STATE REPORT
HI
3 ALERTS
1 HEALTH VIOLATIONS
Hawaii Water Quality & Safety Report
28 ZIP codes · 51 water systems · UPC plumbing code · Updated 2026-03-16
Data: EPA SDWIS, NWS, State plumbing boards, Rewiring America Last verified: 2026-03-16
28
ZIP Codes
51
Water Systems
3
ZIPs with Violations
3
Active Alerts
UPC
Plumbing Code
Overview
We track water quality, weather alerts, plumbing regulations, and energy rebates for 28 ZIP codes across Hawaii, covering 51 community water systems that serve approximately 770,414 people.
3 of 28 ZIP codes (11%) have recorded EPA violations. 1 health-based violations have been documented.
Active Weather Alerts
3 active alerts in Hawaii including 1 warning. Severe weather can directly affect tap water quality — flooding, power outages, and infrastructure damage may lead to boil-water advisories.
| Alert | Severity | Areas |
|---|---|---|
| High Wind Warning | Severe | Haleakala Summit; Big Island Summit |
| Flood Watch | Severe | Kona; Kohala; Big Island Interior; Big Island South; Big … |
| Flood Watch | Severe | Lanai Mauka; Kahoolawe; Maui Windward West; Maui Leeward … |
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
Areas with Most Violations
| ZIP Code | City | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|---|
| 96744 | Kaneohe | — | 5 | 0 | MARINE CORPS BASE HAWAII |
| 96720 | Hilo | — | 3 | 0 | HILO |
| 96725 | Holualoa | — | 1 | 1 | KEOPU WATER ASSOCIATION |
Areas with No Violations
| ZIP Code | City | Safety Score | System | Population |
|---|---|---|---|---|
| 96701 | Aiea | — | KIPAPA ACRES C.P.R. | 43 |
| 96703 | Anahola | — | ANAHOLA | 2,473 |
| 96708 | Haiku | — | MAUNAOLU PLANTATION | 100 |
| 96713 | Hana | — | HANA | 1,284 |
| 96714 | Hanalei | — | HANALEI | 500 |
| 96718 | Hawaii National Park | — | HAWAII VOLCANOES NAT.PARK | 4,201 |
| 96722 | Princeville | — | PRINCEVILLE | 6,911 |
| 96728 | Honomu | — | HONOMU | 645 |
| 96729 | Hoolehua | — | HOOLEHUA | 2,400 |
| 96731 | Kahuku | — | KAHUKU | 2,730 |
Lead & Copper
- 0 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): 0 ZIP codes
All 28 ZIP Codes in Hawaii
- 96701 (Aiea)
- 96703 (Anahola)
- 96708 (Haiku)
- 96713 (Hana)
- 96714 (Hanalei)
- 96718 (Hawaii National Park)
- 96720 (Hilo) — 3 violations
- 96725 (Holualoa) — 1 violation ⚠
- 96801 (Honolulu)
- 96728 (Honomu)
- 96729 (Hoolehua)
- 96731 (Kahuku)
- 96732 (Kahului)
- 96740 (Kailua Kona)
- 96741 (Kalaheo)
- 96742 (Kalaupapa)
- 96743 (Kamuela)
- 96744 (Kaneohe) — 5 violations
- 96747 (Kaumakani)
- 96748 (Kaunakakai)
- 96751 (Kealia)
- 96752 (Kekaha)
- 96753 (Kihei)
- 96754 (Kilauea)
- 96756 (Koloa)
- 96761 (Lahaina)
- 96722 (Princeville)
- 96738 (Waikoloa)
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Weather alerts: National Weather Service (NWS)
- Regulations: State plumbing boards, ICC, IAPMO
- Rebates: Rewiring America
Updated daily.