Water quality in Downtown Honolulu, Hawaii
Downtown Honolulu is in Honolulu County. 38 active public water systems serve the county; 6 had an EPA violation in the past three years.
Most likely your provider
Other community water systems in Honolulu County
29 systems, largest first| System | Serves | Status | Rules violated, 3 yr |
|---|---|---|---|
| Waipahu-Ewa-Waianae Waipahu-ewa-waianae |
217,479 | 0 | |
| Joint Base Pearl Harbor-Hickam Pearl Harbor |
65,230 | 1 | |
| Mililani Mililani Bws |
50,573 | 0 | |
| Schofield Barracks |
37,920 | 0 | |
| Wahiawa |
23,348 | 0 | |
| Marine Corps Base Hawaii Kaneohe |
16,300 | 1 | |
| Waipio Heights Waipio |
11,516 | 0 | |
| Waialua-Haleiwa Waialua-haleiwa |
9,996 | 0 | |
| Fort Shafter |
7,067 | 0 | |
| Nctams Eastpac Wahiawa |
6,470 | 0 | |
| Aliamanu Salt Lake |
6,406 | 1 | |
| Laie Water Company Laie |
5,577 | 0 | |
| Tripler Army Medical Cntr Moanalua |
5,555 | 0 | |
| Barbers Point Waipahu-ewa-waianae |
5,256 | 0 | |
| Waialee-Sunset Beach Sunset Beach |
4,916 | 0 | |
| Kamehameha Schools Kapalama |
4,000 | 0 | |
| The Queen's Medical Center Downtown Honolulu |
3,440 | 0 | |
| Kahuku Kahuku |
2,730 | 0 | |
| Dillingham Airfield Mokuleia |
1,800 | 0 | |
| Kunia Village Wahiawa |
650 | 0 | |
| Camp Stover Wahiawa |
595 | 0 | |
| Waiawa Correctional Facility Waipahu |
444 | 0 | |
| Waialua Sugar Pump 2 Waialua-haleiwa |
400 | 0 | |
| Waiahole Kahana Valley |
300 | 0 | |
| Dillingham Ranch Waialua-haleiwa |
100 | 0 |
Non-community systems in Honolulu County (8: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Punahou School Manoa |
4,000 | 0 | 0 | |
|
Sheraton Hotels |
2,830 | 1 | 0 | |
|
The Queen's Medical Center West Oahu Kunia |
800 | 0 | 0 | |
|
Waimano Ridge Pearlridge |
545 | 0 | 0 | |
|
Navmag Lualualei Waianae |
114 | 0 | 0 | |
|
Mililani Memorial Park Mililani Bws |
100 | 0 | 0 | |
|
Palehua Solar Observatory Makakilo |
50 | 0 | 0 | |
|
ST Stephen's Diocesan Ctr Kaneohe |
45 | 1 | 0 |
About this data
Water systems are matched to Honolulu County, largest first. Your exact provider depends on your address and connection; the largest community water system in a county is usually the city or town utility.
Town locations and ZIP code areas come from U.S. Census Bureau 2020 files.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Hawaii records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet.