Hawaii Water Systems

Hawaii public water system directory

This directory lists the public water system profiles currently available for Hawaii. It is not a complete statewide inventory, and it is not an address-level service lookup.

Compare Systems

3 available Hawaii system records

Compare the PWSID, linked community, source-water context, and report year currently available for each Hawaii record.

All systems are shown.

PWSIDSystemCitiesCountiesSource waterViolation records shownLatest CCR
HI0000331HNL-WINDWARD-PEARL HARBORHonoluluNot verifiedGroundwater from Kalauao Wells, Kalihi Shaft, and Punanani Wells for the address represented by Board of Water Supply report 11043No violation records shown in available records2026
HI0000101HILOHiloNot verifiedGroundwater from Panaewa wells, Piihonua wells, Saddle Road Well A, and UH Hilo Well, as listed in the 2025 reportNo violation records shown in available records2025
HI0000212WAILUKUKahuluiNot verifiedApproximately 92% groundwater and 8% surface water in 2025, including Central Maui wells and tunnel sources plus surface water treated at Iao Treatment PlantNo violation records shown in available records2025
PWSIDHI0000331
SystemHNL-WINDWARD-PEARL HARBOR
CitiesHonolulu
CountiesNot verified
Source waterGroundwater from Kalauao Wells, Kalihi Shaft, and Punanani Wells for the address represented by Board of Water Supply report 11043
Violation records shownNo violation records shown in available records
Latest CCR2026
PWSIDHI0000101
SystemHILO
CitiesHilo
CountiesNot verified
Source waterGroundwater from Panaewa wells, Piihonua wells, Saddle Road Well A, and UH Hilo Well, as listed in the 2025 report
Violation records shownNo violation records shown in available records
Latest CCR2025
PWSIDHI0000212
SystemWAILUKU
CitiesKahului
CountiesNot verified
Source waterApproximately 92% groundwater and 8% surface water in 2025, including Central Maui wells and tunnel sources plus surface water treated at Iao Treatment Plant
Violation records shownNo violation records shown in available records
Latest CCR2025

Profiles

Open a Hawaii public water system profile

Each of these 3 profiles keeps its source links, annual-report details, limitations, and summarized CCR entries together.

Last updated: EPA data

HNL-WINDWARD-PEARL HARBOR

PWSID HI0000331

View system profile

System-level profile for Honolulu. Use it to review report-year context, source links, available violation records, contaminant relationships, and limitations.

System type
Communities
Honolulu
Counties
County not listed
Latest CCR
2026
Last updated: EPA data

HILO

PWSID HI0000101

View system profile

System-level profile for Hilo. Use it to review report-year context, source links, available violation records, contaminant relationships, and limitations.

System type
Communities
Hilo
Counties
County not listed
Latest CCR
2025
Last updated: EPA data

WAILUKU

PWSID HI0000212

View system profile

System-level profile for Kahului. Use it to review report-year context, source links, available violation records, contaminant relationships, and limitations.

System type
Communities
Kahului
Counties
County not listed
Latest CCR
2025