Hawaii Water Systems
118 community water systems in Hawaii, ranked by violation count. Data from EPA Safe Drinking Water Information System (SDWIS).
Hawaii community water systems are regulated by the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act; each utility files compliance results with the state's primacy agency and, for federally listed contaminants, with the U.S. Environmental Protection Agency directly. PlainEnviro's health-based SDWIS extract above counts health-based exceedances only -- monitoring and reporting violations are not present in these figures.
Violation counts reflect both infrastructure realities and reporting diligence, a state with more small rural systems will accumulate more monitoring-type violations without necessarily delivering worse water. Health-based violations are the stronger safety signal. A past violation does not itself indicate current unsafe water; utilities must notify customers, remediate, and publish an annual Consumer Confidence Report. All numbers below draw directly from the federal SDWIS record.
Which water systems have violations? (16)
| # | System Name | Violations | Health |
|---|---|---|---|
| 1 | MOLOAA IRRIGATION COOPERATIVE Anahola | 10 | Yes |
| 2 | WAIAWA CORRECTIONAL FACILITY Pearl City | 5 | Yes |
| 3 | KEOPU WATER ASSOCIATION Holualoa | 2 | Yes |
| 4 | VILLA ROSE Wailuku | 2 | Yes |
| 5 | HILO Hilo | 1 | Yes |
| 6 | MAKAWAO Wailuku | 1 | Yes |
| 7 | LAHAINA Wailuku | 1 | Yes |
| 8 | LOWER KULA Wailuku | 1 | Yes |
| 9 | PAHALA Hilo | 1 | Yes |
| 10 | MAUNALOA-KALUAKOI Maunaloa | 1 | Yes |
| 11 | KUKUIHAELE Hilo | 1 | Yes |
| 12 | WAIAHOLE Honolulu | 1 | Yes |
| 13 | KAHAKULOA WATER CO. Wailuku | 1 | Yes |
| 14 | SHASTA CASCADE MOBILEHOME PARK Honolulu | 1 | Yes |
| 15 | KAILUA Puunene | 1 | Yes |
| 16 | PEPEEKEO WATER ASSOCIATION Hilo | 1 | Yes |
Systems with No Violations (102)
102 water systems in Hawaii have zero recorded violations. Showing the 50 largest by population served.
All Water Systems in Hawaii (118)
Page 3 of 3, ordered by population served.
| System | Population Served | Violations |
|---|---|---|
| SHASTA CASCADE MOBILEHOME PARK | 100 | 1 |
| OLOWALU | 100 | 0 |
| MAUNAOLU PLANTATION | 100 | 0 |
| MOLOAA IRRIGATION COOPERATIVE | 100 | 10 |
| KAILUA | 90 | 1 |
| KIPU | 80 | 0 |
| KULA NANI | 80 | 0 |
| WOOD VALLEY | 75 | 0 |
| KAHUKU AIR BASE | 75 | 0 |
| PEPEEKEO WATER ASSOCIATION | 60 | 1 |
| WEST KUIAHA MEADOWS | 60 | 0 |
| WOODLANDS AT NUUANU | 48 | 0 |
| HONOKOHAU | 42 | 0 |
| BALDWIN RANCH ESTATES | 32 | 0 |
| VILLA ROSE | 30 | 2 |
| MAUI HIGHLANDS | 26 | 0 |
| POAMOHO | 25 | 0 |
| HAIKU TOWN WATER ASSOCIATION, INC. | 20 | 0 |
Frequently Asked Questions
How many water systems are in Hawaii?
How many water systems in Hawaii have health violations?
How many health-based violation records are in this extract for Hawaii?
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About This Data
Water system data is from the EPA Safe Drinking Water Information System (SDWIS). Health-based violations include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations that may pose a direct risk to public health. Only community water systems (CWS) are included.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.