Honolulu Water Quality
Hawaii
The tap water in Honolulu, Hawaii is served by 16 EPA-regulated water systems covering approximately 961,860 people. 2 health-based violations are on record, most recently for 5200 in 2024. Data source: EPA Safe Drinking Water Information System.
Drinking water in Honolulu, Hawaii is delivered through 16 EPA-regulated community water systems serving an estimated 961,860 people. Each system is tracked in the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act, which requires testing for regulated contaminants, consumer notification of violations, and publication of an annual Consumer Confidence Report.
The SDWIS record for Honolulu shows 2 total violations across all 16 systems, of which 2 are health-based, meaning either a Maximum Contaminant Level (MCL) was exceeded or a required treatment technique was not followed. Contaminants cited in health-based violations include 5200, 8000. 5 TRI-reporting industrial facilities are also located within the city limits.
A past EPA violation does not mean the water is currently unsafe, utilities are required to notify customers and remediate under state primacy oversight. For current water-quality status and treatment practices, review your local utility's most recent Consumer Confidence Report or contact the Hawaii drinking water program. All records above reflect federal EPA SDWIS data and are not independently verified against state databases.
Community Water Systems
| System Name | Pop. Served | Violations | Status |
|---|---|---|---|
| HNL-WINDWARD-PEARL HARBOR | 631,389 | 0 | Clean |
| WAIPAHU-EWA-WAIANAE | 217,479 | 0 | Clean |
| MILILANI | 50,573 | 0 | Clean |
| WAHIAWA | 23,348 | 0 | Clean |
| WAIPIO HEIGHTS | 11,516 | 0 | Clean |
| WAIALUA-HALEIWA | 9,996 | 0 | Clean |
| WAIALEE-SUNSET BEACH | 4,916 | 0 | Clean |
| KAMEHAMEHA SCHOOLS | 4,000 | 0 | Clean |
| THE QUEEN'S MEDICAL CENTER | 3,440 | 0 | Clean |
| KAHUKU | 2,730 | 0 | Clean |
| DILLINGHAM AIRFIELD | 1,800 | 0 | Clean |
| WAIAHOLE | 300 | 1 | Health |
| PUNALU'U | 200 | 0 | Clean |
| SHASTA CASCADE MOBILEHOME PARK | 100 | 1 | Health |
| WOODLANDS AT NUUANU | 48 | 0 | Clean |
| POAMOHO | 25 | 0 | Clean |
Does this city have health-based water violations?
Health-based violations indicate contaminant levels that exceeded EPA maximum contaminant levels (MCLs). This does not necessarily mean water is currently unsafe.
| Contaminant | Begin Date |
|---|---|
| 5200 | 2024-10-17 |
| 8000 | 2020-01-01 |
TRI Facilities in Honolulu
| Facility | Total Releases |
|---|---|
| Hffc Sand Island Fuel Terminal | 27.0K lbs |
| Hffc Airport Fuel Farm | 14.5K lbs |
| Aloha Petroleum Honolulu Terminal | 13.2K lbs |
| Ies Downstream LLC - Honolulu Terminal Marine | 10.2K lbs |
| Ies Downstream LLC - Honolulu Terminal Transportation | 1.1K lbs |
Frequently Asked Questions
Is Honolulu, Hawaii water safe to drink? ▼
How many water violations does Honolulu have? ▼
What contaminants were found in Honolulu water? ▼
How many water systems serve Honolulu? ▼
Where does Honolulu get its drinking water? ▼
Are there pollution sources near Honolulu? ▼
About This Data
Water system data comes from the EPA's Safe Drinking Water Information System (SDWIS). Violations are reported by state agencies to EPA and include both health-based (MCL exceedances) and monitoring/reporting violations.
A reported violation does not necessarily mean water is currently unsafe to drink. Many violations are resolved quickly, and public water systems are required to notify customers of significant issues. For current water quality, contact your local water utility.
TRI facility data comes from the EPA Toxic Release Inventory. Facilities shown are those that self-report to the TRI program. PlainEnviro presents this data without advocacy framing.
Read our methodology - how this data is sourced, computed, and verified.