safety Score
3
ZIPs Exceeding Lead Limit
#5
of 51 States
77%
ZIPs Rated A or B
7%
ZIPs with Violations
B
Hawaii average: 79/100 - ranked #5 of 51 states. 12 points above the national average (67). 77% of ZIP codes scored A or B.

Throughout Hawaii, public water systems report above-baseline compliance with federal drinking water standards - violations exist but are isolated rather than systemic.

Score Distribution

How Hawaii's 137 ZIP codes are distributed across safety grades.

65
A
41
B
31
C
0
D
0
F
85-10070-8455-6940-540-39

Home Safety Scores by State

Loading map…
F (0-49) D (50-64) C (65-74) B (75-84) A (85+)

Data: EPA SDWIS, FEMA NFIP, EPA Radon, USGS Earthquake Hazards, NIFC Wildfire • 2026-07-19

Top 10 Safest ZIP Codes in Hawaii

Highest Home Safety Scores in the state.

#ZIP CodeCityCountyScoreGrade
1 96767 LahainaMaui 95 A
2 96768 MakawaoHonolulu 95 A
3 96790 KulaMaui 95 A
4 96748 KaunakakaiMaui 90 A
5 96728 HonomuHawaii 88 A
6 96729 HoolehuaMaui 88 A
7 96751 KealiaKauai 88 A
8 96759 KuniaHonolulu 88 A
9 96764 LaupahoehoeHawaii 88 A
10 96773 NinoleHawaii 88 A

10 Lowest-Scoring ZIP Codes in Hawaii

#ZIP CodeCityCountyScoreGradeViolations
1 96792 WaianaeHonolulu 55 C 0
2 96746 KapaaKauai 55 C 0
3 96734 KailuaHonolulu 55 C 0
4 96712 HaleiwaHonolulu 55 C 0
5 96791 WaialuaHonolulu 60 C 0
6 96730 KaaawaHonolulu 60 C 0
7 96717 HauulaHonolulu 60 C 0
8 96706 Ewa BeachHonolulu 60 C 0
9 96796 WaimeaKauai 65 C 0
10 96795 WaimanaloHawaii 65 C 0

County Rankings

Water quality breakdown by county. 5 counties with data in Hawaii.

Loading county map…
F (0-49) D (50-64) C (65-74) B (75-84) A (85+)

County-level aggregation of ZIP code safety scores • EPA SDWIS, FEMA NFIP, EPA Radon, USGS, NIFC

CountyAvg ScoreGradeZIPsBest ZIPWorst ZIP
Honolulu 80 B 66 96768 (95) 96792 (55)
Kauai 74 B 18 96751 (88) 96746 (55)
Hawaii 76 B 35 96728 (88) 96795 (65)
Maui 82 B 17 96767 (95) 96732 (65)
Kalawao 86 A 1 96742 (86) 96742 (86)

Most Common Contaminants in Hawaii

Contaminant / RuleCategoryZIPs AffectedViolationsHealth Risk
Stage 1 DBP Rule Treatment Technique 7 11 No
Fecal Coliform Microbiological 2 2 No
Stage 2 DBP Rule Treatment Technique 1 1 Yes
Surface Water Treatment Rule Treatment Technique 1 1 No
Lead and Copper Rule Treatment Technique 1 1 No

Overview

We track water quality, weather alerts, plumbing regulations, and energy rebates for 137 ZIP codes across Hawaii, covering 89 community water systems that serve approximately 1,274,618 people.

9 of 137 ZIP codes (7%) have recorded EPA violations. 1 health-based violations have been documented.

Plumbing Regulations

Hawaii follows the Uniform Plumbing Code (2018 edition).

