Honolulu Water Quality
Hawaii
According to EPA SDWIS, Honolulu, Hawaii is served by 16 community water systems covering about 961,860 people. The same extract lists 2 health-based violation records, most recently coded 5200 in 2024. Counts are historical EPA registry rows, not a current compliance or drinkability score.
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.
PlainEnviro's health-based SDWIS extract shows 2 violation records across the 16 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 2 distinct EPA contaminant codes: LEAD AND COPPER RULE REVISIONS, Revised Total Coliform Rule. 5 TRI-reporting industrial facilities are also located within the city limits.
A past EPA health-based registry row does not describe water delivered today or current compliance status; utilities notify customers and remediate under state primacy oversight when required. 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?
These health-based records can represent Maximum Contaminant Level (MCL), Treatment Technique (TT), or Maximum Residual Disinfectant Level (MRDL) categories. A historical record does not establish that water is currently unsafe.
| Water system | Contaminant | Begin Date |
|---|---|---|
| SHASTA CASCADE MOBILEHOME PARK | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| WAIAHOLE | Revised Total Coliform Rule | 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
What does EPA SDWIS list for drinking water in Honolulu, Hawaii? ▼
How many water violations does Honolulu have in this EPA extract? ▼
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? ▼
How does Honolulu compare in Hawaii?
Of the 33 Hawaii places with at least one community water system on file, Honolulu ranks #3 by number of systems (16).
Either side of it: Hilo (24), Wailuku (18), Lihue (10), Jbpph (4)
About This Data
Figures here are the current EPA SDWIS extract joined to the 16 community water systems whose service area lists Honolulu, ranked against the 33 Hawaii places with at least one system on file. Data current as of 2026-08-10.
Water system data comes from the EPA's Safe Drinking Water Information System (SDWIS). PlainEnviro's violation fetch is restricted upstream to records EPA flags as health-based and then joined to active community water systems. Monitoring and reporting violations are not included.
A health-based violation row in this extract is a historical EPA registry entry. It does not describe water delivered today or current compliance status. Many records are later resolved, and public water systems notify customers when required. For current conditions, contact your local water utility or the state drinking water program.
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.