COUNTY WATER-SYSTEM LEDGER
Honolulu, Hawaii
EPA’s September 2026 export lists 19 active community water systems serving Honolulu, Hawaii, with 2 current-violation flags and 0 serious-violator flags among the covered systems.
Source: EPA SDWIS system-search export · Active community systems serving 2,500+ people · Snapshot 13 Sep 2026
01 / SYSTEMS
Water systems serving Honolulu, Hawaii
EPA associates 19 covered systems with Honolulu, Hawaii; their reported population-served values total 1,115,168 and may overlap.
Ordered by reported population served. Open any record for separate health, monitoring, notice, other, and serious-violator flags.
| Water system | Population served | Primary source | Current export status |
|---|---|---|---|
| Hnl-Windward-Pearl HarborHI0000331 | 631,389 | Ground water | No current violation flagged |
| Waipahu-Ewa-WaianaeHI0000335 | 217,479 | Ground water | No current violation flagged |
| Joint Base Pearl Harbor-HickamHI0000360 | 65,230 | Ground water | Other current violation flag |
| MililaniHI0000367 | 50,573 | Ground water | No current violation flagged |
| Schofield BarracksHI0000345 | 37,920 | Ground water | No current violation flagged |
| WahiawaHI0000333 | 23,348 | Ground water | No current violation flagged |
| Marine Corps Base HawaiiHI0000356 | 16,300 | Ground water purchased | No current violation flagged |
| Waipio HeightsHI0000334 | 11,516 | Ground water | No current violation flagged |
| Waialua-HaleiwaHI0000332 | 9,996 | Ground water | No current violation flagged |
| Fort ShafterHI0000341 | 7,067 | Ground water | No current violation flagged |
| Nctams EastpacHI0000357 | 6,470 | Ground water | No current violation flagged |
| AliamanuHI0000337 | 6,406 | Ground water purchased | Other current violation flag |
| Laie Water CompanyHI0000325 | 5,577 | Ground water | No current violation flagged |
| Tripler Army Medical CntrHI0000346 | 5,555 | Ground water | No current violation flagged |
| Barbers PointHI0000355 | 5,256 | Ground water | No current violation flagged |
| Waialee-Sunset BeachHI0000366 | 4,916 | Ground water | No current violation flagged |
| Kamehameha SchoolsHI0000319 | 4,000 | Ground water | No current violation flagged |
| The Queen'S Medical CenterHI0000312 | 3,440 | Ground water | No current violation flagged |
| KahukuHI0000365 | 2,730 | Ground water | No current violation flagged |
02 / SOURCE MIX
Primary water sources for Honolulu, Hawaii
EPA classifies 19 systems serving Honolulu, Hawaii across 2 primary-source categories; Ground water is the largest category with 17 systems.
It is the sum of each listed system's reported population served, not a census estimate. Service areas can overlap and some systems list multiple cities or counties.