STATE REPORT HI

Hawaii Home Safety Profiles by ZIP

137 ZIP codes · 62 water systems · UPC plumbing code · Updated

Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData, NWS, State plumbing boards, Rewiring America

ZipCheckup tracks drinking-water and home-safety data for 137 ZIP codes across Hawaii, covering 62 public water systems that serve about 1,311,723 people. 9 ZIP codes carry at least one EPA violation on record.

137
ZIP Codes
62
Water Systems
9
ZIPs with Violations
UPC
Plumbing Code
A · 100
Avg Safety Score
#1
of 50 States
100%
ZIPs Rated A or B
12%
ZIPs with Violations
A
Hawaii average: 100/100 - ranked #1 of 50 states. 27 points above the national average (73). 100% 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.

52
A
0
B
0
C
0
D
0
F
85-10070-8455-6940-540-39

Home Safety Scores by State

Loading map…
F (0-39) D (40-54) C (55-69) B (70-84) A (85+)

Model 4.0.0 inputs: EPA SDWIS, UCMR5 PFAS, EPA radon zones, annual county AQI •

Top 10 Safest ZIP Codes in Hawaii

Highest Home Safety Scores in the state.

#ZIP CodeCityCountyScoreGrade
1 96701 AieaHonolulu 100 A
2 96706 Ewa BeachHonolulu 100 A
3 96707 KapoleiHonolulu 100 A
4 96708 HaikuMaui 100 A
5 96712 HaleiwaHonolulu 100 A
6 96717 HauulaHonolulu 100 A
7 96719 HawiHawaii 100 A
8 96720 HiloHawaii 100 A
9 96726 HonaunauHawaii 100 A
10 96727 HonokaaHonolulu 100 A

10 Lowest-Scoring ZIP Codes in Hawaii

#ZIP CodeCityCountyScoreGradeViolations
1 96729 HoolehuaMaui 97 A 2
2 96782 Pearl CityHonolulu 99 A 1
3 96750 KealakekuaHawaii 99 A 1
4 96740 Kailua KonaHawaii 99 A 1
5 96725 HolualoaHawaii 99 A 1
6 96863 M C B H Kaneohe BayHonolulu 100 A 0
7 96857 Schofield BarracksHonolulu 100 A 0
8 96826 HonoluluHonolulu 100 A 0
9 96825 HonoluluHonolulu 100 A 0
10 96822 HonoluluHonolulu 100 A 0

County Rankings

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

Loading county map…
F (0-39) D (40-54) C (55-69) B (70-84) A (85+)

County-level aggregation of measured ZIP Home Safety Scores • EPA SDWIS, UCMR 5 PFAS, EPA radon zones, EPA AirData

CountyAvg ScoreGradeZIPsBest ZIPWorst ZIP
15001 100 A 31 96719 (100) 96750 (99)
15003 100 A 70 96701 (100) 96782 (99)
15005 N/A N/A 1 N/A N/A
15007 N/A N/A 17 N/A N/A
15009 100 A 17 96708 (100) 96729 (97)

Most Common Contaminants in Hawaii

Contaminant / RuleCategoryZIPs AffectedViolationsHealth Risk
Stage 1 DBP Rule Treatment Technique 7 10 No
Barium Inorganic 1 1 No
Cadmium Inorganic 1 1 No
Chromium Inorganic 1 1 No
Fluoride Inorganic 1 1 No
Nitrite Inorganic 1 1 No
Contaminant 1036 Other 1 1 No
Contaminant 1045 Other 1 1 No

Overview

We track multi-source home safety signals for 137 ZIP records across Hawaii. Home Safety Score model 4.0.0 is published for 52 scored records; missing required evidence suppresses the score.

The EPA snapshots used for this build directly map water systems to 77 ZIP records, covering 62 community water systems that serve approximately 1,311,723 people.

9 of 77 ZIP codes with a reported violation count in the available EPA record (12%) have recorded EPA violations. The available record reports no health-based violations for this measured scope.

