County · Hawaii
Honolulu County, Hawaii: drinking water records
This overview covers 38 ZIP codes and 29 community water systems in Honolulu County. It also stands in for 0 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Hnl-Windward-Pearl Harbor HI0000331 | 631,389 | 2,760 | 1 | 0 | 0 ppb |
| Waipahu-Ewa-Waianae HI0000335 | 217,479 | 1,020 | 1 | 0 | 0 ppb |
| Joint Base Pearl Harbor-Hickam HI0000360 | 65,230 | 60 | 0 | 0 | 0 ppb |
| Mililani HI0000367 | 50,573 | 180 | 0 | 0 | 0 ppb |
| Schofield Barracks HI0000345 | 37,920 | 60 | 0 | 0 | 0 ppb |
| Wahiawa HI0000333 | 23,348 | 120 | 0 | 0 | 0 ppb |
| Marine Corps Base Hawaii HI0000356 | 16,300 | 60 | 0 | 0 | 0 ppb |
| Waipio Heights HI0000334 | 11,516 | 120 | 0 | 0 | 0 ppb |
| Waialua-Haleiwa HI0000332 | 9,996 | 60 | 0 | 0 | 0 ppb |
| Fort Shafter HI0000341 | 7,067 | 60 | 0 | 0 | 0 ppb |
| Nctams Eastpac HI0000357 | 6,470 | 60 | 0 | 0 | 0 ppb |
| Aliamanu HI0000337 | 6,406 | 60 | 0 | 0 | 0 ppb |
| Laie Water Company HI0000325 | 5,577 | 120 | 0 | 0 | 0 ppb |
| Tripler Army Medical Cntr HI0000346 | 5,555 | 60 | 0 | 0 | 0 ppb |
| Barbers Point HI0000355 | 5,256 | 60 | 0 | 0 | 0 ppb |
| Waialee-Sunset Beach HI0000366 | 4,916 | 180 | 0 | 0 | 0 ppb |
| Kamehameha Schools HI0000319 | 4,000 | 120 | 0 | 0 | 0 ppb |
| The Queen'S Medical Center HI0000312 | 3,440 | 60 | 0 | 0 | 0 ppb |
| Waiawa Correctional Facility HI0000348 | 444 | 0 | 0 | 5 | 0 ppb |
| Waiahole HI0000368 | 300 | 0 | 0 | 1 | 0 ppb |
| Kahuku HI0000365 | 2,730 | 0 | 0 | 0 | 0 ppb |
| Dillingham Airfield HI0000338 | 1,800 | 0 | 0 | 0 | 0 ppb |
| Kunia Village HI0000303 | 650 | 0 | 0 | 0 | 0 ppb |
| Camp Stover HI0000354 | 595 | 0 | 0 | 0 | 0 ppb |
| Waialua Sugar Pump 2 HI0000309 | 400 | 0 | 0 | 0 | 0 ppb |
ZIP reports in Honolulu County
No ZIP report in this county is published yet.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.