  • Plumbing code: UPC (2018)
  • Homeowner DIY: Licensed plumber required
  • Water heater permit: Required
  • Annual backflow test: Required
  • Seismic strapping: Required

Full Hawaii regulations →

Areas with Most Violations

ZIP Code City Safety Score Violations Health-Based System
96770 Maunaloa B 4 0 Kipu
96744 Kaneohe B 3 0 HNL-WINDWARD-PEARL HARBOR
96720 Hilo B 2 0 Hilo
96721 Hilo A 2 0 Hilo
96725 Holualoa A 1 1 North Kona
96742 Kalaupapa A 1 0 Kalaupapa Nhp
96757 Kualapuu A 1 0 Kipu
96763 Lanai City A 1 0 Lanai City
96857 Schofield Barracks A 1 0 Schofield Barracks

Areas with No Violations

ZIP Code City Safety Score System Population
96701 Aiea B HNL-WINDWARD-PEARL HARBOR 631,389
96703 Anahola B Anahola 2,473
96704 Captain Cook B South Kona 6,512
96705 Eleele C Kalaheo-koloa 12,660
96706 Ewa Beach C Waipahu-ewa-waianae 217,479
96707 Kapolei B Waipahu-ewa-waianae 217,479
96708 Haiku B West Kuiaha Meadows 60
96709 Kapolei C WAIAWA CORRECTIONAL FACILITY 444
96710 Hakalau C HONOMU 645
96712 Haleiwa C KAHUKU 2,730

Home Safety Score

Average Home Safety Score for Hawaii: B (79/100)

Lead & Copper

  • Average lead level (90th percentile): 0.0072 mg/L (EPA action level: 0.015 mg/L)
  • 3 ZIP codes exceed the EPA lead action level

Radon Risk

  • High risk (Zone 1): 0 ZIP codes (0%)
  • Moderate risk (Zone 2): 0 ZIP codes
  • Low risk (Zone 3): 137 ZIP codes

ZIP Code Reports for Hawaii

Largest Communities

ZIP Code City Population Safety Grade Violations
96819 Honolulu 947,522 B 0
96817 Honolulu 934,900 B 0
96801 Honolulu 934,305 A 0
96802 Honolulu 934,305 A 0
96803 Honolulu 934,305 A 0
96804 Honolulu 934,305 A 0
96805 Honolulu 934,305 A 0
96806 Honolulu 934,305 A 0
96807 Honolulu 934,305 A 0
96808 Honolulu 934,305 A 0
96809 Honolulu 934,305 A 0
96810 Honolulu 934,305 A 0
96811 Honolulu 934,305 A 0
96812 Honolulu 934,305 A 0
96813 Honolulu 934,305 B 0
96814 Honolulu 934,305 A 0
96815 Honolulu 934,305 B 0
96816 Honolulu 934,305 B 0
96818 Honolulu 934,305 A 0
96820 Honolulu 934,305 A 0

Lowest Safety Scores

ZIP Code City Score Grade Violations
96712 Haleiwa 55 C 0
96734 Kailua 55 C 0
96746 Kapaa 55 C 0
96792 Waianae 55 C 0
96706 Ewa Beach 60 C 0

Highest Safety Scores

ZIP Code City Score Grade Violations
96767 Lahaina 95 A 0
96768 Makawao 95 A 0
96790 Kula 95 A 0
96748 Kaunakakai 90 A 0
96728 Honomu 88 A 0

All 137 ZIP Codes in Hawaii

Data Sources

Updated daily.

Largest water systems in Hawaii

The 12 biggest community water systems serving Hawaii, of 89 total.

Show all 12 water systems

Systems with the most violations in Hawaii

7 systems in Hawaii with the most recorded EPA violations.

Frequently Asked Questions

Is the water safe to drink in Hawaii?

Hawaii has 89 community water systems serving 1,274,618 people across 137 ZIP codes. There are 16 recorded violations, including 1 health-based. 9 of 137 ZIP codes have at least one violation.

What plumbing code does Hawaii follow?

Hawaii follows the UPC plumbing code. A licensed plumber is generally required for plumbing work.

Is lead a concern in Hawaii's drinking water?

3 ZIP codes in Hawaii have lead levels exceeding the EPA action level of 0.015 mg/L.

How to cite this page

APA ZipCheckup. (2026). Hawaii Water Quality: 16 Violations in 137 ZIP Codes. https://zipcheckup.com/states/hawaii/
BibTeX 
@misc{zipcheckup-states-hawaii,
  author = {{ZipCheckup}},
  title  = {{Hawaii Water Quality: 16 Violations in 137 ZIP Codes}},
  year   = {2026},
  url    = {https://zipcheckup.com/states/hawaii/}
}

Data as of July 2026.

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