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 Home Safety Grade Violations Health-Based System
96763 Lanai City — 11 0 Lanai City
96729 Hoolehua A 2 0 Kipu
96757 Kualapuu — 2 0 Kipu
96770 Maunaloa — 2 0 Kipu
96725 Holualoa A 1 0 North Kona
96740 Kailua Kona A 1 0 North Kona
96743 Kamuela A 1 0 South Kohala
96750 Kealakekua A 1 0 South Kona
96782 Pearl City A 1 0 Hnl-windward-pearl Harbor

Areas with No Violations

ZIP Code City Home Safety Grade System Population
96701 Aiea A Hnl-windward-pearl Harbor 631,389
96703 Anahola — Anahola 2,473
96704 Captain Cook — South Kona 6,512
96705 Eleele — Kalaheo-koloa 12,660
96706 Ewa Beach A Waipahu-ewa-waianae 217,479
96707 Kapolei A Waipahu-ewa-waianae 217,479
96708 Haiku A Makawao 29,868
96710 Hakalau — Papaikou 2,203
96712 Haleiwa A Waialee-sunset Beach 4,916
96714 Hanalei — Haena-wainiha 833

Home Safety Score

Average Home Safety Score for Hawaii: A (100/100) across 52 scored of 137 tracked ZIP records.

Model 4.0.0 uses the canonical components water-compliance, pfas-mcl-screen, radon-zone, annual-aqi across 3 required domains. The sections below provide additional context and do not change that score. Missing required evidence suppresses the score, and a favorable result is not a property-level safety certification.

Lead & Copper

  • Average lead level (90th percentile): 0.0011 mg/L (EPA action level: 0.015 mg/L)
  • 0 of 77 ZIP codes with known status 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
96782 Pearl City 914,098 A 1
96797 Waipahu 860,384 A 0
96819 Honolulu 644,606 A 0
96817 Honolulu 631,984 A 0
96701 Aiea 631,389 A 0
96734 Kailua 631,389 A 0
96744 Kaneohe 631,389 A 0
96795 Waimanalo 631,389 A 0
96813 Honolulu 631,389 A 0
96814 Honolulu 631,389 A 0
96815 Honolulu 631,389 A 0
96816 Honolulu 631,389 A 0
96818 Honolulu 631,389 A 0
96821 Honolulu 631,389 A 0
96822 Honolulu 631,389 A 0
96825 Honolulu 631,389 A 0
96826 Honolulu 631,389 A 0
96848 Honolulu 631,389 — 0
96859 Tripler Army Medical Center 631,389 — 0
96860 J B P H H 631,389 — 0

Lowest Published Home Safety Scores

ZIP Code City Score Grade Violations
96729 Hoolehua 97 A 2
96725 Holualoa 99 A 1
96740 Kailua Kona 99 A 1
96750 Kealakekua 99 A 1
96782 Pearl City 99 A 1

Highest Published Home Safety Scores

ZIP Code City Score Grade Violations
96701 Aiea 100 A 0
96706 Ewa Beach 100 A 0
96707 Kapolei 100 A 0
96708 Haiku 100 A 0
96712 Haleiwa 100 A 0

All 137 ZIP Codes in Hawaii

Data Sources

Reporting periods vary by source. Missing data is shown as unavailable, not as zero.

Largest water systems in Hawaii

The 12 biggest community water systems serving Hawaii, of 62 total.

Show all 12 water systems

Systems with the most violations in Hawaii

5 systems in Hawaii with the most recorded EPA violations.

Frequently Asked Questions

Is the water safe to drink in Hawaii?

Hawaii has 62 community water systems serving 1,311,723 people across 137 ZIP codes. There are 16 recorded violations, including 0 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.

How to cite this page

APA ZipCheckup. (2026). Hawaii Home Safety Profiles by ZIP. https://zipcheckup.com/states/hawaii/
BibTeX 
@misc{zipcheckup-states-hawaii,
  author = {{ZipCheckup}},
  title  = {{Hawaii Home Safety Profiles by ZIP}},
  year   = {2026},
  url    = {https://zipcheckup.com/states/hawaii/}
}

Page version: August 2026.

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